CN102540204B - Single-chip dual-frequency global satellite navigation receiver - Google Patents
Single-chip dual-frequency global satellite navigation receiver Download PDFInfo
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Abstract
The invention discloses a single-chip dual-frequency global satellite navigation receiver. A global satellite navigation signal is divided into two frequency intervals of complementary angle image signals, two receiving channels on the same chip respectively receive global satellite navigation signals of each frequency interval, and the two receiving channels share two same frequency synthesizers for simultaneously receiving dual-frequency satellite navigation signals. The whole receiver comprises two configurable receiving channels and a baseband processing module, and the two receiving channels have the same circuit structure. Each independent configurable receiving channel comprises two stages of modules and can realize four receiving modes. Various modes of configuration of the receiver are completed through a digital interface 418 of an on-chip integrated SPI (Serial Peripheral Interface). A signal path of each receiving channel and a function of a configurable filter 411 module are configured through the digital interface of the SPI, and configuration of different wave bands of global satellite navigation signals is realized through changing output frequencies of the two frequency synthesizers. The receiver can work in four receiving modes.
Description
Technical field
The present invention relates to wireless communication electronics circuit engineering field, relate to dual-frequency global satellite navigation receiver, relate in particular to a kind of single-chip dual-frequency global satellite navigation receiver, be applied to receive the single-chip dual-frequency receiver of global navigation satellite signal.
Background technology
Global navigation satellite system GNSS a kind ofly be take transit satellite as basic radio navigation system, can broadcast high precision, round-the-clock, round-the-clock navigation, location and time service information, be a kind of shared information resources of the army and the people user for aeroamphibious field.The appearance of satellite navigation system, the problem of solved on a large scale, global and high precision is located fast, is applied to military domain, mainly provides location and navigation signal, for the power-driven tools such as car, ship, aircraft provide navigator fix information and precise guidance; For field operations or maneuver warfare army provide positioning service; For rescue personnel guides direction.Global navigation satellite system has huge use potentiality, its range of application expands to civilian, infiltrate into each department of national economy, comprise oil development in marine and desert, traffic administration, electric power transfer, resource investigation, disaster monitoring, public safety, relief, individual mobile phone location, business logistics management, fish production, civil engineering, archaeology etc.Satellite navigation system has become the spatial information infrastructure of digital earth, digital city.
At present, in the GNSS system of building and moving, have: the Galileo system in the gps system of the U.S., Muscovite GLONASS system, Europe and the Big Dipper two generations (BEIDOU) system of China.In the five-year, several large systems also will be developed rapidly, and global navigation satellite service can be provided.Till that time, GNSS satellite number will be over 100, and it is covering the whole world that each satellite navigation system envelop of function can be realized navigation signal substantially.
Along with the expansion of global navigation satellite system application and the extension of function, also more and more higher to the requirement of GNSS receiver positioning precision.With GPS receiver, with example, adopt single-frequency GPS receiver positioning precision limited, when dot spacing is when surpassing 20～30Km, positioning precision is subject to the restriction of ionospheric delay error.The advantage of dual-frequency receiver maximum is the satellite navigation signals that can simultaneously receive different frequency range, can substantially eliminate the impact of ionospheric delay error on position coordinate, dot spacing is from surpassing 1000Km, therefore dual-frequency receiver is not when adopting outside assisted location method, and positioning precision can reach 1m left and right.And when adopting real time dynamic differential to measure (RTK) technology, dual-frequency receiver can have the positioning precision of mm level, and this has important effect in the high-acruracy survey application such as geodetic surveying, engineering survey, photogrammetric measurement, earth movement monitoring, engineering project deformation monitoring.
Double frequency GNSS receiver requires to receive two-way GNSS signal simultaneously, traditional double frequency receiver adopts two RF front-end chips to form, as shown in Figure 1, satellite-signal, after antenna reception and LNA amplification, is divided into two paths of signals by power splitter (Power Splitter) by input signal.Two paths of signals by two independently single frequency receiving receive, then through ADC, convert digital signal to and give digital baseband and process simultaneously.Traditional double frequency receiver has following defect: first, whole receiver needs independently single frequency receiving of power splitter and two, so system hardware cost is high, and power consumption is large, and chip volume is large.Secondly, because each receiver has independently reference clock and exists spurious signal to distribute, thereby and these spurious signals mutually intermodulation affect the performance of receiver.
Summary of the invention
The object of the invention is to overcome single-frequency GPS receiver positioning precision limited, existing traditional double frequency receiver needs independently single frequency receiving of power splitter and two, therefore system hardware cost is high, power consumption is large, chip volume is large, thereby spurious signal mutually intermodulation affects the shortcomings such as performance of receiver, and meet the application demand of GNSS receiver, a kind of monolithic dual-frequency global satellite navigation receiver has been proposed, according to the feature of global navigation satellite signal, signal is divided into two frequency separations of image signal each other, by two receiving cables on same chip, receive respectively the global navigation satellite signal of each frequency separation, and two receiving cables share two identical frequency synthesizers, realize double frequency satellite navigation signals receives simultaneously.
The object of the invention is to realize by following technical scheme.A single-chip dual-frequency global satellite navigation receiver, its formation comprises:
(1) A receiving cable is receiving cable independently;
(2) B receiving cable is receiving cable independently;
(3) frequency synthesizer 1, for A receiving cable and B receiving cable provide local frequency LO1;
(4) frequency synthesizer 2, for A receiving cable and B receiving cable provide local frequency LO2;
(5) baseband processing module;
Described A receiving cable comprises A channel first order module and the A channel second level module being connected in series; The input end access 1.1-1.2/1.5-1.6GHz radio-frequency input signals RF of A channel first order module, the output terminal of A channel second level module is received baseband processing module;
Described B receiving cable comprises B passage first order module and the B passage second level module being connected in series; The input end access 1.1-1.2/1.5-1.6GHz radio-frequency input signals RF of B passage first order module, the output terminal of B passage second level module is received baseband processing module;
Described frequency synthesizer 1 output terminal LO1 connects the local oscillation signal input end of A channel first order module and B passage first order module;
Described frequency synthesizer 2 output terminal LO2 connect the local oscillation signal input end of A channel second level module and B passage second level module;
Two receiving cable basis signal configurations of described A and B receive respectively the global navigation satellite signal of a different frequency range, realize the function of the global navigation satellite signal that simultaneously receives two frequency ranges; Two receiving cables share same frequency compositor, than traditional double frequency global navigational satellite receiver, save two frequency synthesizers;
Two input ends of described baseband processing module connect the output terminal of A and two receiving cables of B, each input end signal is Low Medium Frequency or the zero intermediate frequency digital signal after receiving cable frequency conversion, filtering, amplification, analog to digital conversion, through baseband processing module, processes and realizes final location and navigation.
Described dual-frequency global satellite navigation receiver is integrated on same chip.
Described single-chip dual-frequency global satellite navigation receiver, it is described A and two receiving cables of B, be independently global navigational satellite signal receiving cable, receive signalling channel configuration and configured by digital interface by external microcontroller, each receiving cable is processed separately the satellite navigation signals of a frequency range.
Described single-chip dual-frequency global satellite navigation receiver, it is that the described global navigation satellite signal that simultaneously receives two frequency ranges comprises two different frequency range signals that simultaneously receive same satellite navigation system, or receive two frequency band signals of two different satellite navigation systems, the pattern that receives signal is configured by digital interface by external microcontroller simultaneously.
Described single-chip dual-frequency global satellite navigation receiver, it is that described two receiving cables share two frequency synthesizer modules, the first order level module shared frequency compositor 1 of the first order level module of A receiving cable and B receiving cable, the second level level module shared frequency compositor 2 of the second level level module of A receiving cable and B receiving cable, local oscillation signal is produced by frequency synthesizer module.
By changing the output frequency of two frequency synthesizers, realize different-waveband global navigation satellite signal configures simultaneously.
Described single-chip dual-frequency global satellite navigation receiver, its circuit structure that is described two receiving cables is identical, and each receiving cable is comprised of independent configurable two-rank module, and every one-level module connects a local oscillation signal.
Described single-chip dual-frequency global satellite navigation receiver, it is two-way satellite navigation signals that two receiving cables of described A and B receive image signal each other, wherein, each road receiving cable is realized the inhibition to another road image signal by complex filter in sheet outer filter or sheet.
Described single-chip dual-frequency global satellite navigation receiver, it is that each receiving cable of described two receiving cables is configurable receiving cable circuit structure, for according to different satellite-signals, be configured to a kind of circuit structure in the two circuit structures that convert of Low Medium Frequency, zero intermediate frequency and superhet.
Described single-chip dual-frequency global satellite navigation receiver, it is that described configurable receiving cable circuit structure comprises first order module, second level module and baseband processing module.In first order module, there is radio frequency amplifier, frequency mixer, and LC wave filter, second level module has intermediate frequency amplifier and frequency mixer, configurable wave filter (PPF/LPF), gain amplifier and A-D converter to form, sheet outside antenna receive send here the radiofrequency signal that contains high-frequency carrier wave of satellite launch, first through the changeable LNA low noise amplifier of input wave band in first order module, signal is amplified, by frequency mixer, be converted into the analog baseband signal of zero frequency carrier wave or the analog if signal of low frequency carrier wave again, the frequency mixer of the output signal of first order module by second level module further by carrier frequency step-down by filtering, amplify, after analog to digital conversion, output to baseband processing module or second level module directly by the filtering of first order output signal, amplify, after analog to digital conversion, output to baseband processing module, baseband processing module is processed Low Medium Frequency or zero intermediate frequency digital signal, realize final location and navigation.
Described single-chip dual-frequency global satellite navigation receiver, it is that every grade of module in the two-rank module of described receiving cable all can be configured to the circuit structure of different mode, first order block configuration becomes to be used for realizing radio frequency and amplifies and frequency transformation, first order block configuration becomes for realizing the circuit of radio frequency amplification and frequency transform function, second level module can be disposed for realizing frequency transformation, signal filtering, signal amplifies and the circuit of analog-digital conversion function, or is configured as the circuit of signal filtering, signal amplification and analog-digital conversion function.
Described single-chip dual-frequency global satellite navigation receiver, its output local frequency that is described frequency synthesizer module is to change within the specific limits: the frequency range of two frequency synthesizer module output local oscillators is not identical, the whole satellite navigation signals frequency range of frequency coverage of first frequency synthesizer, for 1.10GHz is to 1.61GHz; The frequency of second frequency synthesizer is much smaller than first frequency synthesizer, for 150MHz is to 220MHz.
It is exactly that signal in band is not evenly distributed on frequency spectrum that GNSS signal has an important feature, but concentrate, be distributed in several intervals, L1, L2 for GPS, the E5a of Galileo, E5b, the L2 of GLONASS, the central frequency distribution of their signals, in 1176.45～1248.625MHz frequency range, is referred to as I district; The L1 midband frequency of the E2-L1-E1 of Galileo and GPS is all 1575.42MHz, is called II district, and the independent III of the L1 wave band district of GLONASS, central frequency range is 1598.0625～1605.375MHz.
Fig. 2 is global navigation satellite signal spectrum distribution plan.From the distance in DaoII district, I district, be 326.795～398.97MHz, distance 22.6425～the 29.955MHz in DaoIII district, II district, the distance in DaoIII district, I district is 349.4375～428.925MHz, and has following characteristics: the distance in DaoII district, I district and I district are substantially close to the distance of III.If by two passages of I YuII district's signal or I YuIII district signal difference input receiver, and in the time of near half that to meet first order IF-FRE be both distances, two passages can adopt same local oscillation circuit, same reason, when first order IF-FRE WeiII district to III offset from half near time, II and III can realize receptions simultaneously by two passages of receiver.
Global navigation satellite receiver need to be realized and receive I YuII district's signal or I YuIII district signal simultaneously, and whole receiver is integrated on one single chip.
The composition structure of monolithic global navigation satellite receiver comprises two independent receiving cables, two frequency synthesizers and baseband processing module.Each receiving cable circuit structure comprises first order module, second level module.In first order module, there is radio frequency amplifier, frequency mixer, and LC wave filter; Second level module has intermediate frequency amplifier and frequency mixer, configurable wave filter (PPF/LPF), and gain amplifier and A-D converter form.Baseband processing module is used for processing the signal of two receiving cables after analog to digital conversion simultaneously, realizes final location and navigation.Sheet outside antenna receive send here the radiofrequency signal that contains high-frequency carrier wave of satellite launch, first through the radio frequency amplifier in first order module, signal is amplified, by frequency mixer, be converted into the analog baseband signal of zero frequency carrier wave or the analog if signal of low frequency carrier wave again, the frequency mixer of the output signal of first order module by second level module further by carrier frequency step-down by filtering, amplify, after analog to digital conversion, output to baseband processing module or second level module directly by the filtering of first order output signal, amplify, after analog to digital conversion, output to baseband processing module.
First receiving cable is called A channel, and second receiving cable is called B passage, and B channel module and processing capacity thereof are identical with A channel.Two frequency synthesizers produce respectively two local oscillation signals, and correspondence offers two independent A channel modules that receive and B channel module for mixing, therefore can reduce spuious the influencing each other of frequency between two independent receiving cables.Each receiving cable adopts configurable receiver structure, according to different satellite-signals, can receiver be configured to Low Medium Frequency by digital interface, the two mapped structures of zero intermediate frequency and superhet, when being operated in Low Medium Frequency, after the frequency mixer of first order module amplifies signal by radio frequency amplifier, by frequency mixer, input signal is transformed to Low Medium Frequency again, second level module is carried out filtering by the output signal of first order module, the configurable filter that completes filter function is operated in complex filter pattern, configurable filter is to image signal, the useful letter that is another receiving cable suppresses, after filtered signal amplifies by gain amplifier again, through A-D converter, convert digital signal output to.When being operated in zero intermediate frequency pattern, signal path is the same with Low Medium Frequency pattern, with the difference of Low Medium Frequency pattern be that configurable filter is operated in low-pass filter pattern.When being operated in superhet pattern, after the frequency mixer of first order module amplifies signal by radio frequency amplifier, by frequency mixer, input signal is transformed to intermediate-freuqncy signal, because IF-FRE is high, can pass through LC wave filter filtering image signal, then, through the filtered signal of LC, output to second level module, second level module converts the signal into zero carrier frequency or low carrier frequency, now, configurable filter is operated in low pass pattern or complex filter pattern, signal is by after low-pass filtering, by gain amplifier, zero carrier frequency or low carrier frequency signal are amplified again, by analog to digital conversion signal, converting digital signal to exports.
And each receiving cable adopts the changeable LNA input of 1.2/1.5～1.6GHz wave band, therefore can realize the reception to all GNSS signals.When receiver receives I YuII district signal, receive the image signal WeiII district signal of I district signal receiving cable, therefore need to suppress II district signal, the image signal that receives II district signal receiving cable is I district signal, therefore need to suppress I district signal.In like manner, when receiving I YuIII district signal, two receiving cables need to suppress the signal of another receiving cable.
The frequency of each frequency synthesizer in described two frequency synthesizers is to change within the specific limits:
The frequency range of first frequency synthesizer output local oscillator is from 1.10GHz to 1.61GHz;
The frequency range of second frequency synthesizer output local oscillator is from 150MHz to 220MHz.
This receiver can adopt CMOS technique to be integrated in same chip.
Substantial effect of the present invention is:
1, by two receiving cables of shared frequency compositor, realized the reception of all global navigation satellite signals, receiver can be operated in four kinds and receive signalling channel pattern, the configuration of various patterns is to be completed by SPI digital interface 418 integrated on sheet by external microcontroller, circuit hardware cost is low, simple in structure, flexible configuration.
2, two independent receiving cables and two local oscillator LO1 and LO2, therefore not only reduced the area that receiver takies chip, reduces spuious the influencing each other of frequency between two independent receiving cables simultaneously, has good receptivity.
3, each receiving cable adopts configurable receiver structure, according to different satellite-signals, be configured to the two mapped structures of Low Medium Frequency, zero intermediate frequency and superhet, and each receiving cable adopts the changeable LNA input of 1.2/1.5～1.6GHz wave band, therefore can realize the reception to all GNSS signals.
4, two receiving cables, in being integrated in same chip, have reduced the power consumption of dual-frequency receiver.
5, can adopt the integrated whole receiver circuit of CMOS technique single-chip, meet the application demand of high-performance GNSS receiver.
Accompanying drawing explanation
Fig. 1 is traditional dual-frequency global satellite navigation receiver.
Fig. 2 is global navigation satellite signal spectrum distribution plan.
Fig. 3 is the theory diagram that the present invention is based on the single-chip double frequency satellite navigation receiver of shared frequency compositor.
Fig. 4 is the circuit theory diagrams of the single-chip double frequency satellite navigation receiver of the present invention's the first embodiment based on shared frequency compositor.
Fig. 5 is that each receiving cable of second embodiment of the invention is configured to Low Medium Frequency, zero intermediate frequency reciver receive channel signal flow diagram.
Fig. 6 is the two conversion of third embodiment of the invention superhet Low Medium Frequency, zero intermediate frequency reciver receive channel signal flow diagram.
Embodiment
The present invention is based on the theory diagram of the single-chip dual-frequency global satellite navigation receiver of shared frequency compositor, as shown in Figure 3.Monolithic dual-frequency global satellite navigation receiver of the present invention is integrated on one single chip, is arranged on global navigation satellite receiver, realizes and receives I YuII district's signal or I YuIII district signal simultaneously.Whole receiver is comprised of two independent receiving cables, two frequency synthesizers and baseband processing module.A receiving cable is comprised of A channel first order module 301 and A channel second level module 302, the RF input signal of antenna reception, input A channel first order module 301 input ends, by the first order module 301 and second level module 302 modules that are connected in series, radiofrequency signal is amplified, and be converted into the analog baseband signal of zero frequency carrier wave or the analog if signal of low frequency carrier wave, by 302 modules, signal is exported to the A road input end of baseband processing module 307, by analog to digital converter, analog baseband signal and analog if signal are converted into digital baseband signal and digital medium-frequency signal again.B receiving cable is comprised of the B passage first order module 305 being connected in series and B passage second level module 306,305 modular circuit structures are identical with 301 modules, 306 modular circuit structures are identical with 302 modules, the RF input signal of antenna reception is from B passage first order module 305, output signal is from the B road input end of B passage second level module 306 Shu Chu Give baseband processing modules 307, and processing capacity is identical with A channel.First frequency compositor 303 produces local oscillation signal LO1, and second frequency compositor 304 produces local oscillation signal LO2.The frequency range of first frequency synthesizer 303 output local oscillator LO1 is from 1.1GHz to 1.61GHz, and the frequency range of second frequency synthesizer 304 output local oscillator LO2 is from 150MHz to 220MHz.Two local oscillator LO1 and LO2 offer each independent receiving cable, therefore can reduce spuious the influencing each other of frequency of each independent receiving cable.Each receiving cable adopts configurable receiver structure, according to different satellite-signals, be configured to the two mapped structures of Low Medium Frequency, zero intermediate frequency and superhet, and each receiving cable adopts the changeable LNA input of 1.2/1.5～1.6GHz wave band, therefore can realize the reception to all GNSS signals.When receiver receives I YuII district signal, receive the image signal WeiII district signal of I district signal receiving cable, therefore need to suppress II district signal, the image signal that receives II district signal receiving cable is I district signal, therefore need to suppress I district signal.In like manner, when receiving I YuIII district signal, two receiving cables need to suppress the signal of another receiving cable.
Accompanying drawing is also described in further detail technical scheme of the present invention in conjunction with the embodiments below.
The first embodiment
The circuit theory diagrams of the single-chip double frequency satellite navigation receiver of the present invention's the first embodiment based on shared frequency compositor, as shown in Figure 4.Single-chip double frequency satellite navigation receiver is by two independently A receiving cables 41 and B receiving cable 42, and first frequency frequency synthesizer 43-1 and second frequency frequency synthesizer 43-2 and baseband processing module 44 form.A receiving cable 41 is comprised of A channel first order module 41-1 and A channel second level module 41-2.A channel first order module is by LNA401, mixer 402,404 and 405, and quadrature phase circuit 403 and if bandpas filter 406 form.Wherein 402 and 404 is orthogonal mixer, and the local oscillation signal L01 that frequency synthesizer 43-1 produces gives orthogonal mixer 402 and 404 after being processed by quadrature phase circuit 403.A channel second level module is by intermediate frequency amplifier 407, orthogonal mixer 408 and 410, and configurable filter 411, variable gain amplifier 412 and 414, quadrature phase circuit 409 and analog to digital conversion circuit 413 and 415 cascades form.Wherein 410 and 408 is orthogonal mixer, and the local oscillation signal L02 that frequency synthesizer 43-2 produces gives orthogonal mixer 408 and 410 after being processed by quadrature phase circuit 409.Configurable filter 411 can be configured as low-pass filter or complex filter.Analog to digital conversion circuit 413 and 415 adopts four bit outputs, and baseband processing module 44 is delivered in the analog to digital conversion circuit 413 of A receiving cable 41 and 415 output.
B receiving cable 42 circuit structures and A receiving cable 41 are just the same.Wherein B passage first order mould 42-1 is by 419,420, and 421,422,423,425 form, and B passage second level module 42-2 is by 424,426, and 427,428,429,430,431,432,433 form.
Two local oscillator LO1 that two independent receiving cables of A and B share that first frequency frequency synthesizer 43-1 and second frequency frequency synthesizer 43-2 produce and LO2, therefore can reduce spuious the influencing each other of frequency between two independent receiving cables.Each receiving cable adopts configurable receiver structure, according to different satellite-signals, be configured to the two mapped structures of Low Medium Frequency, zero intermediate frequency and superhet, and each receiving cable adopts the changeable LNA input of 1.2/1.5～1.6GHz wave band, therefore can realize the reception to all GNSS signals.
Module 404,409,422,427 functions in A channel and B passage are identical, are all that the orthogonal signal that single channel local oscillation signal is become to phase phasic difference 90 degree offer frequency mixer.
Each receiving cable of receiver structure shown in Fig. 4 not only can be configured to above-mentioned three kinds of receiver structures, and, can be operated in four kinds of receiving modes: low intermediate frequency receiver receiving mode, zero intermediate frequency reciver receiving mode, superhet double conversion receiver Low Medium Frequency output mode and superhet double conversion receiver zero intermediate frequency output mode, in every kind of receiver mode, for receiving cable inner module, only have the module that signal passes through to work, other module is in closed condition.Because two receiving cables are identical, below take one of them passage A and describe the reception programme of every kind of receiving mode in detail as example.
Low intermediate frequency receiver receiving mode, zero intermediate frequency reciver receiving mode, the receiving cable of superhet double conversion receiver Low Medium Frequency output mode and four kinds of receiving modes of superhet double conversion receiver zero intermediate frequency output mode forms, the signalling channel pattern configurations of take is example, and another signalling channel can configure equally.
(1) low intermediate frequency receiver receiving mode
The A receiving cable information flow diagram of the low intermediate frequency receiver pattern that is configured to of second embodiment of the invention, as shown in Figure 5.This Mode A passage first order module is by LNA low noise amplifier 401, Mixer orthogonal mixer 402 and 404 and orthogonal local oscillation generation module 403 form.This Mode A passage second level module is by PPF/LPF configurable filter 411, VGA variable gain amplifier 412 and 414 and ADC analog to digital conversion adc circuit 413 and 415 form.LNA401 selects corresponding working frequency range according to GNSS signal in band, and configurable filter 411 is configured to PPF complex filter.The signalling channel signal stream of this Mode A passage is: input signal amplifies through LNA 401 (BA0), amplifying signal dispensing Mixer orthogonal mixer 402 (BA1B) and 404 (BA1A), corresponding orthogonal local oscillation LO1 mixing of exporting with orthogonal local oscillation generator 403, PPF configurable filter 411 (BA5) complex filter is sent in two-way mixing output, and two-way complex filter output correspondence is sent VGA412 (BA6A) and ADC413 (BA7A) and VGA414 (BB6A) and ADC415 (BA7A).Due to I in low intermediate frequency receiver, Q two-way all contains identical intermediate-freuqncy signal, and just quadrature in phase, therefore, can select any road to export to baseband processing module 44 after configurable filter 411 filtering.
(2) zero intermediate frequency reciver receiving mode
The A receiving cable information flow diagram of zero intermediate frequency reciver receiving mode, as shown in Figure 5.Module and the low intermediate frequency receiver pattern of this mode signal path process are just the same, only have the configuration of module different, configurable filter 411 these pattern configurations of second level module become LPF low-pass filter, real part and imaginary part because zero intermediate frequency I, Q two-way are complex base band signal therefore must adopt quadrature two-way to export simultaneously.
(3) superhet double conversion receiver Low Medium Frequency output mode
The A receiving cable information flow diagram of the superhet double conversion receiver Low Medium Frequency output mode of third embodiment of the invention, as shown in Figure 6.This pattern adopts two-stage analog intermediate frequency structure, and A receiving cable first order module is by low noise amplifier 401, and the outer LC BPF if bandpas filter 406 of single channel frequency mixer 405 and sheet forms.A receiving cable second level module is by IFA intermediate frequency amplifier 407, orthogonal mixer MirerQ408 and MirerI410, orthogonal local oscillation generator 409, configurable filter 411, VGA variable gain amplifier 412 and 414 and ADC analog to digital conversion circuit 413 and 415 form.First order frequency mixer adopts single channel output, and outside sheet, LC if bandpas filter 406 filtering intermediate frequency intermodulation clutter interference, also further to being with undesired signal outside outer input tape to suppress, are inputted orthogonal mixer 408 and 410 after intermediate frequency amplifier 407 further amplifies.Configurable filter 411 is configured to complex filter, quadrature I, Q two paths of signals are through being configured to after configurable filter 411 complex filters and image signal inhibition of complex filter, I, Q two paths of signals further amplify by corresponding VGA variable gain amplifier 412 and 414 again, after ADC 413 and 415 samplings, adopt quadrature I, Q two railway digital outputs.
The signalling channel signal stream of this Mode A passage is: input signal amplifies through LNA 401 (BA0), amplifying signal dispensing Mixer orthogonal mixer 405 (BA2), corresponding orthogonal local oscillation LO1 mixing of exporting with orthogonal local oscillation generator 403, one tunnel mixing output send sheet outer LC BPF bandpass filter 406 filtering, IFA intermediate frequency amplifier 407 is sent in bandpass filtering output, intermediate frequency amplifies output minute I and Q two-way, correspondence is sent MixerI orthogonal mixer 410 (BA4A) and MixerQ orthogonal mixer 408 (BA4B), corresponding orthogonal local oscillation LO2 mixing of exporting with orthogonal local oscillation generator 409, PPF configurable filter 411 (BA5) complex filter is sent in I and Q two-way mixing output, two-way complex filter output correspondence send VGA412 (BA6A) gain to amplify and ADC413 (BA7A) analog to digital conversion and VGA414 (BB6A) gain amplification and ADC415 (BA7A) analog to digital conversion.Due to I in low intermediate frequency receiver, Q two-way all contains identical intermediate-freuqncy signal, and just quadrature in phase, therefore, can select any road to export to baseband processing module 44 after configurable filter 411 filtering.
(4) the two conversion of superhet zero intermediate frequency output mode
The A receiving cable information flow diagram of superhet double conversion receiver zero intermediate frequency output mode, as shown in Figure 6.This pattern is the same with the pattern that the output of the two conversion of superhet Low Medium Frequency adopts.With the two conversion of superhet Low Medium Frequency output mode differences be: after the frequency transformation for the second time of this pattern, be output as zero intermediate frequency baseband signal, so configurable filter 411 is configured to LPF low-pass filter, baseband signal adopts I, Q two-way to export simultaneously.
The local oscillator LO1 that two receiving cables are shared and LO2 respectively by two independently frequency synthesizer 1 and frequency synthesizer 2 produce, spuious for reducing frequency, two frequency synthesizers 416 and 417 share same input reference clock circuit OSC.
The configurable receiving mode of the present invention is a lot, different receiving modes, the function difference of module, no longer one by one tired stating.
In sum, because whole receiver adopts configurable setting, not only receiver signal channel architecture is configurable, and channel interior frequency mixer, and the function of wave filter is configurable.The configuration of the various patterns of receiver is to be completed by integrated SPI digital interface 418 on sheet by external microcontroller.Changeable to the receiving wave range of LNA low noise amplifier by SPI digital interface, selection to frequency mixer, is configured to PPF or LPF to configurable filter 411, and two-way VGA is amplified and analog-to-digital selection, realize the configuration of channel signal stream, make receiver can be operated in four kinds of receiving modes.
The above; it is only the detailed description that realizes the specific embodiment of the invention of instructions description of the present invention and graphic; for illustration and unrestricted; but feature of the present invention is not limited to this; those skilled in the art obviously understand; all scopes of the present invention should be as the criterion with the protection domain of its claim; do not deviating under the prerequisite of invention spirit that appended claims defines and invention scope; other embodiment that the variation similar with it of all spirit according to the present invention implemented, all should be included among protection category of the present invention.
Claims (5)
1. a single-chip dual-frequency global satellite navigation receiver, its formation comprises:
(1) A receiving cable is receiving cable independently;
(2) B receiving cable is receiving cable independently;
(3) frequency synthesizer 1, for A receiving cable and B receiving cable provide local frequency LO1;
(4) baseband processing module;
It is characterized in that: it forms and also to comprise frequency synthesizer 2, for A receiving cable and B receiving cable provide local frequency LO2;
Described A receiving cable comprises A channel first order module and the A channel second level module being connected in series; The input end access 1.1-1.2/1.5-1.6GHz radio-frequency input signals RF of A channel first order module, the output terminal of A channel second level module is received baseband processing module;
Described B receiving cable comprises B passage first order module and the B passage second level module being connected in series; The input end access 1.1-1.2/1.5-1.6GHz radio-frequency input signals RF of B passage first order module, the output terminal of B passage second level module is received baseband processing module;
Described frequency synthesizer 1 output terminal LO1 connects the local oscillation signal input end of A channel first order module and B passage first order module;
Described frequency synthesizer 2 output terminal LO2 connect the local oscillation signal input end of A channel second level module and B passage second level module;
Each receiving cable of described two receiving cables is configurable receiving cable circuit structure, for according to different satellite-signals, is configured to a kind of circuit structure in the two circuit structures that convert of Low Medium Frequency, zero intermediate frequency and superhet;
Two receiving cable basis signal configurations of described A and B receive respectively the global navigation satellite signal of different frequency range, realize the function of the global navigation satellite signal that simultaneously receives two frequency ranges; Two receiving cables share same frequency compositor, than traditional double frequency global navigational satellite receiver, save two frequency synthesizers;
Two input ends of described baseband processing module connect the output terminal of A and two receiving cables of B, each input end signal is Low Medium Frequency or the zero intermediate frequency digital signal after receiving cable frequency conversion, filtering, amplification, analog to digital conversion, through baseband processing module, processes and realizes location and navigation;
The two-way satellite navigation signals that two receiving cables of described A and B receive is image signal each other, and wherein, each road receiving cable is realized the inhibition to another road image signal by complex filter in sheet outer filter or sheet;
Described dual-frequency global satellite navigation receiver is integrated on same chip.
2. single-chip dual-frequency global satellite navigation receiver according to claim 1, is characterized in that, described configurable receiving cable circuit structure comprises first order module, second level module, in first order module, there is radio frequency amplifier, frequency mixer, and LC wave filter, second level module is comprised of intermediate frequency amplifier and frequency mixer, configurable wave filter, gain amplifier and A-D converter, sheet outside antenna receive send here the radiofrequency signal that contains high-frequency carrier wave of satellite launch, the changeable LNA low noise amplifier of input wave band in first order module amplifies signal, through frequency mixer, be converted into the analog baseband signal of zero frequency carrier wave or the analog if signal of low frequency carrier wave, the output signal of first order module by the frequency mixer of second level module by carrier frequency step-down by filtering, amplify, after analog to digital conversion, output to baseband processing module or second level module directly by the filtering of first order output signal, amplify, after analog to digital conversion, output to baseband processing module, baseband processing module is processed Low Medium Frequency or zero intermediate frequency digital signal, realize location and navigation.
3. according to single-chip dual-frequency global satellite navigation receiver described in claim 1 or 2, it is characterized in that, every grade of module in the two-rank module of described receiving cable all can be configured to the circuit structure of different mode, first order block configuration becomes for realizing the circuit of radio frequency amplification and frequency transformation, second level module can be disposed for realizing frequency transformation, signal filtering, signal amplification and analog-to-digital circuit, or is configured as signal filtering, signal amplification and analog-to-digital circuit.
4. according to single-chip dual-frequency global satellite navigation receiver described in claim 1 or 2, it is characterized in that, the output local frequency of described frequency synthesizer is to change within the specific limits: the frequency range of two frequency synthesizer output local oscillators is not identical, the whole satellite navigation signals frequency range of frequency coverage of first frequency synthesizer, for 1.10GHz is to 1.61GHz; The frequency of second frequency synthesizer is much smaller than first frequency synthesizer, for 150MHz is to 220MHz.
5. single-chip dual-frequency global satellite navigation receiver according to claim 3, it is characterized in that, the output local frequency of described frequency synthesizer is to change within the specific limits: the frequency range of two frequency synthesizer module output local oscillators is not identical, the whole satellite navigation signals frequency range of frequency coverage of first frequency synthesizer, for 1.10GHz is to 1.61GHz; The frequency of second frequency synthesizer is much smaller than first frequency synthesizer, for 150MHz is to 220MHz.
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| EP3105856A4 (en) * | 2014-02-12 | 2017-09-13 | Telefonaktiebolaget LM Ericsson (publ) | Method and arrangements in multi-band receivers |
| CN108196272A (en) * | 2017-12-29 | 2018-06-22 | 中国电子科技集团公司第二十研究所 | A kind of satellite navigation positioning device and method based on real-time accurate One-Point Location |
| CN112424629B (en) * | 2018-06-26 | 2024-04-09 | 苏州宝时得电动工具有限公司 | Electric device using radar |
| CN111123319B (en) * | 2019-12-31 | 2022-04-22 | 泰斗微电子科技有限公司 | Satellite positioning device, satellite signal receiver and terminal equipment |
| CN111245450A (en) * | 2020-03-13 | 2020-06-05 | 华为技术有限公司 | Intelligent wearable device |
| CN111538047B (en) * | 2020-04-30 | 2022-04-19 | 杭州中科微电子有限公司 | Radio frequency front end structure applied to GNSS double-frequency receiver |
| CN111610543B (en) * | 2020-06-23 | 2023-08-22 | 湖南国科微电子股份有限公司 | Low-power consumption processing method, device, positioning system and storage medium |
| CN117767972A (en) * | 2022-09-16 | 2024-03-26 | 华为技术有限公司 | Terminal equipment |
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Denomination of invention: A Single Chip Dual Frequency Global Satellite Navigation Receiver Granted publication date: 20141029 Pledgee: Bank of China Limited Hangzhou Binjiang Branch Pledgor: Hangzhou Zhongke Microelectronics Co.,Ltd. Registration number: Y2024330000631 |
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