CN101384070A - Mobile terminal positioning method, device and system - Google Patents

Abstract

The invention discloses a movable termination locating method, a movable termination locating device and a movable termination locating system, which are used for realizing that the flux of an air interface is not needed when a movable termination is located and enabling the movable termination to accurately locate the self position relatively. The movable termination locating method comprises the following steps: base station location information broadcasted by at least two base stations is respectively gained; the distance between the movable termination and each base station of the two base stations is respectively confirmed; and the movable termination location information is confirmed according to the location information of each base station of the two base stations and the distance between the movable termination and each base station. The movable termination locating device comprises a base station location information gaining unit, a distance confirming unit and a movable termination location information confirming unit. The movable termination locating system comprises at least two base stations and a movable termination.

Description

A kind of mobile terminal locating method, Apparatus and system

Technical field

The present invention relates to the mobile communication technology field, particularly the portable terminal location technology.

Background technology

The portable terminal positioning service is important business in the radio honeycomb communication system, the location technology of portable terminal mainly contains following several in the third generation wireless communication system: single base station intelligent antenna location, CELL_ID (Cell Identifier, cell localization), OTDOA (Observe Time Difference OfArrival, the observation arrival time is poor) and A-GPS (Assisted Global Positioning System, agps system).

In single base station intelligent antenna location technology, the base station obtains the azimuth information that portable terminal transmits by smart antenna, and the deviation between the timing advance of while mobile terminal reporting and the reception regularly that the base station reports multiply by the light velocity has represented that portable terminal is with the distance between the base station.RNC just can calculate the position of portable terminal according to above-mentioned azimuth information, the portable terminal geographical location information with range information between the base station and base station.At present, TD-SCDMA (Time Division Duplex-Synchronous Code DivisionMultiple Access, Time Division-Synchronous Code Division Multiple Access) system has realized the localization method of single base station intelligent antenna.But the precision of single base station intelligent antenna localization method depends on the azimuth resolution precision of smart antenna, when in the urban district, when mountain area, hilly country, the wireless propagation environment complexity, there is not direct signal, and there is the suitable multipath signal of several energy, smart antenna forms an azimuth at the strong multipath signal of each energy, and final azimuth is to carry out balance in these azimuths.As seen, this final azimuth is difficult to point to accurately the orientation at portable terminal place, and the path distance of each reflection multipath signal is not equal to portable terminal with the actual range between the base station.Therefore under the radio transmission complicated situation, this single base station intelligent antenna localization method precision is very poor.

The CELL_ID localization method is according to portable terminal residing sub-district or Base Station Identification mobile terminal locations in network.Portable terminal might be in the sub-district any position, so the CELL_ID positioning accuracy depends on the size of sub-district fully.In the most of zone except that dense city, the radius of society of radio honeycomb communication system is generally all more than 1km, particularly suburb and rural area even reach tens kilometers, this moment, the CELL_ID locating accuracy can not be better than 500m, and such precision can not satisfy most of user's requirement far away.Though some improved technology on the basis of CELL_ID localization method, occurred, improve DeGrain, still there is big deviations.

The basic functional principle of OTDOA localization method is: the time difference of the arrival portable terminal of at least 3 CBCHs of portable terminal observation, to the time difference feed back to network side, network side adopts hyperboloid/line algorithm to come portable terminal is positioned according to this time difference.If the acquiescence portable terminal on same horizontal plane, adopts the hyperbola algorithm that portable terminal is positioned with each base station, the height to portable terminal does not position; If can not give tacit consent to portable terminal with each base station on same horizontal plane, just take the hyperboloid algorithm that portable terminal is positioned.The OTDOA localization method need be changed portable terminal and make it support OTDOA to measure, and need expand the air interface function.

The basic principle of A-GPS localization method is: network provides assistant GPS (GlobalPositioning System to portable terminal, global positioning system) information, (for example GPS catches supplementary to comprise the supplementary of GPS pseudo range measurement, the GPS positioning auxiliary information, GPS sensitivity supplementary, gps satellite working condition information etc.) and the supplementary calculated of portable terminal (GPS almanac and revise data for example, the GPS ephemeris, gps navigation message etc.), utilize these information, portable terminal can be caught satellite very soon and be received metrical information, then metrical information is sent to the positioning service center in the network, go out portable terminal present located position by the positioning service center calculation.This position calculation reduces the GPS reception implementation complexity of portable terminal greatly, and can reduce power consumption.But because the A-GPS localization method needs network and portable terminal can both receive GPS information, therefore need do bigger change, need expand the air interface function to portable terminal and network.

As fully visible, when adopting above-mentioned existing portable terminal location technology localisation of mobile terminals, positioning accuracy is relatively poor, perhaps also needs network and portable terminal are carried out bigger change, need the function of air interface be expanded, and implementation procedure is more loaded down with trivial details.

Summary of the invention

The embodiment of the invention provides mobile terminal locating method, Apparatus and system, under the situation that is implemented in the flow that does not need to increase air interface, makes portable terminal can comparatively accurately locate the position of oneself.

A kind of mobile terminal locating method that the embodiment of the invention provides may further comprise the steps:

Obtain the base station position information that broadcast separately at least two base stations respectively;

Determine the distance between each base station in portable terminal and described at least two base stations respectively;

Determine location information of mobile terminal according to the positional information of each base station in described at least two base stations and the distance between portable terminal and each base station.

Distance between described portable terminal and the base station is: 1/2nd of the upward signal transmitting time lead of each ascending time slot of determining and light velocity product set up in the uplink synchronous process in portable terminal and base station.

When determining described location information of mobile terminal, when base station position information comprises latitude and longitude information, then determine portable terminal corresponding reference latitude and longitude information respectively according to the latitude and longitude information of per two base stations in described at least two base stations, again with all with reference to the mean value of the mean value of longitude information and reference latitude information as the final latitude and longitude information of portable terminal; Wherein a kind of definite method is to utilize following equation to determine portable terminal corresponding reference latitude and longitude information according to the latitude and longitude information of per two base stations:

$\sqrt{{(x-x1)}^2+{(y-y1)}^2}=L1$

$\sqrt{{(x-x2)}^2+{(y-y2)}^2}=L2$

Described L1 is that latitude and longitude information is (x1 in portable terminal and described per two base stations, y1) distance between the base station, described L2 is that latitude and longitude information is (x2 in portable terminal and described per two base stations, y2) distance between the base station, it is described that (x y) is portable terminal corresponding reference latitude and longitude information.

When determining described location information of mobile terminal, when base station position information comprises latitude and longitude information and described at least two base stations is three or three above base stations, then determine portable terminal corresponding reference latitude and longitude information respectively according to the latitude and longitude information of per three base stations, again with all with reference to the mean value of the mean value of longitude information and reference latitude information as the final latitude and longitude information of portable terminal; Wherein a kind of definite method is a hyperbola positioning method.

When determining described location information of mobile terminal, when described base station position information comprises latitude and longitude information and elevation information and described at least two base stations is three or three above base stations, then determine portable terminal corresponding reference latitude and longitude information and elevation information respectively according to the latitude and longitude information of per three base stations and elevation information, again with the mean value of the mean value of all mean values, reference latitude information and reference altitude information with reference to longitude information as portable terminal final latitude and longitude information and elevation information; Wherein a kind of definite orientation is to utilize following equation to determine portable terminal corresponding reference latitude and longitude information and elevation information according to the latitude and longitude information and the elevation information of per three base stations:

$\sqrt{{(x-x1)}^2+{(y-y1)}^2+{(z-z1)}^2}=L1$

$\sqrt{{(x-x2)}^2+{(y-y2)}^2+{(z-z2)}^2}=L2$

$\sqrt{{(x-x3)}^2+{(y-y3)}^2+{(z-z3)}^2}=L3$

Described L1 is that latitude and longitude information and elevation information are (x1 in portable terminal and described per three base stations, y1, z1) distance between the base station, described L2 is that latitude and longitude information and elevation information are (x2 in portable terminal and described per three base stations, y2, z2) distance between the base station, described L3 is that latitude and longitude information and elevation information are (x3 in portable terminal and described per three base stations, y3, z3) distance between the base station, it is described that (x, y z) are portable terminal corresponding reference latitude and longitude information and elevation information.

When determining described location information of mobile terminal, when described base station position information comprises that latitude and longitude information and elevation information and described at least three base stations are four or more base station, then determine portable terminal corresponding reference latitude and longitude information and elevation information respectively according to the latitude and longitude information of per four base stations and elevation information, again with the mean value of the mean value of all mean values, reference latitude information and reference altitude information with reference to longitude information as portable terminal final latitude and longitude information and elevation information; Wherein a kind of definite method is the hyperboloid localization method.

A kind of portable terminal positioner that the embodiment of the invention provides comprises:

The base station position information acquiring unit is used for obtaining respectively the positional information that broadcast separately at least two base stations;

Distance determining unit is used for the distance between definite respectively portable terminal and each base station, described at least two base stations;

The location information of mobile terminal determining unit is used for the positional information of each base station, described at least two base stations of obtaining according to described base station position information acquiring unit and described portable terminal and the distance between each base station that distance determining unit is determined and further determines location information of mobile terminal.

Portable terminal and the distance between the base station that described distance determining unit is determined are: 1/2nd of the upward signal transmitting time lead of each definite in uplink synchronous process ascending time slot and light velocity product set up in portable terminal and base station.

When described base station position information acquiring unit has obtained the latitude and longitude information of broadcasting separately at least two base stations respectively, the latitude and longitude information of per two base stations is determined portable terminal corresponding reference latitude and longitude information respectively in described at least two base stations that described location information of mobile terminal determining unit is obtained according to described base station position information acquiring unit, again with all with reference to the mean value of the mean value of longitude information and reference latitude information as the final latitude and longitude information of portable terminal.

When described base station position information acquiring unit has obtained at least two latitude and longitude information and elevation informations that broadcast separately the base station respectively, and when described at least two base stations are the above base station of three or three, described location information of mobile terminal determining unit is determined portable terminal corresponding reference latitude and longitude information and elevation information respectively according to the latitude and longitude information and the elevation information of per three base stations that described base station position information acquiring unit obtains, again with all mean value with reference to longitude information, the mean value of the mean value of reference latitude information and reference altitude information is as portable terminal final latitude and longitude information and elevation information.

A kind of portable terminal that the embodiment of the invention provides comprises:

The base station position information acquiring unit is used for obtaining respectively the positional information that broadcast separately at least two base stations;

Distance determining unit is used for the distance between definite respectively portable terminal and each base station, described at least two base stations;

The location information of mobile terminal determining unit is used for the positional information of each base station, described at least two base stations of obtaining according to described base station position information acquiring unit and described portable terminal and the distance between each base station that distance determining unit is determined and further determines location information of mobile terminal.

Portable terminal and the distance between the base station that described distance determining unit is determined are: 1/2nd of the upward signal transmitting time lead of each definite in uplink synchronous process ascending time slot and light velocity product set up in portable terminal and base station.

When described base station position information acquiring unit has obtained the latitude and longitude information of broadcasting separately at least two base stations respectively, the latitude and longitude information of per two base stations is determined portable terminal corresponding reference latitude and longitude information respectively in described at least two base stations that described location information of mobile terminal determining unit is obtained according to described base station position information acquiring unit, again with all with reference to the mean value of the mean value of longitude information and reference latitude information as the final latitude and longitude information of portable terminal.

When described base station position information acquiring unit has obtained at least two latitude and longitude information and elevation informations that broadcast separately the base station respectively, and when described at least two base stations are the above base station of three or three, described location information of mobile terminal determining unit is determined portable terminal corresponding reference latitude and longitude information and elevation information respectively according to the latitude and longitude information and the elevation information of per three base stations that described base station position information acquiring unit obtains, again with all mean value with reference to longitude information, the mean value of the mean value of reference latitude information and reference altitude information is as portable terminal final latitude and longitude information and elevation information.

A kind of mobile terminal location system that the embodiment of the invention provides comprises:

At least two base stations are used for the positional information of broadcast base station;

Portable terminal, be used for obtaining respectively the base station position information that broadcast separately described at least two base stations, determine the distance between each base station in portable terminal and described at least two base stations respectively, and determine location information of mobile terminal according to the positional information of each base station in described at least two base stations and the distance between portable terminal and each base station.

Described portable terminal that described portable terminal is determined and the distance between the base station are: 1/2nd of the upward signal transmitting time lead of each definite in uplink synchronous process ascending time slot and light velocity product set up in portable terminal and base station.

When described portable terminal has obtained the latitude and longitude information of the base station that described at least two adjacent base stations broadcast separately respectively, described portable terminal is determined described portable terminal corresponding reference latitude and longitude information respectively according to the latitude and longitude information of per two base stations in its described at least two base stations that obtain, again with all with reference to the mean value of the mean value of longitude information and reference latitude information as the final latitude and longitude information of described portable terminal.

When described portable terminal when to have obtained the latitude and longitude information of the base station that described at least two adjacent base stations broadcast separately and elevation information and described at least two base stations respectively be three or three above base stations, described portable terminal is determined described portable terminal corresponding reference latitude and longitude information and elevation information respectively according to the latitude and longitude information of its per three base stations that obtain and elevation information, again with the mean value of the mean value of all mean values, reference latitude information and reference altitude information with reference to longitude information as described portable terminal final latitude and longitude information and elevation information.

When the embodiment of the invention is located own position at portable terminal, positional information and this portable terminal according at least two adjacent base stations are determined mobile terminal locations to the distance of described each base station, not only do not need to increase the flow of air interface, and make portable terminal can comparatively accurately locate the position of oneself.

Description of drawings

Fig. 1 is the structure of time slot of TD_SCDMA;

Fig. 2 is a range information schematic diagram of determining portable terminal and base station in the embodiment of the invention;

Fig. 3 determines the mobile terminal locations schematic diagram in the embodiment of the invention;

Fig. 4 is a mobile terminal positioning method flow chart in the embodiment of the invention;

Fig. 5 is the positioner schematic diagram of portable terminal in the embodiment of the invention.

Embodiment

The mobile terminal locating method that the embodiment of the invention proposes, determine location information of mobile terminal according to portable terminal positional information of each base station in the distance of at least two base stations and described two base stations, not only do not need to increase the flow of air interface, and can make portable terminal can comparatively accurately locate the position of oneself.

In the embodiment of the invention, positional information is separately carried in the base station in broadcast, the base station of this cell base station of mobile terminal to search and peripheral cell to be obtaining the broadcast of at least two base stations, and the broadcast of understanding each base station respectively obtains the positional information of each base station.

Distance between portable terminal and each base station of searching can be determined in the process of uplink synchronous is set up in portable terminal and base station, in the TD-SCDMA mobile communication system, requirement can arrive base station, i.e. uplink synchronous synchronously from the upward signal of the different mobile terminal of different distance; Portable terminal is being set up in the uplink synchronous process with a base station, the time quantum that portable terminal utilizes moment that time quantum that its moment that sends uplink synchronous code to this base station shifts to an earlier date than the predetermined instant of base station and this base station receive this uplink synchronous code to shift to an earlier date than the predetermined instant of base station is determined the distance between oneself and this base station, and portable terminal utilizes this method to determine distance between itself and each base station that can search; The positional information of the distance of basis oneself and described each base station and each base station is determined the position of portable terminal oneself then.

The positional information that portable terminal obtains at least two base stations with and and each base stations of described two base stations between distance after, can utilize definite oneself the positional information of range formula, hyperbola or the hyperboloid localization method of portable terminal and described each base station.

The mobile terminal locating method that the embodiment of the invention is provided is described in detail below:

One, portable terminal obtains the positional information that broadcast separately at least two base stations

Each base station increases the positional information that field is come broadcast base station in broadcast, the positional information of base station comprises the latitude and longitude information of base station, can also comprise elevation information, and wherein elevation information has two, and one is sea level altitude, can obtain by GPS; Another is the height with respect to ground, can obtain when the network planning;

Reside in the portable terminal in certain base station cell search for this cell base station and peripheral cell before setting up the uplink synchronous process base station with at least two broadcast messages that broadcast separately the base station of acquisition, the broadcast message that portable terminal is understood the base station respectively can obtain the positional information of respective base station.

Two, determine the distance of portable terminal and base station

Distance between portable terminal and each base station of searching can be determined in the process of uplink synchronous is set up in portable terminal and base station.

In the beginning of mobile terminal random access process, portable terminal must with its resident base station set up uplink synchronous, thereby make the upward signal of all portable terminals of residing in same base station to arrive the base station at sync bit.

Wherein, portable terminal and the base station process of setting up uplink synchronous comprises:

Portable terminal shifts to an earlier date the certain hour amount than the predetermined instant of base station, sends SYNC_UL (Synchronous_UpLink, uplink synchronous code) at UpPTS (Uplink Pilot TimeSlot, uplink pilot time slot) time slot to the base station; Wherein, the predetermined instant information of base station is read in the process by the system information of portable terminal before setting up the uplink synchronous process and obtains;

After SYNC_UL is received in the base station, determine the transmitting time adjustment information, and return this transmitting time adjustment information to portable terminal according to the moment of receiving SYNC_UL and the predetermined instant of oneself;

The transmitting time adjustment information that portable terminal returns according to the base station is determined the time quantum that moment that the base station receives this SYNC_UL shifts to an earlier date than the predetermined instant of base station;

The time quantum that the moment that time quantum that portable terminal sends described SYNC_UL according to portable terminal the moment shifts to an earlier date than the predetermined instant of base station and base station receive this SYNC_UL shifts to an earlier date than the predetermined instant of base station, determine the portable terminal upward signal transmitting time lead of each ascending time slot afterwards, afterwards, portable terminal if than ascending time slot in advance this transmitting time lead send upward signal to the base station, this upward signal will arrive the base station in this ascending time slot position.

The embodiment of the invention utilizes the upward signal transmitting time lead of above-mentioned each ascending time slot to determine distance between portable terminal and the base station.

Consider that the method for the embodiment of the invention relates to the time slot of TD_SCDMA system, simply introduce the structure of time slot of TD_SCDMA below, consult the structure of time slot of TD_SCDMA shown in Figure 1, it is divided into 7 conventional time slots and 3 special time slots.7 conventional time slots are that (Ts0 always distributes to down link to Ts0～Ts6; Ts1 always distributes to up link); 3 special time slots are respectively DwPTS (Downlink Pilot Time Slot; descending pilot frequency time slot), GP (Main Guard Period For TDDOperation, protection time slot) and UpPTS.

Wherein, the UpPTS time slot is for setting up uplink synchronous design, it is that the SYNC_UL sequence of 128chips and the GP of 32chips form by length, SYNC_UL is one group of PN sign indicating number, be the characteristic signal that inserts at random in the TD-SCDMA system, be used for distinguishing different portable terminals at mobile terminal random access process.256 different SYNC_UL are arranged in the TD-SCDMA system, be divided into 32 groups, every group comprises 8 SYNC_UL.8 SYNC_UL in above-mentioned each code character are concerning the base station and to have obtained the portable terminal of down-going synchronous all be known.When portable terminal will be set up uplink synchronous, will from these 8 known SYNC_UL, select 1 at random, and in UpPTS, launch according to timing and the performance number estimated.

Consult definite portable terminal shown in Figure 2 and base station apart from schematic diagram, portable terminal resides in the sub-district of a base station, supposes that portable terminal is d to the time gap of this base station, then the time reference of portable terminal postpones d than the time reference of this base station; In conjunction with Fig. 2, the concrete workflow of the definite portable terminal of the embodiment of the invention and the method for base station distance is as described below:

Portable terminal begins to set up uplink synchronous to its resident base station, and portable terminal shifts to an earlier date certain hour a than the predetermined instant of this base station, sends SYNC_UL at the UpPTS time slot to the base station; Wherein, the predetermined instant of base station is read in the process by the system information of portable terminal before setting up the uplink synchronous process and obtains;

In 4 subframes of base station after receiving SYNC_UL, return to portable terminal and to receive the response, comprise ID and the transmitting time adjustment information of the SYNC_UL that receive the base station in receiveing the response; Because the distance between base station and the portable terminal, base station receive the moment of SYNC_UL and postpone d than the moment that portable terminal sends SYNC_UL;

Wherein, the ID of above-mentioned SYNC_UL is used for discerning the portable terminal that sends this SYNC_UL, and will receive the response according to this ID and return to the portable terminal that sends this SYNC_UL; The transmitting time adjustment information can be the moment (this is the moment with respect to the synchronising base station of base station constantly) that SYNC_UL is received in the base station, also can be the time quantum that the SYNC_UL sign indicating number is received in the base station constantly shifts to an earlier date than base station predetermined instant;

The time quantum that the moment that portable terminal is received needs definite base station to receive the SYNC_UL sign indicating number after the transmitting time adjustment information of returning the base station shifts to an earlier date than base station predetermined instant; When above-mentioned transmitting time adjustment information is that the base station is when receiving the moment of SYNC_UL, measure pre-set time according to definite reception of the moment that SYNC_UL is received in predetermined instant and this base station of base station, it determines that method is s=T-T1, wherein, T is the predetermined instant of base station, T1 is the moment that SYNC_UL is received in the base station, and s is the time quantum that the SYNC_UL sign indicating number is received in the base station constantly shifts to an earlier date than base station predetermined instant; And when the above-mentioned transmitting time adjustment information time quantum s that to be base station moment of receiving the SYNC_UL sign indicating number shift to an earlier date than base station predetermined instant, the time quantum that the moment that then can directly determine to receive the SYNC_UL sign indicating number in the base station shifts to an earlier date than base station predetermined instant is s;

The time quantum s that the moment that time quantum a that portable terminal sends described SYNC_UL according to portable terminal the moment shifts to an earlier date than the predetermined instant of base station and base station receive this SYNC_UL shifts to an earlier date than the predetermined instant of base station, determine the portable terminal upward signal transmitting time lead X of each ascending time slot afterwards, it determines that method is: X=a-s; Afterwards, portable terminal is as long as the time quantum that shifts to an earlier date X=a-s than ascending time slot sends upward signal to the base station, and this upward signal will arrive the base station in this ascending time slot position;

Consult Fig. 2 as seen, portable terminal to the time gap of base station is $d=\frac{a-s}{2},$ Promptly $d=\frac{X}{2},$ Being scaled portable terminal to the actual range of base station is $L=\left(\frac{a-s}{2}\right)*C,$ Promptly $L=\frac{X*C}{2},$ C is the light velocity; That is: the distance between portable terminal and base station be portable terminal and base station set up in the uplink synchronous process upward signal transmitting time lead of each ascending time slot of determining and light velocity product 1/2nd.

Three, determine mobile terminal locations

The embodiment of the invention is determined location information of mobile terminal by portable terminal according to the distance of each base station in the positional information of at least two base stations and portable terminal and described at least two base stations when determining mobile terminal locations.The method of concrete definite mobile terminal locations is divided into following several again:

1, when the positional information of portable terminal acquisition base station comprises latitude and longitude information, in at least two base stations, the latitude and longitude information of per two base stations is determined portable terminal corresponding reference latitude and longitude information respectively, again with all with reference to the mean value of the mean value of longitude information and all reference latitude information as the final latitude and longitude information of portable terminal.It can be divided into following two kinds of methods:

(1) first range formula localization method

Consult shown in Figure 3, suppose that the latitude and longitude information that portable terminal only obtains base station 1 and base station 2 to broadcast separately is respectively (x1, y1) and (x2, y2), portable terminal can be determined the range equation of portable terminal and base station 1 and base station 2 respectively and unite to find the solution these two range equations and obtain portable terminal corresponding reference latitude and longitude information according to the latitude and longitude information of base station 1 and base station 2, and this is the final latitude and longitude information of portable terminal with reference to latitude and longitude information.It determines that specifically method is as follows:

The latitude and longitude information of supposing portable terminal for (x, y), L1 and L2 are respectively the distance between portable terminal and base station 1 and the base station 2:

At first utilize the latitude and longitude information of base station 1 and base station 2 to determine two range equations of portable terminal and base station 1 and base station 2:

$\sqrt{{(x-x1)}^2+{(y-y1)}^2}=L1...................................\left(1\right)$

$\sqrt{{(x-x2)}^2+{(y-y2)}^2}=L2...................................\left(2\right)$

Find the solution according to above-mentioned equation (1) and (2) that (x y) obtains the reference latitude and longitude information of portable terminal, and this is the final latitude and longitude information of portable terminal with reference to latitude and longitude information.

Outside getting access to the latitude and longitude information of above-mentioned base station 1 and base station 2, portable terminal also got access to the latitude and longitude information (x3 of base station 3, y3), then portable terminal can be determined the range equation of each base station in portable terminal and per two base stations respectively and find the solution these two equations to obtain portable terminal corresponding reference latitude and longitude information according to the latitude and longitude information of per two base stations in base station 1, base station 2 and the base station 3, again with all with reference to the mean value of the mean value of longitude information and all reference latitude information as the final latitude and longitude information of portable terminal.That is:

At first utilize base station 3 latitude and longitude information (x3, y3) determine the range equation of portable terminal and base station 3:

$\sqrt{{(x-x3)}^2+{(y-y3)}^2}=L3...................................\left(3\right)$

Then solving equation (1) and (2) obtain portable terminal the reference latitude and longitude information (X1, Y1); Solving equation (1) and (3) obtain portable terminal the reference latitude and longitude information (X2, Y2); Solving equation (2) and (3) obtain portable terminal the reference latitude and longitude information (X3, Y3);

At last with the mean value of the mean value of X1, X2 and X3 and Y1, Y2 and Y3 as the final latitude and longitude information of portable terminal $(\frac{X1+X2+X3}{3},\frac{Y1+Y2+Y3}{3}).$

Below only be to understand that for example portable terminal utilizes this method to determine the process of portable terminal latitude and longitude information when obtaining the latitude and longitude information of two and three base stations broadcasting separately, it is determined that the method for portable terminal latitude and longitude information can establish an equation successively according to said method and finds the solution when portable terminal has got access to latitude and longitude information more than three base station broadcast.

(2) hyperbola positioning method

Consult shown in Figure 3, suppose that the latitude and longitude information that portable terminal only obtains to broadcast separately in base station 1, base station 2 and base station 3 is respectively (x1, y1), (x2, y2) and (x3, y3), portable terminal can also be determined portable terminal corresponding reference latitude and longitude information by hyperbola positioning method respectively according to the latitude and longitude information of base station 1, base station 2 and base station 3, again with all with reference to the mean value of the mean value of longitude information and all reference latitude information as the final latitude and longitude information of portable terminal.

The latitude and longitude information of supposing portable terminal for (x, y), L1, L2 and L3 are respectively the distance between portable terminal and base station 1, base station 2 and the base station 3;

At first portable terminal is determined following two uncorrelated equations according to the latitude and longitude information of base station 1, base station 2 and base station 3 and L1, L2 and L3:

$\sqrt{{(x-x1)}^2+{(y-y1)}^2}-\sqrt{{(x-x2)}^2+{(y-y2)}^2}=L1-L2................\left(4\right)$

$\sqrt{{(x-x1)}^2+{(y-y1)}^2}-\sqrt{{(x-x3)}^2+{(y-y3)}^2}=L1-L3................\left(5\right)$

Find the solution according to above-mentioned equation (4) and (5) that (x y) obtains the reference latitude and longitude information of portable terminal, and this is the final latitude and longitude information of portable terminal with reference to latitude and longitude information.

When above-mentioned portable terminal has also got access to the latitude and longitude information (x4 of base station 4 except that the latitude and longitude information that gets access to above-mentioned base station 1, base station 2 and base station 3, y4), then portable terminal can be according in base station 1,2 base stations 3, base station and the base station 4, the latitude and longitude information of per three base stations is determined portable terminal corresponding reference latitude and longitude information respectively by hyperbola positioning method, again with all with reference to the mean value of the mean value of longitude information and all reference latitude information as the final latitude and longitude information of portable terminal.That is:

At first utilize base station 4 latitude and longitude information (x4, y4) determine following equation:

$\sqrt{{(x-x1)}^2+{(y-y1)}^2}-\sqrt{{(x-x4)}^2+{(y-y4)}^2}=L1-L4................\left(6\right)$

Get the synthetic equation group of any two equation group in above-mentioned equation (4), (5) and (6) then respectively, find the solution according to these equation group respectively that (x y) obtains corresponding mobile terminal with reference to latitude and longitude information; If the portable terminal that obtains has n with reference to latitude and longitude information, then the latitude and longitude information of portable terminal is (Xi is that corresponding i portable terminal is with reference to latitude and longitude information Yi).

Below only be to understand that for example portable terminal utilizes hyperbola positioning method to determine the process of portable terminal latitude and longitude information when obtaining the latitude and longitude information of three and four base stations broadcasting separately, it is determined that the method for portable terminal latitude and longitude information can establish an equation successively according to said method and finds the solution when portable terminal has got access to latitude and longitude information more than four base station broadcasts.

2, when the positional information of portable terminal acquisition base station comprises latitude and longitude information and elevation information, in at least three base stations, the latitude and longitude information of per three base stations is determined portable terminal corresponding reference latitude and longitude information and elevation information respectively, again with the mean value of the mean value of all mean values, all reference latitude information and all reference altitude information with reference to longitude information as portable terminal final latitude and longitude information and elevation information.It can be divided into following two kinds of methods:

(1) second distance formula localization method

Consult shown in Figure 3, suppose that portable terminal obtains base station 1, latitude and longitude information and the elevation information that broadcast separately base station 2 and base station 3 are respectively (x1, y1, z1), (x2, y2, z2) and (x3, y3, z3), portable terminal can be according to base station 1, the latitude and longitude information of base station 2 and base station 3 and elevation information are determined portable terminal and base station 1 respectively, the range equation of base station 2 and base station 3 and according to these three equation solution (x, y z) obtains the reference latitude and longitude information and the elevation information of portable terminal, and this is final latitude and longitude information of portable terminal and elevation information with reference to latitude and longitude information and elevation information.

Suppose the latitude and longitude information of portable terminal and elevation information for (z), L1, L2 and L3 are respectively the distance between portable terminal and base station 1, base station 2 and the base station 3 for x, y:

At first utilize the latitude and longitude information of base station 1, base station 2 and base station 3 and elevation information determine portable terminal respectively with the range equation of base station 1, base station 2 and base station 3:

$\sqrt{{(x-x1)}^2+{(y-y1)}^2+{(z-z1)}^2}=L1......................\left(7\right)$

$\sqrt{{(x-x2)}^2+{(y-y2)}^2+{(z-z2)}^2}=L2......................\left(8\right)$

$\sqrt{{(x-x3)}^2+{(y-y3)}^2+{(z-z3)}^2}=L3......................\left(9\right)$

Find the solution according to above-mentioned equation (7), (8) and (9) that (x, y z) obtain the reference latitude and longitude information and the elevation information of portable terminal, and this is final latitude and longitude information of portable terminal and elevation information with reference to latitude and longitude information and elevation information.

When removing, above-mentioned portable terminal gets access to above-mentioned base station 1, the latitude and longitude information of base station 2 and base station 3 and elevation information have also got access to the latitude and longitude information and the elevation information (x4 of base station 4 outward, y4, z4), then portable terminal can be according to base station 1, base station 2, in base station 3 and the base station 4, the latitude and longitude information of per three base stations and elevation information are determined the range equation of each base station in portable terminal and per three base stations respectively and according to these three equation solution (x, y, z) obtain corresponding mobile terminal with reference to latitude and longitude information and elevation information, again with all mean value with reference to longitude information, the mean value of the mean value of reference latitude information and reference altitude information is as portable terminal final latitude and longitude information and elevation information.That is:

At first utilize base station 4 latitude and longitude information (x4, y4 z4) determine the range equation of portable terminal and base station 4:

$\sqrt{{(x-x4)}^2+{(y-y4)}^2+{(z-z4)}^2}=L4......................\left(10\right)$

Get the synthetic equation group of any three equation group in above-mentioned equation (7), (8), (9) and (10) then respectively, find the solution according to these equation group that (x, y z) obtain corresponding mobile terminal with reference to latitude and longitude information and elevation information; If the portable terminal that obtains is m with reference to latitude and longitude information and reference altitude information, then final latitude and longitude information and the elevation information of portable terminal is (Xi, Yi Zi) are the reference latitude and longitude information and the elevation information of i portable terminal of correspondence.

Below only be to understand that for example portable terminal utilizes said method to determine the process of mobile terminal locations when latitude and longitude information that obtains three and four base stations to broadcast separately and elevation information, it is determined that the method for location information of mobile terminal can establish an equation successively according to said method and finds the solution when portable terminal has got access to more than the latitude and longitude information of four base station broadcasts and elevation information.

(2) hyperboloid localization method

Consult shown in Figure 3, suppose that portable terminal obtains base station 1, base station 2, latitude and longitude information and the elevation information that broadcast separately base station 3 and base station 4 are respectively (x1, y1, z1), (x2, y2, z2), (x3, y3, z3) and (x4, y4, z4), portable terminal can also be respectively according to base station 1, base station 2, the positional information of base station 3 and base station 4, determine portable terminal corresponding reference positional information by the hyperboloid localization method, again with all mean value with reference to longitude information, the mean value of the mean value of reference latitude information and reference altitude information is as portable terminal final latitude and longitude information and elevation information.

The positional information of supposing portable terminal for (z), L1, L2, L3 and L4 are respectively the distance between portable terminal and base station 1, base station 2, base station 3 and the base station 4 for x, y:

At first portable terminal is determined following three uncorrelated equations according to positional information and L1, L2, L3 and the L4 of base station 1, base station 2, base station 3 and base station 4:

$\sqrt{{(x-x1)}^2+{(y-y1)}^2+{(z-z1)}^2}-\sqrt{{(x-x2)}^2+{(y-y2)}^2+{(z-z2)}^2}=L1-L2...\left(12\right)$

$\sqrt{{(x-x2)}^2+{(y-y2)}^2+{(z-z2)}^2}-\sqrt{{(x-x3)}^2+{(y-y3)}^2+{(z-z3)}^2}=L2-L3...\left(13\right)$

$\sqrt{{(x-x1)}^2+{(y-y1)}^2+{(z-z1)}^2}-\sqrt{{(x-x4)}^2+{(y-y4)}^2+{(z-z4)}^2}=L1-L4...\left(14\right)$

(x, y z) obtain the reference latitude and longitude information and the elevation information of portable terminal, and this is the final latitude and longitude information and the elevation information of portable terminal with reference to latitude and longitude information and elevation information according to above-mentioned three uncorrelated equation solutions.

When removing, above-mentioned portable terminal gets access to above-mentioned base station 1, base station 2, the positional information of base station 3 and base station 4 has also got access to the positional information (x5 of base station 5 outward, y5, z5), then portable terminal can be according to base station 1, base station 2, base station 3, in base station 4 and the base station 5, the positional information of per four base stations is determined portable terminal corresponding reference latitude and longitude information and elevation information respectively by the hyperboloid localization method, again with all mean value with reference to longitude information, the mean value of the mean value of reference latitude information and reference altitude information is as portable terminal final latitude and longitude information and elevation information.

Below only be to understand that for example portable terminal utilizes said method to determine the process of mobile terminal locations when latitude and longitude information that obtains four and five base stations to broadcast separately and elevation information, the method for determining location information of mobile terminal when portable terminal has got access to more than the latitude and longitude information of five base station broadcasts and elevation information can establish an equation successively according to said method and find the solution.

As shown in Figure 4, the method flow of the portable terminal of embodiment of the invention location is as follows:

S401, portable terminal obtain the positional information that broadcast separately at least two base stations respectively.

The positional information of described base station comprises latitude and longitude information, can also comprise elevation information.

S402, portable terminal are determined the distance between each base station in portable terminal and above-mentioned at least two base stations respectively.

Distance between portable terminal and base station be portable terminal and base station set up in the uplink synchronous process upward signal transmitting time lead of each ascending time slot of determining and light velocity product 1/2nd.

S403, portable terminal are determined location information of mobile terminal according to the positional information of each base station in above-mentioned at least two base stations and the distance between portable terminal and each base station; This step S403 further may further comprise the steps:

Positional information when above-mentioned at least two base stations that portable terminal gets access to comprises latitude and longitude information, then portable terminal can be determined portable terminal corresponding reference latitude and longitude information respectively according to the latitude and longitude information of per two base stations in above-mentioned at least two base stations, again with the mean value of all mean values, reference latitude information with reference to longitude information as the final latitude and longitude information of portable terminal, concrete computational methods are seen before and are stated the first range formula localization method; When portable terminal has got access to the latitude and longitude information of three or three above base stations, then portable terminal can be determined portable terminal corresponding reference latitude and longitude information respectively according to the latitude and longitude information of per three base stations, again with the mean value of all mean values, reference latitude information with reference to longitude information as the final latitude and longitude information of portable terminal, concrete computational methods are seen aforesaid hyperbola positioning method;

Got access to the positional information of three or three above base stations when portable terminal, and the positional information of each base station comprises latitude and longitude information and elevation information, then portable terminal can be determined portable terminal corresponding reference latitude and longitude information and elevation information respectively according to the latitude and longitude information of per three base stations in above-mentioned three or three the above base stations, again with all mean value with reference to longitude information, the mean value of the mean value of reference latitude information and reference altitude information is as portable terminal final latitude and longitude information and elevation information, and concrete computational methods are seen before and stated second distance formula localization method; When portable terminal has got access to the latitude and longitude information of four or more base station and elevation information, then portable terminal can be determined portable terminal corresponding reference latitude and longitude information respectively according to the latitude and longitude information and the elevation information of per four base stations, again with the mean value of the mean value of all mean values, reference latitude information and reference altitude information with reference to longitude information as portable terminal final latitude and longitude information and elevation information, concrete computational methods are seen aforesaid hyperboloid localization method.

A kind of preferred implementation of the embodiment of the invention is a portable terminal according to the positional information of the positional information of the resident base station of portable terminal, the base station adjacent with the resident base station of portable terminal and the distance of portable terminal and above-mentioned each base station, determines mobile terminal locations; The base station adjacent with the resident base station of portable terminal is many more, and the base station position information that portable terminal obtains is many more, and the mobile terminal locations of calculating is just accurate more.

As shown in Figure 5, the portable terminal positioner of the embodiment of the invention is used for mobile terminal side, comprising:

Base station position information acquiring unit 51 is used for obtaining respectively the positional information that broadcast separately at least two base stations;

Distance determining unit 52 is used for the distance between definite respectively portable terminal and each base station, above-mentioned at least two base stations;

Location information of mobile terminal determining unit 53, the positional information of each base station, at least two base stations that is used for obtaining according to base station position information acquiring unit 51 and the portable terminal that distance determining unit 52 is determined and the distance between each base station are further determined location information of mobile terminal.

Wherein, portable terminal and the distances between the base station that distance determining unit 52 is determined are: 1/2nd of the upward signal transmitting time lead of each ascending time slot of determining in the uplink synchronous process and light velocity product set up in portable terminal and base station, and its specifically definite method is the aforesaid first range formula localization method, hyperbola positioning method, second distance formula localization method and hyperboloid localization method etc.

When base station position information acquiring unit 51 has obtained the latitude and longitude information of broadcasting separately at least two base stations respectively, location information of mobile terminal determining unit 53 can be determined portable terminal corresponding reference latitude and longitude information respectively according to the latitude and longitude information of per two base stations at least two base stations, again with all with reference to the mean value of the mean value of longitude information and reference latitude information as the final latitude and longitude information of portable terminal.

When base station position information acquiring unit 51 when to have obtained the latitude and longitude information broadcasted separately at least two base stations and elevation information and at least two base stations respectively be three or three above base stations, location information of mobile terminal determining unit 53 is determined portable terminal corresponding reference latitude and longitude information and elevation information respectively according to the latitude and longitude information of per three base stations and elevation information, again with the mean value of the mean value of all mean values, reference latitude information and reference altitude information with reference to longitude information as portable terminal final latitude and longitude information and elevation information.

The embodiment of the invention also provides the mobile terminal device of using above-mentioned portable terminal positioner.

Consult shown in Figure 3ly, the embodiment of the invention also provides a kind of mobile terminal location system, comprising:

At least two base stations are used for the positional information of broadcast base station;

Portable terminal, be used for obtaining respectively the base station position information that broadcast separately at least two base stations, determine the distance between each base station in portable terminal and above-mentioned at least two base stations respectively, and determine location information of mobile terminal according to the positional information of each base station in above-mentioned at least two base stations and the distance between portable terminal and each base station.

Wherein, portable terminal and the distance between the base station determined of portable terminal is: 1/2nd of the upward signal transmitting time lead of each definite in uplink synchronous process ascending time slot and light velocity product set up in portable terminal and base station.

When portable terminal has obtained the latitude and longitude information of the base station that at least two adjacent base stations broadcast separately respectively, portable terminal can be determined portable terminal corresponding reference latitude and longitude information respectively according to the latitude and longitude information of per two base stations in its at least two base stations that obtain, again with all with reference to the mean value of the mean value of longitude information and reference latitude information as the final latitude and longitude information of portable terminal.

When portable terminal when to have obtained the latitude and longitude information of the base station that at least two adjacent base stations broadcast separately and elevation information and at least two base stations respectively be three or three above base stations, portable terminal can be determined portable terminal corresponding reference latitude and longitude information and elevation information respectively according to the latitude and longitude information of its per three base stations that obtain and elevation information, again with the mean value of the mean value of all mean values, reference latitude information and reference altitude information with reference to longitude information as portable terminal final latitude and longitude information and elevation information.

The mobile terminal locating method that the embodiment of the invention provides, Apparatus and system are when the localisation of mobile terminals position, positional information and portable terminal according at least two adjacent base stations are determined mobile terminal locations to the distance of described each base station, not only do not need to increase the flow of air interface, and make portable terminal can comparatively accurately locate the position of oneself.

Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims (30)

1, a kind of mobile terminal locating method is characterized in that, may further comprise the steps:

Obtain the base station position information that broadcast separately at least two base stations respectively;

Determine the distance between each base station in portable terminal and described at least two base stations respectively;

Determine location information of mobile terminal according to the positional information of each base station in described at least two base stations and the distance between portable terminal and each base station.

2, the method for claim 1 is characterized in that, the distance between portable terminal and the base station is: 1/2nd of the upward signal transmitting time lead of each ascending time slot of determining and light velocity product set up in the uplink synchronous process in portable terminal and base station.

3, method as claimed in claim 1 or 2 is characterized in that, described base station position information and location information of mobile terminal comprise latitude and longitude information.

4, method as claimed in claim 3, it is characterized in that, determine portable terminal corresponding reference latitude and longitude information respectively according to the latitude and longitude information of per two base stations in described at least two base stations, again with all with reference to the mean value of the mean value of longitude information and reference latitude information as the final latitude and longitude information of portable terminal.

5, method as claimed in claim 4 is characterized in that, utilizes following equation to determine portable terminal corresponding reference latitude and longitude information according to the latitude and longitude information of per two base stations:

$\sqrt{{(x-x1)}^2+{(y-y1)}^2}=L1$

$\sqrt{{(x-x2)}^2+{(y-y2)}^2}=L2$

Described L1 is that latitude and longitude information is (x1 in portable terminal and described per two base stations, y1) distance between the base station, described L2 is that latitude and longitude information is (x2 in portable terminal and described per two base stations, y2) distance between the base station, it is described that (x y) is portable terminal corresponding reference latitude and longitude information.

6, method as claimed in claim 3, it is characterized in that, described at least two base stations are three or three above base stations, determine portable terminal corresponding reference latitude and longitude information respectively according to the latitude and longitude information of per three base stations, again with all with reference to the mean value of the mean value of longitude information and reference latitude information as the final latitude and longitude information of portable terminal.

7, method as claimed in claim 6 is characterized in that, determines that according to the latitude and longitude information of per three base stations the method for portable terminal corresponding reference latitude and longitude information is a hyperbola positioning method.

8, method as claimed in claim 3 is characterized in that, described base station position information and location information of mobile terminal also comprise elevation information.

9, method as claimed in claim 8, it is characterized in that, described at least two base stations are three or three above base stations, determine portable terminal corresponding reference latitude and longitude information and elevation information respectively according to the latitude and longitude information of per three base stations and elevation information, again with the mean value of the mean value of all mean values, reference latitude information and reference altitude information with reference to longitude information as portable terminal final latitude and longitude information and elevation information.

10, method as claimed in claim 9 is characterized in that, utilizes following equation to determine portable terminal corresponding reference latitude and longitude information and elevation information according to the latitude and longitude information and the elevation information of per three base stations:

$\sqrt{{(x-x1)}^2+{(y-y1)}^2+{(z-z1)}^2}=L1$

$\sqrt{{(x-x2)}^2+{(y-y2)}^2+{(z-z2)}^2}=L2$

$\sqrt{{(x-x3)}^2+{(y-y3)}^2+{(z-z3)}^2}=L3$

Described L1 is that latitude and longitude information and elevation information are (x1 in portable terminal and described per three base stations, y1, z1) distance between the base station, described L2 is that latitude and longitude information and elevation information are (x2 in portable terminal and described per three base stations, y2, z2) distance between the base station, described L3 is that latitude and longitude information and elevation information are (x3 in portable terminal and described per three base stations, y3, z3) distance between the base station, it is described that (x, y z) are portable terminal corresponding reference latitude and longitude information and elevation information.

11, method as claimed in claim 9, it is characterized in that, described at least three base stations are four or more base station, determine portable terminal corresponding reference latitude and longitude information and elevation information respectively according to the latitude and longitude information of per four base stations and elevation information, again with the mean value of the mean value of all mean values, reference latitude information and reference altitude information with reference to longitude information as portable terminal final latitude and longitude information and elevation information.

12, method as claimed in claim 11 is characterized in that, determines that according to the latitude and longitude information and the elevation information of per four base stations the method for portable terminal corresponding reference latitude and longitude information and elevation information is the hyperboloid localization method.

13, a kind of portable terminal positioner is characterized in that, comprising:

The base station position information acquiring unit is used for obtaining respectively the positional information that broadcast separately at least two base stations;

Distance determining unit is used for the distance between definite respectively portable terminal and each base station, described at least two base stations;

The location information of mobile terminal determining unit is used for the positional information of each base station, described at least two base stations of obtaining according to described base station position information acquiring unit and described portable terminal and the distance between each base station that described distance determining unit is determined and further determines location information of mobile terminal.

14, device as claimed in claim 13, it is characterized in that portable terminal and the distance between the base station that described distance determining unit is determined are: 1/2nd of the upward signal transmitting time lead of each definite in uplink synchronous process ascending time slot and light velocity product set up in portable terminal and base station.

As claim 13 or 14 described devices, it is characterized in that 15, described base station position information acquiring unit obtains the latitude and longitude information that broadcast separately at least two base stations respectively.

16, device as claimed in claim 15, it is characterized in that, the latitude and longitude information of per two base stations is determined portable terminal corresponding reference latitude and longitude information respectively in described at least two base stations that described location information of mobile terminal determining unit is obtained according to described base station position information acquiring unit, again with all with reference to the mean value of the mean value of longitude information and reference latitude information as the final latitude and longitude information of portable terminal.

17, device as claimed in claim 15 is characterized in that, described base station position information acquiring unit also obtains the elevation information that broadcast separately described at least two base stations respectively.

18, device as claimed in claim 17, it is characterized in that, when described at least two base stations are three or three above base stations, the latitude and longitude information of per three base stations that described location information of mobile terminal determining unit is obtained according to described base station position information acquiring unit and elevation information are determined portable terminal corresponding reference latitude and longitude information and elevation information respectively, again with the mean value of the mean value of all mean values, reference latitude information and reference altitude information with reference to longitude information as portable terminal final latitude and longitude information and elevation information.

19, a kind of portable terminal is characterized in that, comprising:

The base station position information acquiring unit is used for obtaining respectively the positional information that broadcast separately at least two base stations;

Distance determining unit is used for the distance between definite respectively portable terminal and each base station, described at least two base stations;

The location information of mobile terminal determining unit is used for the positional information of each base station, described at least two base stations of obtaining according to described base station position information acquiring unit and described portable terminal and the distance between each base station that distance determining unit is determined and further determines location information of mobile terminal.

20, portable terminal as claimed in claim 19, it is characterized in that portable terminal and the distance between the base station that described distance determining unit is determined are: 1/2nd of the upward signal transmitting time lead of each definite in uplink synchronous process ascending time slot and light velocity product set up in portable terminal and base station.

As claim 19 or 20 described portable terminals, it is characterized in that 21, described base station position information acquiring unit obtains the latitude and longitude information that broadcast separately at least two base stations respectively.

22, portable terminal as claimed in claim 21, it is characterized in that, the latitude and longitude information of per two base stations is determined portable terminal corresponding reference latitude and longitude information respectively in described at least two base stations that described location information of mobile terminal determining unit is obtained according to described base station position information acquiring unit, again with all with reference to the mean value of the mean value of longitude information and reference latitude information as the final latitude and longitude information of portable terminal.

23, portable terminal as claimed in claim 21 is characterized in that, described base station position information acquiring unit also obtains the elevation information that broadcast separately described at least two base stations respectively.

24, portable terminal as claimed in claim 23, it is characterized in that, when described at least two base stations are three or three above base stations, the latitude and longitude information of per three base stations that described location information of mobile terminal determining unit is obtained according to described base station position information acquiring unit and elevation information are determined portable terminal corresponding reference latitude and longitude information and elevation information respectively, again with the mean value of the mean value of all mean values, reference latitude information and reference altitude information with reference to longitude information as portable terminal final latitude and longitude information and elevation information.

25, a kind of mobile terminal location system is characterized in that, comprising:

At least two base stations are used for the positional information of broadcast base station;

Portable terminal, be used for obtaining respectively the base station position information that broadcast separately described at least two base stations, determine the distance between each base station in portable terminal and described at least two base stations respectively, and determine location information of mobile terminal according to the positional information of each base station in described at least two base stations and the distance between portable terminal and each base station.

26, system as claimed in claim 25, it is characterized in that described portable terminal that described portable terminal is determined and the distance between the base station are: 1/2nd of the upward signal transmitting time lead of each definite in uplink synchronous process ascending time slot and light velocity product set up in portable terminal and base station.

As claim 25 or 26 described systems, it is characterized in that 27, described portable terminal obtains the latitude and longitude information of the base station that described at least two adjacent base stations broadcast separately respectively.

28, system as claimed in claim 27, it is characterized in that, described portable terminal is determined described portable terminal corresponding reference latitude and longitude information respectively according to the latitude and longitude information of per two base stations in its described at least two base stations that obtain, again with all with reference to the mean value of the mean value of longitude information and reference latitude information as the final latitude and longitude information of described portable terminal.

29, system as claimed in claim 27 is characterized in that, described portable terminal also obtains the elevation information of the base station that described at least two adjacent base stations broadcast separately respectively.

30, system as claimed in claim 29, it is characterized in that, when described at least two base stations are three or three above base stations, described portable terminal is determined described portable terminal corresponding reference latitude and longitude information and elevation information respectively according to the latitude and longitude information of its per three base stations that obtain and elevation information, again with the mean value of the mean value of all mean values, reference latitude information and reference altitude information with reference to longitude information as described portable terminal final latitude and longitude information and elevation information.

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