CN102411147B - Unidirectional time-service discipline system and method for Beidou-I satellite system - Google Patents
Unidirectional time-service discipline system and method for Beidou-I satellite system Download PDFInfo
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- CN102411147B CN102411147B CN 201110435308 CN201110435308A CN102411147B CN 102411147 B CN102411147 B CN 102411147B CN 201110435308 CN201110435308 CN 201110435308 CN 201110435308 A CN201110435308 A CN 201110435308A CN 102411147 B CN102411147 B CN 102411147B
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Abstract
The invention discloses a unidirectional time-service discipline system and method for a Beidou-I satellite system. The method comprises the following three steps: crystal oscillation offset detection based on a DSP (Digital Signal Processor): at the time of each frame, the DSP automatically detects the offset of the actual crystal oscillation value relative to a theoretical value, stores the offset in a register, and transfers the offset to a crystal oscillation correction module of an FPGA (Field Programmable Gate Array) when the time of next frame comes; crystal oscillation correction: the FPGA monitors the satellite status in real time, the crystal oscillation correction module is switched into a time-service mode when satellite is unlocked or malfunctioning, and then a stable signal based on one pulse per second (1PPS) is generated within a short time by virtue of internal time-service counters A and B of a time-service module; and time service: the time of each frame of the internal time-service counters A and B is synchronized with that of time-service time counters A and B at one time. The unidirectional time-service discipline system and method have the beneficial effects of solving the problems of low time-service precision, poor stability and the like resulting from faults of satellite beams of the Beidou-I satellite system within a short time, and improving the time-service precision and the stability.
Description
Technical field
The present invention relates to the taming system and method for a kind of BeiDou-I satellite system's one-way timing.
Background technology
" No. one, the Big Dipper " satellite navigation system is a kind of region satellite navigation location of communication system that China develops voluntarily and sets up, claim again " Double-Star Positioning System " system or " No. one, the Big Dipper " system, this system adopts geosynchronous satellite to carry out navigator fix, has very strong time service energy, the time service service range comprises China territory and south east asia, the 3rd satellite of " No. one, the Big Dipper " system succeeded in sending up lift-off along with on May 25th, 2003, " No. one, the Big Dipper " system begins provide stable and locate reliably for various users comprehensively, communication and time service are used, satellite time transfer is due to broad covered area, precision is high, the advantages such as cost is relatively low are widely used, yet satellite distance ground kilometers up to ten thousand, the signal transmission easily is disturbed, and satellite time transfer commonly used mostly is two-way timing at present, the resolving time of location and time service is longer, time service precision is relatively poor, at present, time service commonly used is tamed system without satellite-signal or satellite-signal fault the time, can not keep at short notice the precision and stability of time service, restricted application, user's experience property is relatively poor.
Summary of the invention
Purpose of the present invention namely is to overcome the deficiencies in the prior art, provide a kind of BeiDou-I satellite system's one-way timing taming system and method, the problems such as time service precision that the BeiDou-I satellite system causes because of the satellite beams fault at short notice and stability is good have been solved, guarantee without satellite-signal or satellite-signal fault the time, also can keep at short notice the precision and stability of time service, have and improve time service precision and stability, the advantage such as applied widely.
purpose of the present invention is achieved through the following technical solutions: BeiDou-I satellite system one-way timing is tamed system, it comprises punctual module and the crystal oscillator correcting module of being located in FPGA, and be located at crystal oscillator offset detection module in DSP, crystal oscillator offset detection module is connected with the crystal oscillator correcting module, the crystal oscillator correcting module is connected with punctual module, punctual module comprises inner punctual counter A and inner punctual counter B, the carry output of inner punctual counter A is connected with the counting input of inner punctual counter B, the keep time counting set of counter B of inner punctual counter A and be connected is connected respectively counting and is exported and be connected with time service time counter B with time service time counter A, time service time counter B is connected with punctual module, inner punctual counter B is connected with the crystal oscillator correcting module.
BeiDou-I satellite system one-way timing is tamed method, and it comprises DSP crystal oscillator offset detection, crystal oscillator correction, punctual three steps;
DSP crystal oscillator offset detection: the hardware interrupts one of design arrives, be each frame zero-time, DSP detects crystal oscillator actual value automatically with respect to the side-play amount of theoretical value, and side-play amount is stored in register, when the next frame time arrives, side-play amount is inserted in the crystal oscillator correcting module of FPGA;
Crystal oscillator correction: the out-of-lock condition of FPGA Real-Time Monitoring satellite, when satellite losing lock or fault, start synchronous punctual module and crystal oscillator correcting module, the crystal oscillator correcting module is cut into punctual pattern, in conjunction with the punctual counter A in the inside of punctual module and inner punctual counter B, produce stable 1PPS pulse signal in the short time;
punctual: inner punctual counter A and inner punctual each frame time of counter B are synchronized with time service time counter A and time service time counter B once, the punctual counter A in described inside is the count value that the clock signal by radio frequency part obtains by the FPGA frequency division, a clock period produces a count value, when count value reaches a time in frame period, the punctual counter B carry to inside, simultaneously, each frame time, the count value of time service time counter A and time service time counter B is all inserted inner punctual counter A and inner punctual counter B, count value and time service time synchronized, namely under normal circumstances, each frame time, inner punctual counter A and inner punctual counter B are reset.
The invention has the beneficial effects as follows: the invention provides the taming system and method for BeiDou-I satellite system's one-way timing, the problems such as time service precision that the BeiDou-I satellite system causes because of the satellite beams fault at short notice and stability is good have been solved, guarantee without satellite-signal or satellite-signal fault the time, also can keep at short notice the precision and stability of time service, have and improve time service precision and stability, the advantage such as applied widely.
Description of drawings
Fig. 1 is structured flowchart of the present invention;
Fig. 2 is the structured flowchart of the inner punctual counter of the present invention and time service time counter.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing, but protection scope of the present invention is not limited to the following stated.
as Fig. 1, shown in Figure 2, BeiDou-I satellite system one-way timing is tamed system, it comprises punctual module and the crystal oscillator correcting module of being located in FPGA, and be located at crystal oscillator offset detection module in DSP, crystal oscillator offset detection module is connected with the crystal oscillator correcting module, the crystal oscillator correcting module is connected with punctual module, punctual module comprises inner punctual counter A and inner punctual counter B, the carry output of inner punctual counter A is connected with the counting input of inner punctual counter B, the keep time counting set of counter B of inner punctual counter A and be connected is connected respectively counting and is exported and be connected with time service time counter B with time service time counter A, time service time counter B is connected with punctual module, inner punctual counter B is connected with the crystal oscillator correcting module.
BeiDou-I satellite system one-way timing is tamed method, and it comprises DSP crystal oscillator offset detection, crystal oscillator correction, punctual three steps;
DSP crystal oscillator offset detection: the hardware interrupts one of design arrives, be each frame zero-time, DSP detects crystal oscillator actual value automatically with respect to the side-play amount of theoretical value, and side-play amount is stored in register, when the next frame time arrives, side-play amount is inserted in the crystal oscillator correcting module of FPGA;
Crystal oscillator correction: the out-of-lock condition of FPGA Real-Time Monitoring satellite, when satellite losing lock or fault, start synchronous punctual module and crystal oscillator correcting module, the crystal oscillator correcting module is cut into punctual pattern, in conjunction with the punctual counter A in the inside of punctual module and inner punctual counter B, produce stable 1PPS pulse signal in the short time;
punctual: inner punctual counter A and inner punctual each frame time of counter B are synchronized with time service time counter A and time service time counter B once, the punctual counter A in described inside is the count value that the clock signal by radio frequency part obtains by the FPGA frequency division, a clock period produces a count value, when count value reaches a time in frame period, the punctual counter B carry to inside, simultaneously, each frame time, the count value of time service time counter A and time service time counter B is all inserted inner punctual counter A and inner punctual counter B, count value and time service time synchronized, namely under normal circumstances, each frame time, inner punctual counter A and inner punctual counter B are reset.
Claims (1)
1. BeiDou-I satellite system one-way timing is tamed method, it is characterized in that: it comprises DSP crystal oscillator offset detection, crystal oscillator correction, punctual three steps:
DSP crystal oscillator offset detection: each frame zero-time, DSP detects crystal oscillator actual value automatically with respect to the side-play amount of theoretical value, and side-play amount is stored in register, when the next frame time arrives, side-play amount is inserted in the crystal oscillator correcting module of FPGA;
Crystal oscillator correction: FPGA Real-Time Monitoring satellitosis, when satellite losing lock or fault, start synchronous punctual module and crystal oscillator correcting module, the crystal oscillator correcting module is cut into punctual pattern, in conjunction with the punctual counter A in the inside of punctual module and inner punctual counter B, produce stable 1PPS pulse signal in the short time;
Punctual: inner punctual counter A is the count value that the clock signal by radio frequency part obtains by the FPGA frequency division, a clock period produces a count value, when count value reaches a time in frame period, the punctual counter B carry to inside, simultaneously, each frame time, the count value of time service time counter A and time service time counter B is all inserted inner punctual counter A and inner punctual counter B, count value and time service time synchronized, namely under normal circumstances, inner punctual counter A of the time of each frame and inner punctual counter B are reset.
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| CN 201110435308 CN102411147B (en) | 2011-12-22 | 2011-12-22 | Unidirectional time-service discipline system and method for Beidou-I satellite system |
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| CN 201110435308 CN102411147B (en) | 2011-12-22 | 2011-12-22 | Unidirectional time-service discipline system and method for Beidou-I satellite system |
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| CN102411147B true CN102411147B (en) | 2013-06-19 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103399808B (en) * | 2013-06-06 | 2016-05-04 | 北京航天自动控制研究所 | A kind of method that realizes the two redundancies of crystal oscillator in flight control computer |
| CN103454905B (en) * | 2013-09-13 | 2015-12-02 | 烟台东方英达康自动化技术有限公司 | A kind of method for synchronizing time |
| CN104730919B (en) * | 2015-04-02 | 2017-03-01 | 西安电子科技大学 | A kind of big-dipper satellite time dissemination system and its method |
| CN105353602B (en) * | 2015-11-21 | 2018-01-12 | 广西南宁至简至凡科技咨询有限公司 | A kind of timing system based on GPS |
| CN109656126A (en) * | 2018-12-28 | 2019-04-19 | 武汉依迅电子信息技术有限公司 | Beidou can tame and docile time service method and device |
| CN110703586B (en) * | 2019-09-09 | 2022-02-18 | 广州市中海达测绘仪器有限公司 | Time synchronization method, data synchronization method, device, system, equipment and medium |
| CN110794439A (en) * | 2019-11-26 | 2020-02-14 | 国网思极神往位置服务（北京）有限公司 | High-precision time service, time keeping and positioning integrated system and method based on Beidou satellite system III |
| CN110837221B (en) * | 2019-11-27 | 2021-01-19 | 深圳市力合微电子股份有限公司 | Method for effectively improving time service reliability and continuity |
| CN112034697B (en) * | 2020-07-17 | 2022-06-10 | 中国科学院空天信息创新研究院 | High-precision RDSS time service method |
| CN113890662A (en) * | 2021-09-22 | 2022-01-04 | 北京计算机技术及应用研究所 | Multimode high-precision time service and keeping device |
| CN114114891B (en) * | 2021-11-30 | 2023-09-08 | 国网辽宁省电力有限公司葫芦岛供电公司 | Double Beidou satellite synchronous clock system and method |
| CN115079558A (en) * | 2022-06-16 | 2022-09-20 | 成都迅翼卫通科技有限公司 | Time service and keeping time method based on special synchronous chip |
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| JP3085511B2 (en) * | 1994-11-24 | 2000-09-11 | 株式会社アドバンテスト | Reference frequency generator |
| CN102064827B (en) * | 2010-11-11 | 2012-11-21 | 国网电力科学研究院 | Rubidium oscillator-based standard frequency and time adjusting method |
| CN102147474B (en) * | 2010-12-21 | 2012-11-14 | 西安市双合软件技术有限公司 | Time frequency taming module based on global position system (GSP)/compass navigation satellite system (CNSS) |
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Denomination of invention: One way timing taming system and method for Beidou No. 1 satellite system Effective date of registration: 20131204 Granted publication date: 20130619 Pledgee: Xi'an hi tech Development Zone Guoxin micro credit Co., Ltd. Pledgor: CHENGDU GOLDENWAY TECHNOLOGY CO., LTD. Registration number: 2013990000924 |
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