CN107347190A - A kind of high-speed railway satellite TV signal relay coverage system - Google Patents
A kind of high-speed railway satellite TV signal relay coverage system Download PDFInfo
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- CN107347190A CN107347190A CN201710600425.XA CN201710600425A CN107347190A CN 107347190 A CN107347190 A CN 107347190A CN 201710600425 A CN201710600425 A CN 201710600425A CN 107347190 A CN107347190 A CN 107347190A
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- signal
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- modular converter
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/18—Network planning tools
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/26—Cell enhancers or enhancement, e.g. for tunnels, building shadow
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Relay Systems (AREA)
Abstract
The invention discloses a kind of high-speed railway satellite TV signal relay coverage system, including the outdoor unit being arranged on outside signal covering shadow region and the relay unit being arranged in signal covering shadow region, the outdoor unit includes satellite TV signal access antenna, down conversion module, work(divides amplification module, electrical/optical modular converter, the relay unit is provided with optical electrical modular converter, up-converter module and relaying signal covering antenna, the satellite TV signal access antenna divides amplification module correspondingly to connect the electrical/optical modular converter by the down conversion module and the work(, the electrical/optical modular converter of outdoor unit correspondingly connects the optical electrical modular converter of relay unit, the optical electrical modular converter correspondingly connects the relaying signal by the up-converter module and covers antenna.The system cost is low, need not require that train sets up relaying signal receiver, will not be interfered with wireless signal in train and be applicable to long tunnel signal covering shadow region.
Description
Technical field
The present invention relates to signal to relay Covering domain, especially a kind of high-speed railway satellite TV signal relaying covering system
System.
Background technology
High-speed railway (hereinafter referred to as high ferro) has become one of major way of common people's trip at present, passes through high ferro train
Vehicular satellite TV receiving system provides TV services for passenger and has become lifting high ferro trip experience, enriches passenger trip
The important way of way entertainment life.But weak area can not be covered or covered in satellite TV signals such as tunnel, bridge, mountain valleys
Domain, high ferro Vehicular satellite TV receiving system will be unable to effectively receive direct satellite television broadcasing signal, cause high ferro train to be come on TV
Program service is interrupted or image quality is difficult to meet that viewing requires.
In order to solve high ferro train satellite TV signal can not cover or cover weak region (can be collectively referred to as signal covering
Shadow region) radio TV signals receiving problem, using signal relay covering method satellite TV signal is forwarded to these regions
It is a kind of effective method to be received for the train-installed satellite television receiving system of high ferro.Due to the vast central and west regions in China
Based on mountain region, cause along high ferro satellite TV signal covering shadow region more, high ferro will be had a strong impact in these areas
Trip experience, therefore be extremely necessary to study high ferro satellite TV signal relaying covering method.
The method of existing high ferro tunnel satellite TV signal relaying covering, has been summed up two categories below：(1) satellite electricity
Covering scheme is relayed depending on signal not frequency conversion, i.e. satellite TV signal its signal frequency after relay system is constant, still with satellite
TV downstream frequency is to the train-installed satellite television receiving system forward signal of high ferro；(2) satellite TV signal frequency conversion relaying covers
Lid scheme, i.e. satellite TV signal its signal frequency after relay system are converted to designated frequency band, then vehicle-mounted are connect to special
Enter device forwards signal.
Subject matter existing for the above-mentioned high ferro satellite TV signal relaying covering method being currently known has：(1) not frequency conversion
Relaying covering scheme needs additionally to increase antenna, it is necessary to transform train in high ferro train head, in addition, the program is difficult to
The region longer applied to shadow regions such as long tunnels；(2) frequency conversion relaying covering scheme needs under high frequency satellite TV signal to become
Frequency then again sends the satellite TV signal after frequency conversion to shadow regions such as tunnels to ISM band (such as 2.4GHz or 5.8GHz)
Covering, program subject matter is complexity height, it is necessary to which special configuration adapts to the signal reception of ISM band on high ferro train
Equipment, additionally due to using ISM band, it is possible to co-channel interference be present with the ISM band wireless device of configuration inside train
Risk.
The content of the invention
The technical problems to be solved by the invention are：For above-mentioned problem, there is provided a kind of without increasing ON TRAINS
If what is relayed signal receiver and will not be interfered with wireless signal in train is applicable to the covering of long tunnel signal
The high-speed railway satellite TV signal relay coverage system in shadow region.
The technical solution adopted by the present invention is as follows：
A kind of high-speed railway satellite TV signal relay coverage system, specifically include and be arranged on outside signal covering shadow region
Outdoor unit and the relay unit being arranged in signal covering shadow region, the outdoor unit include satellite TV signal access day
Line, down conversion module, work(divide amplification module, electrical/optical modular converter, and the relay unit is provided with optical electrical modular converter, upper change
Frequency module and relaying signal covering antenna, the satellite TV signal access antenna pass through the down conversion module and the work(point
Amplification module correspondingly connects the electrical/optical modular converter, and the electrical/optical modular converter of outdoor unit correspondingly connects relay unit
Optical electrical modular converter, the optical electrical modular converter correspondingly connect the relaying signal by the up-converter module and cover day
Line.
Further, the down conversion module is used to satellite TV signal downconverting to 900-1500MHz.
Further, the up-converter module is used for before the satellite TV signal frequency after down coversion is amplified into down coversion
Primary frequency.
Further, the work(divides amplification module to be used for N times of satellite TV signal power amplification after down coversion and incited somebody to action
The satellite TV signal of N times of power amplification is divided into N roads, and N is the number that signal covers relay unit in shadow region.
Further, the electrical/optical modular converter is used to satellite TV signal being converted to optical signal, and the optical electrical turns
Mold changing block is used to the optical signal being converted to satellite TV signal.
Further, the spacing of the relay unit is 450-550m.
In summary, by adopting the above-described technical solution, the beneficial effects of the invention are as follows compared to existing satellite television
Signal relays covering scheme, directly receives relaying signal using Vehicular satellite TV access device, increases without extra ON TRAINS
If relaying signal receiver, the complexity of mobile unit is reduced, is advantageous to control device cost；Suitable for long tunnel signal
The satellite TV signal covering of the shade area of coverage；In the absence of the risk interfered with wireless signal in train.
Brief description of the drawings
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein：
Fig. 1 is satellite TV signal relay coverage system structure chart provided in an embodiment of the present invention
Embodiment
All features disclosed in this specification, or disclosed all methods or during the step of, except mutually exclusive
Feature and/or step beyond, can combine in any way.
Any feature disclosed in this specification, unless specifically stated otherwise, can be equivalent by other or with similar purpose
Alternative features are replaced.I.e., unless specifically stated otherwise, each feature is an example in a series of equivalent or similar characteristics
.
Fig. 1 is satellite TV signal relay coverage system structure chart provided in an embodiment of the present invention, as shown in figure 1, a kind of
High-speed railway satellite TV signal relay coverage system, specifically include the outdoor unit being arranged on outside signal covering shadow region and set
The relay unit in signal covering shadow region is put, the outdoor unit includes satellite TV signal access antenna, down coversion mould
Block, work(divide amplification module, electrical/optical modular converter, the relay unit be provided with optical electrical modular converter, up-converter module and in
Antenna is covered after signal, the satellite TV signal access antenna divides amplification module pair by the down conversion module and the work(
The electrical/optical modular converter should be connected, the electrical/optical modular converter of outdoor unit correspondingly connects the optical electrical modulus of conversion of relay unit
Block, the optical electrical modular converter correspondingly connect the relaying signal by the up-converter module and cover antenna.
The satellite TV signal that the satellite TV signal access antenna access frequency is 11.7-12.2GHz；The lower change
Satellite TV signal is downconverted to 900-1500MHz by frequency module；The work(divides amplification module to be used for defending 900-1500MHz
Star television signal power amplifies N times and the satellite TV signal of N times of power amplification is divided into N roads, and N is in signal covering shadow region
The number of relay unit；N roads 900-1500MHz satellite TV signal is converted to N roads light letter by the electrical/optical modular converter
Number, and N roads optical signal is transmitted separately to the optical electrical modular converter of N number of relay unit in the signal shade area of coverage；Optical electrical
Modular converter is converted to the N roads optical signal received N roads 900-1500MHz satellite TV signal；Up-converter module is by under
Satellite TV signal frequency after frequency conversion is amplified to the primary frequency before down coversion, i.e., by 900-1500MHz satellite TV signal
Up-conversion to 11.7-12.2GHz satellite TV signal；Signal covering antenna is relayed by N roads 11.7-12.2GHz satellite electricity
Launch depending on signal.
It can determine that signal shade covers intra-area trunking list using propagation path loss of the satellite TV signal in tunnel
The interval of member, the spacing through analyzing relay unit in Chinese Industrial Standards (CIS) high ferro tunnel typically take 450-550m.Assuming that in tunnel
It is 0.5km after unit interval, erection tunnel total length is l km, then the number of relay unit is that N=(l ÷ 0.5) is individual.
The ERP EIRP of relay unit can be determined according to the performance of Vehicular satellite TV signal access deviceREP
With the carrier-to-noise ratio parameter [C/T] of outdoor unitG, it is assumed that the major parameter of Vehicular satellite TV signal receiving apparatus has：Comprehensive solution
The receiving sensitivity P of code receiverminDBm, vehicle-mounted low-noise amplifier gain are GLNADB, cab signal reception antenna
Gain is GANTDBi, the carrier-to-noise ratio of Vehicular satellite TV signal access device are [C/T]TRAIN, then the equivalent radiated power of relay unit
Power EIRPREP=Pmin-GLNA-GANT+ L (dBm), wherein L is between relay unit and Vehicular satellite TV signal receiving apparatus
Path loss, computational methods are：L=32.44+20 × log (d)+20 × log (f) (db), wherein d are wave path
Length, unit km；F be electromagnetic wave working frequency, unit MHz.Can be according to relay unit spacing in Practical Project
0.5km is calculated, then+20 × log of L=32.44+20 × log (0.5) (12200)=108.1db.
The current direct satellite television broadcasing satellite in China only has culminant star 9, and it uses ABS-S technical specifications, and culminant star 9 is live to be defended
Star uses ABS-S Transmission systems, and its Eb/N0 thresholding is 3.5-4dB, 4dB is taken in engineering, according to formulaIts
Middle Rb is signal code check, and its value is symbol rate × 188/204 × interior coding rate × 2, Rb=10lg (28.8 × 106×188/204
× 3/4 × 2)=76dBHz, k are Boltzmann constant, k=-228.6dBJ/K.Obtain the carrier-to-noise ratio requirement of whole relay system
[C/T]TOT, according to the carrier-to-noise ratio formula of link cascade：Outdoor unit can be drawn
The carrier-to-noise ratio parameter [C/T] of unitG.EIRP is launched according to relay unitREPWith the carrier-to-noise ratio parameter [C/T] of outdoor unitGCarry out
Link decomposes, and is decomposed according to link, selects suitable radio frequency, optoelectronic device structure relay system.
The invention is not limited in foregoing embodiment.The present invention, which expands to, any in this manual to be disclosed
New feature or any new combination, and disclose any new method or process the step of or any new combination.
Claims (6)
1. a kind of high-speed railway satellite TV signal relay coverage system, it is characterised in that including being arranged on signal covering shadow region
Outer outdoor unit and the relay unit being arranged in signal covering shadow region, the outdoor unit connect including satellite TV signal
Enter antenna, down conversion module, work(and divide amplification module, electrical/optical modular converter, the relay unit be provided with optical electrical modular converter,
Up-converter module and relaying signal covering antenna, satellite TV signal access antenna pass through the down conversion module and described
Work(divides amplification module correspondingly to connect the electrical/optical modular converter, and the electrical/optical modular converter of outdoor unit correspondingly connects relay unit
Optical electrical modular converter, the optical electrical modular converter by the up-converter module correspondingly connect it is described relaying signal cover day
Line.
2. a kind of high-speed railway satellite TV signal relay coverage system according to claim 1, it is characterised in that described
Down conversion module is used to satellite TV signal downconverting to 900-1500MHz.
3. a kind of high-speed railway satellite TV signal relay coverage system according to claim 1, it is characterised in that described
Up-converter module is used to for the satellite TV signal frequency after down coversion to be amplified to the primary frequency before down coversion.
4. a kind of high-speed railway satellite TV signal relay coverage system according to claim 1, it is characterised in that described
Work(divides amplification module to be used for by N times of satellite TV signal power amplification after down coversion and by the satellite television of N times of power amplification
Signal is divided into N roads, and N is the number that signal covers relay unit in shadow region.
5. a kind of high-speed railway satellite TV signal relay coverage system according to claim 1, it is characterised in that described
Electrical/optical modular converter is used to satellite TV signal being converted to optical signal, and the optical electrical modular converter is used for the optical signal
Be converted to satellite TV signal.
6. a kind of high-speed railway satellite TV signal relay coverage system according to claim 1, it is characterised in that described
The spacing of relay unit is 450-550m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710600425.XA CN107347190A (en) | 2017-07-21 | 2017-07-21 | A kind of high-speed railway satellite TV signal relay coverage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710600425.XA CN107347190A (en) | 2017-07-21 | 2017-07-21 | A kind of high-speed railway satellite TV signal relay coverage system |
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| Publication Number | Publication Date |
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| CN107347190A true CN107347190A (en) | 2017-11-14 |
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| CN201710600425.XA Pending CN107347190A (en) | 2017-07-21 | 2017-07-21 | A kind of high-speed railway satellite TV signal relay coverage system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109257083A (en) * | 2018-10-22 | 2019-01-22 | 中国电子科技集团公司第二十九研究所 | The compound relay transmission method of satellite-signal integration of high-speed rail tunnel area |
| CN110187368A (en) * | 2019-06-24 | 2019-08-30 | 中国电子科技集团公司第二十九研究所 | Doppler shift processing method between low orbit satellite and ground based terminal |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0724339A2 (en) * | 1995-01-27 | 1996-07-31 | NEC Corporation | Mobile satellite communication terminal |
| US5912641A (en) * | 1997-01-21 | 1999-06-15 | Globalstar L.P. | Indoor satellite cellular repeater system |
| US20090073918A1 (en) * | 2006-03-30 | 2009-03-19 | Finmeccanica S.P.A | System for extending bi-directional satellite radio communications in tunnels |
| CN102362445A (en) * | 2008-12-19 | 2012-02-22 | 电视广播有限公司 | System for satellite communications in tunnels |
-
2017
- 2017-07-21 CN CN201710600425.XA patent/CN107347190A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0724339A2 (en) * | 1995-01-27 | 1996-07-31 | NEC Corporation | Mobile satellite communication terminal |
| US5912641A (en) * | 1997-01-21 | 1999-06-15 | Globalstar L.P. | Indoor satellite cellular repeater system |
| US20090073918A1 (en) * | 2006-03-30 | 2009-03-19 | Finmeccanica S.P.A | System for extending bi-directional satellite radio communications in tunnels |
| CN102362445A (en) * | 2008-12-19 | 2012-02-22 | 电视广播有限公司 | System for satellite communications in tunnels |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109257083A (en) * | 2018-10-22 | 2019-01-22 | 中国电子科技集团公司第二十九研究所 | The compound relay transmission method of satellite-signal integration of high-speed rail tunnel area |
| CN110187368A (en) * | 2019-06-24 | 2019-08-30 | 中国电子科技集团公司第二十九研究所 | Doppler shift processing method between low orbit satellite and ground based terminal |
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Application publication date: 20171114 |
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| RJ01 | Rejection of invention patent application after publication |