CN203287530U - Assistant Beidou satellite positioning system - Google Patents
Assistant Beidou satellite positioning system Download PDFInfo
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- CN203287530U CN203287530U CN2013200919074U CN201320091907U CN203287530U CN 203287530 U CN203287530 U CN 203287530U CN 2013200919074 U CN2013200919074 U CN 2013200919074U CN 201320091907 U CN201320091907 U CN 201320091907U CN 203287530 U CN203287530 U CN 203287530U
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Abstract
The utility model provides an assistant Beidou satellite positioning system comprising a Beidou satellite navigation system BDS satellite, a mobile communication network, an A-BDS position server and an A-BDS terminal receiver. The A-BDS terminal receiver comprises a control module, a power supply module, a mobile network communication function module and a Beidou receiver. The power supply module is respectively connected with the control module, the mobile network communication function module and the Beidou receiver and supplies power to the above components. The control module is respectively connected and controls the power supply module, the mobile network communication function module and the Beidou receiver. The A-BDS terminal receiver is communicated with the mobile communication network through the mobile network communication function module. The A-BDS terminal receiver receives the data from the Beidou satellite navigation system BDS satellite through the Beidou receiver. The A-BDS position server is provided with the mobile network communication function module and is communicated with the mobile communication network through the mobile network communication function module.
Description
Technical field
The technical program is a kind of based on auxiliary big-dipper satellite positioning system (A-BeiDou Navigation Satellite System, hereinafter referred A-BDS).The technical program merges the Big Dipper and mobile communications network, has promoted locating speed, has improved the indoor problem that can't know position, has solved the problem of data transmission.
Background technology
Beidou satellite navigation system (BDS) is the Chinese independent development capability of implementing, the GPS (Global Position System) of independent operating, formally provides service to the Asia-Pacific most areas in 27 days Dec in 2012, and plans to complete to the year two thousand twenty the structure of global system.Beidou satellite navigation system and american global positioning system, Russian glonass system and European Union's Galileo positioning system together, are the suppliers that the satellite navigation council of the United Nations has been assert.
The passive location that Beidou satellite navigation system provides, navigation, time service service, adopt the working mechanism similar to GPS: conventional terminal receiver needs the functions such as settling signal acquisition and tracking, demodulation, data solver, its shortcoming is that cold start-up is slow, primary positioning time (TTFF, time-to-first-fix) longer, indoorly can't obtain locating information, can only the passive receive satellite information.
Summary of the invention
The purpose of the technical program is to solve the above-mentioned problems in the prior art, introduces mobile communication system in dipper system, overcomes the deficiency of big-dipper satellite positioning system, proposes following technical scheme:
A kind of auxiliary big-dipper satellite positioning system, comprise Beidou satellite navigation system BDS satellite, mobile communications network, A-BDS location server and A-BDS terminal receiver;
Described A-BDS terminal receiver comprises control module, power module, mobile network communication functional module and Beidou receiver; Power module is link control module, mobile network communication functional module and Beidou receiver respectively, and is they power supplies; Described control module connects respectively and controls power module, mobile network communication functional module and Beidou receiver; The A-BDS terminal receiver is communicated by letter with mobile communications network by the mobile network communication functional module; The A-BDS terminal receiver receives data from Beidou satellite navigation system BDS satellite by Beidou receiver;
Described A-BDS location server is provided with the mobile network communication functional module, and the A-BDS location server is communicated by letter with mobile communications network by the mobile network communication functional module.
The front-end circuit of the Beidou receiver of described A-BDS terminal receiver comprises antenna, first order filtering circuit, first order amplifying circuit, second level filtering circuit and the second level amplifying circuit that connects according to this; The signal output part of described second level amplifying circuit connects the Big Dipper signal input part of Beidou receiver;
Described first and second grade filtering circuit is all SAW filter, and this SAW filter requires:
Band passband rate is 1559MHz～1577.42MHz;
Passband fluctuation is 0.5dB to the maximum, and minimum is 0.1dB, and insertion loss is 1.3dB to the maximum, is typically 0.9dB.
Absolute damping: DC～1526MHz is that 40dB, 1625～2500MHz are that 40dB, 2500～6000MHz are 30dB;
Input vswr (in band): be typically 1.1 and be 1.7 to the maximum;
Output VSWR (in band): typical case 1.1 is 1.7 to the maximum;
Impedance is 50ohm;
First and second grade amplifying circuit is the amplifier of gain for 20dB, noise figure＜1.
The location basic procedure of auxiliary big-dipper satellite positioning system is included as search of satellite and the large step of location compute two:
1, search of satellite:
1.1) the A-BDS terminal gets the subdistrict position at current place from mobile base station;
1.2) the A-BDS terminal sends cellular cell position, current place to the A-BDS location server by mobile radio communication;
1.3) the A-BDS location server according to the cellular cell position enquiring should zone available BDS satellite information, these information comprise frequency range, orientation and the elevation information of satellite, and by mobile communications network, return to the A-BDS terminal;
1.4) the A-BDS terminal is according to the available BDS satellite information that obtains, Rapid matching is to current available BDS satellite-signal;
2, location compute
The location compute of auxiliary big-dipper satellite positioning system comprises two schemes: the MS-Based mode of calculating in terminal and the MS-Assisted mode of calculating in network-side;
The MS-Based mode is by the demodulation of A-BDS terminal settling signal, location compute, obtains final position coordinates;
The MS-Assisted mode is to assist completing place to resolve task by the A-BDS location server, and basic procedure is as follows:
2.1) BDS pseudorange information exchange after the A-BDS terminal will be processed crosses mobile radio communication and send to the A-BDS location server;
2.2) the A-BDS location server is according to pseudorange information and in conjunction with architecture, with reference to the auxiliary positioning information that BDS location etc. obtains, and calculates final position coordinates, returns to the A-BDS terminal device.
A kind of terminal of location tracking based on said system, comprise control module, power module, mobile network communication functional module, Beidou receiver, display module and keyboard;
Described power module link control module, mobile network communication functional module, Beidou receiver and display module, be they power supplies;
Described control module receives the data to Beidou receiver, controls simultaneously the work of Beidou receiver;
Described control module is controlled the work of mobile network communication functional module;
Described control module is controlled the work of display module;
Described control module is controlled the work of power module;
The control signal input end of the signal output part link control module of described keyboard;
The location job step of this location tracking terminal comprises:
One) start and initialization;
Two) control the mobile network communication functional module by control module and enter park mode, close Beidou receiver and display module, control module self enters the holding state of low-power consumption simultaneously;
If condition:
A) key of keyboard is pressed, and by control module, controls display module work, and the computing that wakes control module self every the set time up, and after refreshing screen simultaneously, control module enters holding state again; Then enter step 3);
Perhaps: b) by the mobile network communication functional module, received the order note of number binding, control module is waken up, the line number of going forward side by side code bindings; Then enter step 3);
Perhaps: c) by the mobile network communication functional module, receive the positioning command note, control module is waken up, and open Beidou receiver, and analyze to the position of this location tracking terminal of Beidou receiver, the message information of time, attempt obtaining position, the temporal information of this location tracking terminal;
, if the Big Dipper is located successfully, by the mobile network communication functional module, send the positional information of this location tracking terminal to the binding number; Then enter step 3)
If Big Dipper location is unsuccessful, by the base station of mobile network communication functional module by mobile communications network, positioned, obtain the positional information of this location tracking terminal and send to the binding number; Then enter step 3);
Three) control the mobile network communication functional module by control module and enter park mode, close Beidou receiver and display module, control module self enters the holding state of low-power consumption simultaneously.
The front-end circuit of described Beidou receiver comprises antenna, first order filtering circuit, first order amplifying circuit, second level filtering circuit and the second level amplifying circuit that connects according to this; The signal output part of described second level amplifying circuit connects the Big Dipper signal input part of Beidou receiver;
Described first and second grade filtering circuit is all SAW filter, and this SAW filter requires:
Band passband rate is 1559MHz～1577.42MHz;
Passband fluctuation is 0.5dB to the maximum, and minimum is 0.1dB, and insertion loss is 1.3dB to the maximum, is typically 0.9dB.
Absolute damping: DC～1526MHz is that 40dB, 1625～2500MHz are that 40dB, 2500～6000MHz are 30dB;
Input vswr (in band): be typically 1.1 and be 1.7 to the maximum;
Output VSWR (in band): typical case 1.1 is 1.7 to the maximum;
Impedance is 50ohm;
First and second grade amplifying circuit is the amplifier of gain for 20dB, noise figure＜1.
Described condition c) in, this location tracking terminal comprises by the step that Beidou receiver and mobile network communication functional module position:
1) at first with the mobile network base station address at place own, namely the Position Approximate of location tracking terminal arrives the A-BDS location server by Internet Transmission to this location tracking terminal;
2) the BDS supplementary (these supplementarys comprise ephemeris and the azimuth pitch angle of BDS) that the A-BDS location server is relevant to this position of A-BDS location server itself storage according to the Position Approximate transmission of this location tracking terminal sends to the location tracking terminal;
3) this location tracking terminal receives the BDS original signal according to the BDS supplementary; (with promote the BDS signal first locking time the TTFF ability)
4) this location tracking terminal restituted signal after receiving the BDS original signal, calculate the pseudorange (pseudorange be the distance that be subjected to various BDS error effects) of this location tracking terminal to satellite, and relevant information be transferred to the A-BDS location server by the mobile network;
5) the A-BDS location server is completed processing to BDS information according to the above-mentioned BDS pseudorange information that transmits with from the supplementary of other positioning equipments (as difference BDS base station etc.), and estimates the position of this location tracking terminal;
6) the A-BDS location server arrives location gateway or application platform with the position of this location tracking terminal by Internet Transmission.
Described condition c) in, location compute, in network-side, is completed by the A-BDS location server, perhaps at this location tracking terminal end,, from the information of mobile network communication functional module or Beidou receiver, calculating, obtain the positional information of this location tracking terminal by control module;
1, location compute is that the main information that transmits in the auxiliary A-BDS system of user terminal comprises in network-side:
(1) information of delivering to the A-BDS server from user side comprises:
Location Request;
The position that the user is general;
Time-based pseudo range data;
(2) information of delivering to user side from the A-BDS location server comprises:
Visible satellite list;
The Doppler frequency deviation of the satellite of seeing and code phases or approximate terminal device position and ephemeris;
The BDS reference time;
2, location compute is in terminal device is A-BDS scheme based on user terminal, and the main information of transmission comprises:
(1) information of delivering to the A-BDS server from the location tracking terminal comprises:
Location Request;
The position that the location tracking terminal is general;
The positional information that calculates;
(2) information of delivering to user side from the A-BDS server comprises:
Visible satellite list;
The Doppler frequency deviation of the satellite of seeing and code phases;
Accurate satellite orbit data is ephemeris, effectively, also can expand to namely 12 hours visible whole cycle of satellite in 2-4 hour;
The DBDS correction data;
The BDS reference time;
The real-time integrality of satellite comprises fault or malfunctioning satellite information.
The version of this location tracking terminal can be very flexible, such as adopting Wrist belt-type structure, Necklet-type structure etc.
The technical program is together used the Big Dipper and mobile network, not only solved the problem of data transmit-receive, several deficiencies of big-dipper satellite positioning system have been solved simultaneously: conventional BDS terminal receiver, must gamut search for the BDS satellite-signal, complete and catch, tracking, demodulation, the function such as resolve, operand is larger, causes that cold start-up is slow, primary positioning time is longer.And indoor, can't obtain positional information.
Pass through auxiliary big-dipper satellite positioning system (Assisted BeiDou Navigation Satellite System in the technical program, hereinafter referred A-BDS) accelerate primary positioning time (TTFF, time-to-first-fix), architecture system enhancement by the mobile network Big Dipper can't indoor positioning problem, the locating information of the other degree of accuracy of hundred meter levels can be provided under indoor conditions.
Description of drawings
Fig. 1 is the theory diagram of auxiliary big-dipper satellite positioning system;
Fig. 2 is based on the theory diagram of the location tracking terminal of auxiliary big-dipper satellite positioning system;
Fig. 3 is the front-end circuit schematic diagram of Beidou receiver;
Fig. 4 is based on the principle of work schematic diagram of the location tracking terminal of auxiliary big-dipper satellite positioning system.
Embodiment
The purpose of the technical program is achieved through the following technical solutions:
As Fig. 1, a kind of auxiliary big-dipper satellite positioning system (being called for short A-BDS), comprise BDS satellite, mobile communications network, A-BDS location server and A-BDS terminal receiver; Described A-BDS terminal receiver comprises control module, power module, mobile network communication functional module and Beidou receiver; Power module is link control module, mobile network communication functional module and Beidou receiver respectively, and is they power supplies; Described control module connects respectively and controls power module, mobile network communication functional module and Beidou receiver; The A-BDS terminal receiver is communicated by letter with mobile communications network by the mobile network communication functional module; The A-BDS terminal receiver receives data from the BDS satellite by Beidou receiver; Described A-BDS location server is provided with the mobile network communication functional module, and the A-BDS location server is communicated by letter with mobile communications network by the mobile network communication functional module.
A-BDS location basic procedure can be divided into search of satellite, the large step of location compute two:
1, search of satellite
At first to search for the visual BDS satellite of current region after the A-BDS starting up of terminal.Conventional BDS receiver need to carry out FR satellite acquisition, cause the cold start-up time longer.Described A-BDS inquires about the A-BDS location server, directly obtains the usable satellite information of region by mobile communications network, thereby has improved the star speed of searching.
For example, the basic procedure of A-BDS search of satellite is as follows:
1) the A-BDS terminal gets the subdistrict position at current place from mobile base station;
2) the A-BDS terminal sends current cellular cell position to the A-BDS location server by mobile radio communication;
3) the A-BDS location server according to the cellular cell position enquiring should zone available BDS satellite information (relevant information such as frequency range, orientation, the elevation angle that comprises satellite), and by mobile communications network, return to the A-BDS terminal;
4) the A-BDS terminal is according to the usable satellite information that obtains, and Rapid matching is to current available BDS satellite-signal.
By said process, can avoid terminal receiver gamut search of satellite signals aimlessly, A-BDS improves major embodiment in this course to locating speed.
2, location compute
After completing and searching the star process, just can carry out location compute, obtain locating information.The location compute of A-BDS can have two schemes: the MS-Based mode of calculating in terminal and the MS-Assisted mode of calculating in network-side.
It is identical that MS-Based mode and conventional BDS terminal are resolved mode,, by the demodulation of terminal settling signal, location compute, obtains final position coordinates;
The MS-Assisted mode is to assist completing place to resolve task by the A-BDS location server, and basic procedure is as follows:
1) the BDS pseudorange information exchange after the A-BDS terminal will be processed is crossed mobile radio communication and is sent to the A-BDS location server;
2) the A-BDS location server, according to pseudorange information and in conjunction with architecture, with reference to the auxiliary positioning information that BDS location etc. obtains, calculates final position coordinates, returns to equipment.
When using the MS-Assisted mode,, due to adding of auxiliary positioning information, can obtain higher positioning precision; Complicated calculations is transferred to network-side, can reduce computation burden, the minimizing electric quantity consumption of terminal device.
As shown in Figure 2, the location tracking terminal is comprised of several parts such as Beidou receiver, mobile network communication functional circuit, control algorithm circuit, power circuits.The described Big Dipper and mobile network's localization tracker can be divided into and obtain positional information, positional information sends two large steps:
1, obtain positional information
The control algorithm circuit is learnt while needing to obtain positional information, at first opens the Beidou receiver circuit, starts to search for the big-dipper satellite of current region.During this time, the control algorithm circuit will make mobile communication function circuit and Beidou receiver collaborative work accelerate locating speed according to the A-BDS system principle.If still can't obtain positional information in 1 minute, it is indoor that arithmetic control circuit thinks that may be in this moment, closes Beidou receiver, then by the mobile network, use architecture to obtain coarse position information.
(1) the A-BDS terminal gets the subdistrict position at current place from mobile base station;
(2) the A-BDS terminal sends current cellular cell position to the A-BDS location server by mobile radio communication;
(3) the A-BDS location server according to the cellular cell position enquiring should zone available BDS satellite information (relevant information such as frequency range, orientation, the elevation angle that comprises satellite), and by mobile communications network, return to the A-BDS terminal;
(4) the A-BDS terminal is according to the usable satellite information that obtains, and Rapid matching is to current available BDS satellite-signal.
(5) if still can't obtain accurate location information by BDS in 1 minute, tracker will cut out Beidou receiver, bring into use architecture, and basic station number and respective signal intensity are sent to server, and server carries out home position information after complicated calculations.
2, positional information sends
After the acquisition of information of completing place, the control algorithm circuit will be controlled the mobile communication function circuit, by data network (GPRS, EDGE, HSDPA or EV-DO, the 4G network that will occur from now on even etc.) or the form of note, locating information will be sent to server or individual.Real-time to server by data network delivering position data, expense is cheap; Positional information directly can be sent to specific recipient by note, need not to pass through transit server.
, specific to this location tracking terminal, comprise control module, power module, mobile network communication functional module, Beidou receiver, display module and keyboard; Described power module link control module, mobile network communication functional module, Beidou receiver and display module, be they power supplies; Described control module receives the data to Beidou receiver, controls simultaneously the work of Beidou receiver; Described control module is controlled the work of mobile network communication functional module; Described control module is controlled the work of display module; Described control module is controlled the work of power module; The control signal input end of the signal output part link control module of described keyboard;
The location job step of this location tracking terminal comprises:
One) start and initialization;
Two) control the mobile network communication functional module by control module and enter park mode, close Beidou receiver and display module, control module self enters the holding state of low-power consumption simultaneously;
If condition:
A) key of keyboard is pressed, and by control module, controls display module work, and the computing that wakes control module self every the set time up, and after refreshing screen simultaneously, control module enters holding state again; Then enter step 3);
Perhaps: b) by the mobile network communication functional module, received the order note of number binding, control module is waken up, the line number of going forward side by side code bindings; Then enter step 3);
Perhaps: c) by the mobile network communication functional module, receive the positioning command note, control module is waken up, and open Beidou receiver, and analyze to the position of this location tracking terminal of Beidou receiver, the message information of time, attempt obtaining position, the temporal information of this location tracking terminal;
, if the Big Dipper is located successfully, by the mobile network communication functional module, send the positional information of this location tracking terminal to the binding number; Then enter step 3)
If Big Dipper location is unsuccessful, by the base station of mobile network communication functional module by mobile communications network, positioned, obtain the positional information of this location tracking terminal and send to the binding number; Then enter step 3);
Three) control the mobile network communication functional module by control module and enter park mode, close Beidou receiver and display module, control module self enters the holding state of low-power consumption simultaneously.
Described condition c) in, this location tracking terminal comprises by the step that Beidou receiver and mobile network communication functional module position:
1) at first with the mobile network base station address at place own, namely the Position Approximate of location tracking terminal arrives the A-BDS location server by Internet Transmission to this location tracking terminal;
2) the BDS supplementary (these supplementarys comprise ephemeris and the azimuth pitch angle of BDS) that the A-BDS location server is relevant to this position of A-BDS location server itself storage according to the Position Approximate transmission of this location tracking terminal sends to the location tracking terminal;
3) this location tracking terminal receives the BDS original signal according to the BDS supplementary; (with promote the BDS signal first locking time the TTFF ability)
4) this location tracking terminal restituted signal after receiving the BDS original signal, calculate the pseudorange (pseudorange be the distance that be subjected to various BDS error effects) of this location tracking terminal to satellite, and relevant information be transferred to the A-BDS location server by the mobile network;
5) the A-BDS location server is completed processing to BDS information according to the above-mentioned BDS pseudorange information that transmits with from the supplementary of other positioning equipments (as difference BDS base station etc.), and estimates the position of this location tracking terminal;
6) the A-BDS location server arrives location gateway or application platform with the position of this location tracking terminal by Internet Transmission.
Described condition c) in, location compute, in network-side, is completed by the A-BDS location server, perhaps at this location tracking terminal end,, from the information of mobile network communication functional module or Beidou receiver, calculating, obtain the positional information of this location tracking terminal by control module.
Two kinds of patterns of subscriber terminal equipment are all supported.
1, the main information that transmits in the A-BDS system that user terminal is assisted:
(1) information of delivering to the A-BDS server from user side comprises:
Location Request;
The position that the user is general;
Time-based pseudo range data;
(2) information of delivering to user side from the A-BDS server comprises:
Visible satellite list;
The Doppler frequency deviation of the satellite of seeing and code phases or approximate terminal device position and ephemeris;
The BDS reference time;
Need short download time in the A-BDS scheme that user terminal is assisted, utilize communication network Resource Calculation customer location, accelerated like this location compute process, user side is without the need for extra computing function.Shortcoming is that supplementary is short effective time, and uploading data is more.
2, the main information that transmits in the A-BDS system based on user terminal:
(1) information of delivering to the A-BDS server from user side comprises:
Location Request
The position that the user is general
The positional information that calculates
(2) information of delivering to user side from the A-BDS server comprises:
Visible satellite list
The Doppler frequency deviation of the satellite of seeing and code phases
Accurate satellite orbit data (ephemeris), effectively, also can expand to the visible whole cycle of satellite (12 hours) in 2-4 hour
The DBDS correction data
The BDS reference time;
The real-time integrality of satellite (fault or malfunctioning satellite information)
In A-BDS scheme based on user terminal, location compute is at terminal device, and this just requires will increase relational storage RAM and ROM in equipment, and needs certain computing power (a few MIPS).Be to need long-time downloaded assistance data in addition, slowed down computation process.User terminal can, as a BDS receiver independently, can be used for other BDS function.The data of user terminal uploads are relatively few, and most of auxiliary data reaches 2-4 hour effective time.Improve the problem that can't locate in the BDS system chambers by architecture.Send locating information by mobile communications network.
With reference to figure 3, big-dipper satellite positioning system and mobile communications network are used simultaneously, run into the problem that the mobile network disturbs Big Dipper signal to receive, solve by improving Big Dipper receiving unit circuit, the use two stage filter amplifies: signal by antenna reception after through once amplifying after SAW filter, again again amplify after SAW filter filtering afterwards.Can solve the interference of the signals such as mobile network after using this circuit.
Specifically, the front-end circuit of described Beidou receiver comprises antenna, first order filtering circuit, first order amplifying circuit, second level filtering circuit and the second level amplifying circuit that connects according to this; The signal output part of described second level amplifying circuit connects the Big Dipper signal input part of Beidou receiver;
Described first and second grade filtering circuit is all SAW filter, and this SAW filter requires:
Band passband rate is 1559MHz～1577.42MHz;
Passband fluctuation is 0.5dB to the maximum, and minimum is 0.1dB, and insertion loss is 1.3dB to the maximum, is typically 0.9dB.
Absolute damping: DC～1526MHz is that 40dB, 1625～2500MHz are that 40dB, 2500～6000MHz are 30dB;
Input vswr (in band): be typically 1.1 and be 1.7 to the maximum;
Output VSWR (in band): typical case 1.1 is 1.7 to the maximum;
Impedance is 50ohm;
First and second grade amplifying circuit is the amplifier of gain for 20dB, noise figure＜1.
Simultaneously, at Beidou receiver, adopt the Big Dipper 2 generation corresponding receiver,, by the selection of front-end circuit, can make this A-BDS terminal receiver, as compatible Beidou satellite system and gps systems such as location tracking terminals.
With reference to figure 4, in figure, the dotted line frame is partly in order to allow the location tracking terminal system obtain minimum power consumption under holding state.Add the bold box part when showing, CPU only wakes up when requiring calculation or control, and complete operation is placed on sleep pattern and reduces power consumption.
This routine described A-BDS(assists the big-dipper satellite positioning system) formed by BDS satellite, mobile communications network, A-BDS location server, A-BDS terminal receiver.The A-BDS terminal receiver when receiving the BDS satellite-signal, can also be undertaken alternately by mobile communications network and A-BDS location server, obtains auxiliary positioning information, accelerates locating speed.And conventional BDS terminal receiver, must gamut search BDS satellite-signal, to complete and catch, tracking, demodulation, the function such as resolve, operand is larger, causes that cold start-up is slow, primary positioning time is longer.In this aided positioning system, terminal receiver can be accessed the A-BDS location server by mobile communications network, obtain the usable satellite information (comprising satellite band, orientation, the elevation angle etc.) of current region, thereby avoided the gamut search, therefore original cold start-up time can be reduced to several seconds by a few minutes, thereby greatly accelerate locating speed.
The auxiliary big-dipper satellite positioning system (A-BDS that the technical program proposes, Assisted BeiDou Navigation Satellite System) and based on the location tracking terminal that tracking function is arranged of this system, introduce the booster action of mobile communication system in the BDS system, significantly accelerate BDS system locating speed, improved the indoor problem that can't know position, solve the problem of data transmission, thereby filled up domestic and international blank in this technical field.
Claims (2)
1. an auxiliary big-dipper satellite positioning system, is characterized in that comprising Beidou satellite navigation system BDS satellite, mobile communications network, A-BDS location server and A-BDS terminal receiver;
Described A-BDS terminal receiver comprises control module, power module, mobile network communication functional module and Beidou receiver; Power module is link control module, mobile network communication functional module and Beidou receiver respectively, and is they power supplies; Described control module connects respectively and controls power module, mobile network communication functional module and Beidou receiver; The A-BDS terminal receiver is communicated by letter with mobile communications network by the mobile network communication functional module; The A-BDS terminal receiver receives data from Beidou satellite navigation system BDS satellite by Beidou receiver;
Described A-BDS location server is provided with the mobile network communication functional module, and the A-BDS location server is communicated by letter with mobile communications network by the mobile network communication functional module.
2. auxiliary big-dipper satellite positioning system according to claim 1, is characterized in that the front-end circuit of the Beidou receiver of described A-BDS terminal receiver comprises antenna, first order filtering circuit, first order amplifying circuit, second level filtering circuit and the second level amplifying circuit that connects according to this; The signal output part of described second level amplifying circuit connects the Big Dipper signal input part of Beidou receiver;
Described first and second grade filtering circuit is all SAW filter, and this SAW filter requires:
Band passband rate is 1559MHz～1577.42MHz;
Passband fluctuation is 0.5dB to the maximum, and minimum is 0.1dB, and insertion loss is 1.3dB to the maximum, is typically 0.9dB;
Absolute damping: DC～1526MHz is that 40dB, 1625～2500MHz are that 40dB, 2500～6000MHz are 30dB;
Input vswr in band: be typically 1.1, be 1.7 to the maximum;
Output VSWR in band: typical case 1.1 is 1.7 to the maximum;
Impedance is 50ohm;
First and second grade amplifying circuit is the amplifier of gain for 20dB, noise figure＜1.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698792A (en) * | 2013-11-29 | 2014-04-02 | 宇龙计算机通信科技(深圳)有限公司 | Network server, terminal, positioning system and positioning method |
| CN104391309A (en) * | 2014-11-18 | 2015-03-04 | 无锡悟莘科技有限公司 | Beidou positioning system adopting helical antenna design |
| CN107861136A (en) * | 2017-12-08 | 2018-03-30 | 西安中星伟业通讯科技有限公司 | Communication system and communication means based on big-dipper satellite and internet, portable Big Dipper terminal |
| CN108847951A (en) * | 2018-04-18 | 2018-11-20 | 广州市中海达测绘仪器有限公司 | Base station long-distance monitoring method and system, base station subsystem |
-
2013
- 2013-02-28 CN CN2013200919074U patent/CN203287530U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698792A (en) * | 2013-11-29 | 2014-04-02 | 宇龙计算机通信科技(深圳)有限公司 | Network server, terminal, positioning system and positioning method |
| CN104391309A (en) * | 2014-11-18 | 2015-03-04 | 无锡悟莘科技有限公司 | Beidou positioning system adopting helical antenna design |
| CN107861136A (en) * | 2017-12-08 | 2018-03-30 | 西安中星伟业通讯科技有限公司 | Communication system and communication means based on big-dipper satellite and internet, portable Big Dipper terminal |
| CN108847951A (en) * | 2018-04-18 | 2018-11-20 | 广州市中海达测绘仪器有限公司 | Base station long-distance monitoring method and system, base station subsystem |
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