CN202929373U - Beidou seamless high-precision time service system - Google Patents
Beidou seamless high-precision time service system Download PDFInfo
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- CN202929373U CN202929373U CN 201220497921 CN201220497921U CN202929373U CN 202929373 U CN202929373 U CN 202929373U CN 201220497921 CN201220497921 CN 201220497921 CN 201220497921 U CN201220497921 U CN 201220497921U CN 202929373 U CN202929373 U CN 202929373U
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- pseudo satellite
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Abstract
The utility model discloses a Beidou seamless high-precision time service implementation system. The system comprises Beidou satellites, a user receiving terminal, a pseudo satellite primary station and at least three pseudo satellite secondary stations, wherein the pseudo satellite primary station and the pseudo satellite secondary stations are fixedly arranged on different places of the space respectively; the pseudo satellite primary station receives signals sent by at least four Beidou satellites at the same time; the pseudo satellite secondary stations receive signals sent by the pseudo satellite primary station; the user receiving terminal receives the signals sent by the pseudo satellite primary station, the pseudo satellite secondary stations and the Beidou satellites at the same time. The system can use the pseudo satellites to achieve user time service individually, use the Beidou satellite navigation system to finish user time service invidually, and use the Beidou satellite navigation system and the pseudo satellite to achieve time service, and thus, the system has the characteristics of high precision and strong interference resistance.
Description
Technical field
The utility model relates to the satellite navigation time service field, is specifically related to a kind of based on the auxiliary seamless high precision time dissemination system of the Big Dipper of pseudo satellite, pseudolite.
Background technology
Satellite navigation is with its high precision, the links that round-the-clock, real-time, the zone advantage such as wide has been penetrated into each sphere of life and modern war, satellite navigation location and time dissemination system are one of national basis facilities of most critical, and, modern weapons real (examination) is tested, war needs its to ensure, the foundation of intelligent traffic transportation system and the realization of the digitizing earth need its support.Modern communication networks and power network construction have also more and more strengthened the dependence to precision time and frequency.
Beidou satellite system is satellite navigation location and the communication system of China's independent development, have first the location fast, without characteristics such as communication blind zone, strong securities, and all have unique advantage at aspects such as high precision time service, short message communications.Perfect along with Beidou satellite navigation system, the domsat that has a high potential navigation application industry will develop rapidly.
Although Beidou satellite navigation system has its unique advantage in time service, but, the direct time service of satellite navigation also has its drawback, be exactly that satellite-signal is more weak, the one, be easy to receive external interference and can not use, the 2nd, when environment for use is complicated, as around buildings, high mountain gorge are arranged, when indoor, satellite-signal is blocked, and can not use.
The utility model content
Technical problem to be solved in the utility model is to provide the seamless high precision time dissemination system of a kind of Big Dipper, and it can still can the high precision time service in complex environment.
For addressing the above problem, the utility model is achieved through the following technical solutions:
A kind of Big Dipper is seamless high precision time dissemination system, it mainly is comprised of big-dipper satellite, user's receiving terminal, pseudo satellite, pseudolite main website and 3 pseudo satellite, pseudolite secondary stations at least;
The pseudo satellite, pseudolite main website comprises Big Dipper time service receiving element, atomic clock, pseudo satellite, pseudolite main website transmitter unit, Big Dipper receiving antenna, pseudo satellite, pseudolite emitting antenna and master station communication emitting antenna; Big Dipper receiving antenna connects the input end of Big Dipper time service receiving element, the output terminal of Big Dipper time service receiving element is connected with the controlled end of atomic clock, the output terminal of atomic clock is connected on the clock control end of pseudo satellite, pseudolite main website transmitter unit, and the output terminal of pseudo satellite, pseudolite main website transmitter unit is connected with the master station communication emitting antenna with the pseudo satellite, pseudolite emitting antenna respectively;
The secondary station of each pseudo satellite, pseudolite includes pseudo satellite, pseudolite time service receiving element, local clock, the secondary transmitter unit of standing of pseudo satellite, pseudolite, pseudo satellite, pseudolite receiving antenna and secondary station communications transmit antenna; The pseudo satellite, pseudolite receiving antenna is connected on the input end of pseudo satellite, pseudolite time service receiving element, the output terminal of pseudo satellite, pseudolite time service receiving element is connected with the controlled end of local clock, the output terminal of local clock is connected on the clock control end of pseudo satellite, pseudolite secondary station transmitter unit, and the output terminal of pseudo satellite, pseudolite secondary station transmitter unit is connected with pair station communications transmit antenna;
Pseudo satellite, pseudolite main website and at least 3 secondary stations of pseudo satellite, pseudolite are fixedly mounted on respectively the diverse location place in space; The Big Dipper receiving antenna of pseudo satellite, pseudolite main website receives the signal that at least 4 big-dipper satellites are sent simultaneously; The pseudo satellite, pseudolite receiving antenna at the secondary station of pseudo satellite, pseudolite receives the signal that the pseudo satellite, pseudolite emitting antenna of pseudo satellite, pseudolite main website is sent; User's receiving terminal receives the signal that the pair station communications transmit antenna at the master station communication emitting antenna of pseudo satellite, pseudolite main website and at least 3 pseudo satellite, pseudolite secondary stations is sent simultaneously.
As improvement, described user's receiving terminal preferably also receives at least 4 signals that big-dipper satellite is sent.
in said system, the Big Dipper time service receiving element of pseudo satellite, pseudolite main website mainly is comprised of main website down conversion module, main website signal decoding module and main station time information extraction modules, Big Dipper receiving antenna connects the input end of main website down conversion module, the output terminal of main website down conversion module is connected with the input end of main station time information extraction modules via main website signal decoding module, and the output terminal of main station time information extraction modules connects the controlled end of atomic clock, the pseudo satellite, pseudolite main website transmitter unit of pseudo satellite, pseudolite main website is mainly by forming at master information coding module, main website spread spectrum and modulation module, main website carrier modulation module, main website D/A converter module, main website merit sub-module and 2 main website up-converter modules, the output terminal of master information coding module is successively via main website spread spectrum and modulation module, main website carrier modulation module and main website D/A converter module are connected with the input end of main website merit sub-module, 2 output terminals of main website merit sub-module respectively connect the input end of 1 main website up-converter module, the output terminal of a main website up-converter module connects the pseudo satellite, pseudolite emitting antenna, the output terminal of another main website up-converter module connects the master station communication emitting antenna, atomic clock connects respectively the master information coding module, main website spread spectrum and modulation module, main website carrier modulation module, the main website D/A converter module, main website merit sub-module and 2 main website up-converter modules.
In said system, the pseudo satellite, pseudolite time service receiving element at pseudo satellite, pseudolite secondary station mainly is comprised of pair station down conversion module, secondary station signal decoding module and secondary station temporal information extraction module; The input end of pseudo satellite, pseudolite receiving antenna auxiliary connection station down conversion module, the output terminal of secondary station down conversion module is connected via the input end of pair station signal decoding module with pair station temporal information extraction module, the controlled end of the output terminal connection local clock of secondary station temporal information extraction module; The pseudo satellite, pseudolite secondary station transmitter unit at the secondary station of pseudo satellite, pseudolite is mainly by forming with modulation module, secondary station carrier modulation module, secondary station D/A converter module and the secondary up-converter module of standing at pair station information coding module, secondary station spread spectrum; The output terminal of secondary station information coding module is connected via pair station spread spectrum and modulation module, secondary station carrier modulation module, the secondary station D/A converter module input end with pair station up-converter module successively, the output terminal auxiliary connection station communications transmit antenna of up-converter module, local clock be auxiliary connection station information coding module, secondary station spread spectrum and modulation module, secondary station carrier modulation module, secondary station D/A converter module and the secondary up-converter module of standing respectively.
Compared with prior art, the existing direct time service mode of the utility model is that user's receiving terminal directly receives Big Dipper satellite signal and realizes time service, changes into sending into user's receiving terminal after indirect time service mode namely forwards Big Dipper satellite signal by pseudo satellite, pseudolite main website and pseudo satellite, pseudolite secondary station again and realizing time service; At first, because the signal of pseudo satellite, pseudolite main website and pseudo satellite, pseudolite secondary station emission is relatively strong, therefore the interference that can effectively avoid external environment that faint satellite-signal is produced, improve the precision of time service, secondly, because the decorating position at pseudo satellite, pseudolite main website and pseudo satellite, pseudolite secondary station can be installed according to actual user demand, therefore can effectively avoid the interference that the around environment produces satellite-signal; Moreover, because not only can utilizing separately pseudo satellite, pseudolite, the utility model realizes user's time service, can also utilize separately the time service of Beidou satellite navigation system completing user, also can utilize Beidou satellite navigation system and pseudo satellite, pseudolite combination time service.Therefore, it is well wide outdoor that native system not only can be used for the big-dipper satellite observability, can also be used for big-dipper satellite be blocked situation or big-dipper satellite sightless indoor.
Description of drawings
Fig. 1 is the seamless high precision time dissemination system of a kind of Big Dipper principle schematic.
Fig. 2 is the theory diagram of pseudo satellite, pseudolite main website.
Fig. 3 is the theory diagram at the secondary station of pseudo satellite, pseudolite.
Fig. 4 is the theory diagram of user's receiving terminal.
Embodiment
A kind of Big Dipper is seamless high precision time dissemination system as shown in Figure 1, it mainly is comprised of big-dipper satellite, user's receiving terminal, pseudo satellite, pseudolite main website and 3 pseudo satellite, pseudolite secondary stations at least.
The pseudo satellite, pseudolite main website comprises Big Dipper time service receiving element, atomic clock, pseudo satellite, pseudolite main website transmitter unit, Big Dipper receiving antenna, pseudo satellite, pseudolite emitting antenna and master station communication emitting antenna as shown in Figure 2.Big Dipper receiving antenna connects the input end of Big Dipper time service receiving element, the output terminal of Big Dipper time service receiving element is connected with the controlled end of atomic clock, the output terminal of atomic clock is connected on the clock control end of pseudo satellite, pseudolite main website transmitter unit, and the output terminal of pseudo satellite, pseudolite main website transmitter unit is connected with the master station communication emitting antenna with the pseudo satellite, pseudolite emitting antenna respectively.The Big Dipper time service receiving element of pseudo satellite, pseudolite main website mainly is comprised of main website down conversion module, main website signal decoding module and main station time information extraction modules.Big Dipper receiving antenna connects the input end of main website down conversion module, the output terminal of main website down conversion module is connected with the input end of main station time information extraction modules via main website signal decoding module, and the output terminal of main station time information extraction modules connects the controlled end of atomic clock.The pseudo satellite, pseudolite main website transmitter unit of pseudo satellite, pseudolite main website is mainly by forming at master information coding module, main website spread spectrum and modulation module, main website carrier modulation module, main website D/A converter module, main website merit sub-module and 2 main website up-converter modules.the output terminal of master information coding module is successively via main website spread spectrum and modulation module, main website carrier modulation module and main website D/A converter module are connected with the input end of main website merit sub-module, 2 output terminals of main website merit sub-module respectively connect the input end of 1 main website up-converter module, the output terminal of a main website up-converter module connects the pseudo satellite, pseudolite emitting antenna, the output terminal of another main website up-converter module connects the master station communication emitting antenna, atomic clock connects respectively the master information coding module, main website spread spectrum and modulation module, main website carrier modulation module, the main website D/A converter module, main website merit sub-module and 2 main website up-converter modules.
The secondary station of each pseudo satellite, pseudolite includes pseudo satellite, pseudolite time service receiving element, local clock, the secondary transmitter unit of standing of pseudo satellite, pseudolite, pseudo satellite, pseudolite receiving antenna and secondary station communications transmit antenna as shown in Figure 3.The pseudo satellite, pseudolite receiving antenna is connected on the input end of pseudo satellite, pseudolite time service receiving element, the output terminal of pseudo satellite, pseudolite time service receiving element is connected with the controlled end of local clock, the output terminal of local clock is connected on the clock control end of pseudo satellite, pseudolite secondary station transmitter unit, and the output terminal of pseudo satellite, pseudolite secondary station transmitter unit is connected with pair station communications transmit antenna.The pseudo satellite, pseudolite time service receiving element at the secondary station of pseudo satellite, pseudolite mainly is comprised of pair station down conversion module, secondary station signal decoding module and secondary station temporal information extraction module.The input end of pseudo satellite, pseudolite receiving antenna auxiliary connection station down conversion module, the output terminal of secondary station down conversion module is connected via the input end of pair station signal decoding module with pair station temporal information extraction module, the controlled end of the output terminal connection local clock of secondary station temporal information extraction module.The pseudo satellite, pseudolite secondary station transmitter unit at the secondary station of pseudo satellite, pseudolite is mainly by forming with modulation module, secondary station carrier modulation module, secondary station D/A converter module and the secondary up-converter module of standing at pair station information coding module, secondary station spread spectrum.The output terminal of secondary station information coding module is connected via pair station spread spectrum and modulation module, secondary station carrier modulation module, the secondary station D/A converter module input end with pair station up-converter module successively, the output terminal auxiliary connection station communications transmit antenna of up-converter module, local clock be auxiliary connection station information coding module, secondary station spread spectrum and modulation module, secondary station carrier modulation module, secondary station D/A converter module and the secondary up-converter module of standing respectively.
The structure of user's receiving terminal is same as the prior art or close.In the utility model preferred embodiment, user's receiving terminal as shown in Figure 4, it mainly resolves module by terminal crystal oscillator and the terminal receiving antenna that is connected with the terminal crystal oscillator, terminal down conversion module, terminal analog to digital conversion, capture terminal module, tracking terminal module, end message decoder module and terminal time service and forms.The terminal receiving antenna is connected to the input end of terminal down conversion module, the output terminal of terminal down conversion module is connected via the input end that module is resolved in terminal analog to digital conversion, capture terminal module, tracking terminal module and end message decoder module and terminal time service successively, and the terminal time service is resolved module and is output as final user's time service information.
Pseudo satellite, pseudolite main website and at least 3 secondary stations of pseudo satellite, pseudolite are fixedly mounted on respectively the diverse location place in space.The Big Dipper receiving antenna of pseudo satellite, pseudolite main website receives the signal that at least 4 big-dipper satellites are sent simultaneously.The pseudo satellite, pseudolite receiving antenna at the secondary station of pseudo satellite, pseudolite receives the signal that the pseudo satellite, pseudolite emitting antenna of pseudo satellite, pseudolite main website is sent.User's receiving terminal receives the signal that the pair station communications transmit antenna at the master station communication emitting antenna of pseudo satellite, pseudolite main website and at least 3 pseudo satellite, pseudolite secondary stations is sent simultaneously.In order to realize utilizing the time service of Beidou satellite navigation system completing user, also in order to utilize Beidou satellite navigation system and pseudo satellite, pseudolite combination time service, described user's receiving terminal can also receive the signal that at least 4 big-dipper satellites are sent except the signal that send at pseudo satellite, pseudolite main website and at least 3 pseudo satellite, pseudolites secondary stations.
The seamless high precision time service of the Big Dipper implementation method that adopts said system to realize comprises the steps:
(1) 1 pseudo satellite, pseudolite main website of different position fixed installation and at least 3 pseudo satellite, pseudolite secondary stations in the space, and above-mentioned pseudo satellite, pseudolite main website and pseudo satellite, pseudolite secondary exact position of standing are all measured known in advance.
(2) at first the pseudo satellite, pseudolite main website receives the Big Dipper signal of at least 4 big-dipper satellites emissions, and obtains the time service result of the Big Dipper after down coversion, information decoding and temporal information are extracted.Then the pps pulse per second signal that utilizes gained time service result to send time service removes to tame the atomic clock of pseudo satellite, pseudolite main website, when making the time reference of pseudo satellite, pseudolite main website be traceable to the Big Dipper.At last under the driving of taming atomic clock, the position of pseudo satellite, pseudolite main website, station number and temporal information are carried out being divided into 2 road signals by the merit sub-module after information coding, signal spread-spectrum, signal modulation, carrier modulation and digital-to-analog conversion, and 2 up-converter modules are gone out this 2 road signal frequency conversion after different frequencies by 2 cover antenna transmissions.The 2 road signal one route pseudo satellite, pseudolite secondary station receptions of launching, another routing user receiving terminal receives.The pseudo satellite, pseudolite main website is furnished with high precision Big Dipper time service receiving equipment and atomic clock, and Big Dipper time service result so both can improve time service precision to local atomic clock calibrating frequency, but also can reduce the pre-heat-stable time of atomic clock.
(3) at first the secondary station of pseudo satellite, pseudolite receives the signal that the pseudo satellite, pseudolite main website sends, and carries out after down coversion, information decoding and temporal information extract, the distance between Computation of Pseudo satellite main website and secondary station, and obtain the secondary precise time of standing of pseudo satellite, pseudolite.Then utilize the precise time real time correction local clock at the pseudo satellite, pseudolite secondary station that obtains, make pseudo satellite, pseudolite secondary station not only synchronize with the pseudo satellite, pseudolite main website, and the secondary station of pseudo satellite, pseudolite and pseudo satellite, pseudolite main website are when all being traceable to the Big Dipper.Last under the driving of position, after position, station number and the temporal information at pseudo satellite, pseudolite secondary station are carried out information coding, signal spread-spectrum, signal modulation, carrier modulation and digital-to-analog conversion, go out through antenna transmission after upconverting to Big Dipper navigation signal frequency.
(4) user's receiving terminal receives pseudo satellite, pseudolite main website and at least 3 signals that send at pseudo satellite, pseudolite pair station, and with the signal that receives carry out down coversion, analog to digital conversion, catch, tracking, information decoding and time service resolve, and finally realizes user's high precision time service.In order to adapt to the time service of indoor and outdoors environment, above-mentioned user's receiving terminal can also receive the signal that at least 4 big-dipper satellites send simultaneously.At this moment, user's receiving terminal is by technology such as far-near effect removing method, multipath inhibition, despreading, demodulation, navigation and the time service of realization big-dipper satellite and Pseudolite signal in same receiving terminal, and based on the array mode of geometric dilution of precision principle of optimality research pseudo satellite, pseudolite and big-dipper satellite, realize that time service precision is better than Big Dipper time service precision.
For the ease of the processing of user's receiving terminal, the secondary coding mode information of standing of pseudo satellite, pseudolite main website and pseudo satellite, pseudolite all adopts the coding mode information of the Big Dipper.In like manner, the signal modulation system at the secondary station of pseudo satellite, pseudolite main website and pseudo satellite, pseudolite all adopts the signal modulation system of the Big Dipper.In order to distinguish the secondary station of pseudo satellite, pseudolite and user's receiving terminal, employing main website of pseudo satellite, pseudolite main website merit sub-module is divided into two-way to signal, goes out through different up-conversions and antenna transmission, and wherein, the frequency of one road signal is the frequency of the Big Dipper, as Big Dipper B1 frequency.The navigation signal of pseudo satellite, pseudolite and Big Dipper emission is all at same frequency, is only that the spreading code code of pseudo satellite, pseudolite is number different with the Big Dipper, and like this, user's receiving terminal just can adopt one to overlap two kinds of signals of antenna reception.Therefore, user's receiving terminal both can receive separately Big Dipper navigation signal, receive the pseudo satellite, pseudolite navigation signal separately, also can unite to receive these two kinds of signals.
Core improvement of the present utility model is to have set up the pseudo satellite, pseudolite main website and secondary station of pseudo satellite, pseudolite forwards satellite-signal.Wherein, the installation site at satellite main website and pseudo satellite, pseudolite secondary station is arranged on required place, locus according to the actual requirements, and guarantees that the installation site of pseudo satellite, pseudolite main website can receive the signal that at least 4 big-dipper satellites send simultaneously; The installation site at the secondary station of at least 3 pseudo satellite, pseudolites can receive the signal that same pseudo satellite, pseudolite main website sends simultaneously.User's receiving terminal is in the signal cover at pseudo satellite, pseudolite main website and 3 pseudo satellite, pseudolites secondary stations at least.The structure of the time service receiving element that the secondary station of satellite main website and pseudo satellite, pseudolite is inner and the time service calculation method of realizing are same as the prior art or close; The structure of the pseudo satellite, pseudolite transmitter unit that the secondary station of satellite main website and pseudo satellite, pseudolite is inner and the signal processing and the launching technique that realize are same as the prior art or close.
Claims (2)
1. the seamless high precision time dissemination system of the Big Dipper, comprise big-dipper satellite and user's receiving terminal, it is characterized in that: also further comprise pseudo satellite, pseudolite main website and at least 3 secondary stations of pseudo satellite, pseudolite;
The pseudo satellite, pseudolite main website comprises Big Dipper time service receiving element, atomic clock, pseudo satellite, pseudolite main website transmitter unit, Big Dipper receiving antenna, pseudo satellite, pseudolite emitting antenna and master station communication emitting antenna; Big Dipper receiving antenna connects the input end of Big Dipper time service receiving element, the output terminal of Big Dipper time service receiving element is connected with the controlled end of atomic clock, the output terminal of atomic clock is connected on the clock control end of pseudo satellite, pseudolite main website transmitter unit, and the output terminal of pseudo satellite, pseudolite main website transmitter unit is connected with the master station communication emitting antenna with the pseudo satellite, pseudolite emitting antenna respectively;
The secondary station of each pseudo satellite, pseudolite includes pseudo satellite, pseudolite time service receiving element, local clock, the secondary transmitter unit of standing of pseudo satellite, pseudolite, pseudo satellite, pseudolite receiving antenna and secondary station communications transmit antenna; The pseudo satellite, pseudolite receiving antenna is connected on the input end of pseudo satellite, pseudolite time service receiving element, the output terminal of pseudo satellite, pseudolite time service receiving element is connected with the controlled end of local clock, the output terminal of local clock is connected on the clock control end of pseudo satellite, pseudolite secondary station transmitter unit, and the output terminal of pseudo satellite, pseudolite secondary station transmitter unit is connected with pair station communications transmit antenna;
Pseudo satellite, pseudolite main website and at least 3 secondary stations of pseudo satellite, pseudolite are fixedly mounted on respectively the diverse location place in space; The Big Dipper receiving antenna of pseudo satellite, pseudolite main website connects simultaneously at least 4 big-dipper satellites and sends; The pseudo satellite, pseudolite receiving antenna at the secondary station of pseudo satellite, pseudolite connects the pseudo satellite, pseudolite emitting antenna of pseudo satellite, pseudolite main website; User's receiving terminal connects the pair station communications transmit antenna at the master station communication emitting antenna of pseudo satellite, pseudolite main website and at least 3 pseudo satellite, pseudolite secondary stations simultaneously.
2. the seamless high precision time dissemination system of the Big Dipper according to claim 1, it is characterized in that: described user's receiving terminal also connects the signal that at least 4 big-dipper satellites are sent.
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| CN 201220497921 CN202929373U (en) | 2012-09-26 | 2012-09-26 | Beidou seamless high-precision time service system |
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| CN 201220497921 CN202929373U (en) | 2012-09-26 | 2012-09-26 | Beidou seamless high-precision time service system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102866627A (en) * | 2012-09-26 | 2013-01-09 | 桂林电子科技大学 | Beidou seamless high-precision time service implementation method and system |
| CN104768217A (en) * | 2014-01-02 | 2015-07-08 | 中国移动通信集团公司 | Synchronization method, terminal and base station |
-
2012
- 2012-09-26 CN CN 201220497921 patent/CN202929373U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102866627A (en) * | 2012-09-26 | 2013-01-09 | 桂林电子科技大学 | Beidou seamless high-precision time service implementation method and system |
| CN102866627B (en) * | 2012-09-26 | 2014-05-07 | 桂林电子科技大学 | Beidou seamless high-precision time service implementation method and system |
| CN104768217A (en) * | 2014-01-02 | 2015-07-08 | 中国移动通信集团公司 | Synchronization method, terminal and base station |
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Granted publication date: 20130508 Effective date of abandoning: 20140507 |
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| RGAV | Abandon patent right to avoid regrant |