CN102411147A - 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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- CN102411147A CN102411147A CN2011104353085A CN201110435308A CN102411147A CN 102411147 A CN102411147 A CN 102411147A CN 2011104353085 A CN2011104353085 A CN 2011104353085A CN 201110435308 A CN201110435308 A CN 201110435308A CN 102411147 A CN102411147 A CN 102411147A
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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 a unidirectional time service of satellite system of a kind of Big Dipper and tame system and method.
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, and claims that again " Double-Star Positioning System " system or " No. one, the Big Dipper " system, this system adopt geosynchronous satellite to carry out navigator fix; Have very strong time service energy, the time service service range comprises China territory and south east asia, and the 3rd satellite of " No. one, the Big Dipper " system succeeded in sending up lift-off along with on May 25th, 2003; It is that various users provide stable and reliable localization, communicate by letter and time service is used that " No. one, the Big Dipper " system begins comprehensively, and the satellite time service is because broad covered area, the precision height; Advantages such as cost is relatively low are widely used, however satellite distance ground kilometers up to ten thousand, and the signal transmission is subject to disturb; And mostly satellite time service commonly used at present is two-way time service; The resolving time of location and time service is longer, and time service precision is relatively poor, at present; Time service commonly used is tamed system when no satellite-signal or satellite-signal fault; The precision and the stability that can not keep time service at short notice, restricted application, user's experience property is relatively poor.
Summary of the invention
The object of the invention promptly is to overcome the deficiency of prior art; Provide a unidirectional time service of satellite system of a kind of Big Dipper to tame system and method; Solve problems such as time service precision that Big Dipper satellite system causes because of the satellite beams fault at short notice and stability is not good, guaranteed when no satellite-signal or satellite-signal fault, also can keep the precision and the stability of time service at short notice; Have and improve time service precision and stability, advantage such as applied widely.
The object of the invention is realized through following technical scheme: system is tamed in a unidirectional time service of satellite system of the Big Dipper; It comprises punctual module and the crystal oscillator correcting module of being located in the FPGA; And be located at the crystal oscillator offset detection module in the DSP; Crystal oscillator offset detection module is connected with the crystal oscillator correcting module, and the crystal oscillator correcting module is connected with punctual module, and 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 counting set of inner punctual counter A and inner punctual counter B is connected with the counting output of time service time counter A and time service time counter B respectively, and time service time counter B is connected with punctual module, and inner punctual counter B is connected with the crystal oscillator correcting module.
Method is tamed in a unidirectional time service of satellite system of the Big Dipper, 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 side-play amount with respect to theoretical value automatically, and side-play amount is stored in the register; When treating that 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 the real-time monitor satellite of FPGA; When satellite losing lock or fault; Start synchronously punctual module and crystal oscillator correcting module; The crystal oscillator correcting module is cut into punctual pattern, in conjunction with punctual counter A in the inside of punctual module and inner punctual counter B, produces 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 through the FPGA frequency division, and a clock period produces a count value, when count value reaches a time in frame period; Then to the punctual counter B carry in 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; Be under the normal condition, each frame time, inner punctual counter A and inner punctual counter B are reset.
The invention has the beneficial effects as follows: the present invention provides a unidirectional time service of satellite system of the Big Dipper to tame system and method; Problems such as time service precision that Big Dipper satellite system causes because of the satellite beams fault at short notice and stability is not good have been solved; Guarantee when no satellite-signal or satellite-signal fault; Advantages such as the precision and the stability that also can keep time service at short notice have the time service precision of raising and stability, and is applied widely.
Description of drawings
Fig. 1 is a structured flowchart of the present invention;
Fig. 2 is the structured flowchart of inner punctual counter of the present invention and time service time counter.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further description, but protection scope of the present invention is not limited to the following stated.
Like Fig. 1, shown in Figure 2; System is tamed in a unidirectional time service of satellite system of the Big Dipper; It comprises punctual module and the crystal oscillator correcting module of being located in the FPGA, and is located at the crystal oscillator offset detection module in the DSP, and 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, and the carry output of inner punctual counter A is connected with the counting input of inner punctual counter B, and the counting set of inner punctual counter A and inner punctual counter B is connected with the counting output of time service time counter A and time service time counter B respectively; Time service time counter B is connected with punctual module, and inner punctual counter B is connected with the crystal oscillator correcting module.
Method is tamed in a unidirectional time service of satellite system of the Big Dipper, 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 side-play amount with respect to theoretical value automatically, and side-play amount is stored in the register; When treating that 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 the real-time monitor satellite of FPGA; When satellite losing lock or fault; Start synchronously punctual module and crystal oscillator correcting module; The crystal oscillator correcting module is cut into punctual pattern, in conjunction with punctual counter A in the inside of punctual module and inner punctual counter B, produces 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 through the FPGA frequency division, and a clock period produces a count value, when count value reaches a time in frame period; Then to the punctual counter B carry in 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; Be under the normal condition, each frame time, inner punctual counter A and inner punctual counter B are reset.
Claims (2)
1. system is tamed in a unidirectional time service of satellite system of the Big Dipper; It is characterized in that: it comprises punctual module and the crystal oscillator correcting module of being located in the FPGA; And be located at the crystal oscillator offset detection module in the DSP; Crystal oscillator offset detection module is connected with the crystal oscillator correcting module; The crystal oscillator correcting module is connected with punctual module, and punctual module comprises inner punctual counter A and inner punctual counter B, and the carry output of inner punctual counter A is connected with the counting input of inner punctual counter B; The counting set of inner punctual counter A and inner punctual counter B is connected with the counting output of time service time counter A and time service time counter B respectively, and inner punctual counter B is connected with the crystal oscillator correcting module.
2. method is tamed in a unidirectional time service of satellite system of the Big Dipper, 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 side-play amount with respect to theoretical value automatically, and side-play amount is stored in the register, when treating that the next frame time arrives, side-play amount is inserted in the crystal oscillator correcting module of FPGA;
The real-time monitor satellite state of crystal oscillator correction: FPGA; When satellite losing lock or fault; Start synchronously punctual module and crystal oscillator correcting module; The crystal oscillator correcting module is cut into punctual pattern, in conjunction with punctual counter A in the inside of punctual module and inner punctual counter B, produces 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 through the FPGA frequency division; A clock period produces a count value, when count value reaches a time in frame period, then to the punctual counter B carry in inside; Simultaneously; Each frame time, the count value of time service time counter A and time service time counter B are all inserted inner punctual counter A and inner punctual counter B, count value and time service time synchronized; Be under the normal condition, inner punctual counter A of the time of each frame and inner punctual counter B are reset.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103399808A (en) * | 2013-06-06 | 2013-11-20 | 北京航天自动控制研究所 | Method for achieving crystal oscillator dual redundancy in flight control computer |
| CN103454905A (en) * | 2013-09-13 | 2013-12-18 | 烟台东方英达康自动化技术有限公司 | Method for synchronizing time |
| CN104730919A (en) * | 2015-04-02 | 2015-06-24 | 西安电子科技大学 | Beidou satellite timing system and method |
| CN105353602A (en) * | 2015-11-21 | 2016-02-24 | 广西南宁至简至凡科技咨询有限公司 | GPS-based time correction system |
| 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 |
| CN110703586A (en) * | 2019-09-09 | 2020-01-17 | 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 |
| CN110837221A (en) * | 2019-11-27 | 2020-02-25 | 深圳市力合微电子股份有限公司 | Method for effectively improving time service reliability and continuity |
| CN112034697A (en) * | 2020-07-17 | 2020-12-04 | 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 |
| CN114114891A (en) * | 2021-11-30 | 2022-03-01 | 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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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103399808A (en) * | 2013-06-06 | 2013-11-20 | 北京航天自动控制研究所 | Method for achieving crystal oscillator dual redundancy in flight control computer |
| 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 |
| CN103454905A (en) * | 2013-09-13 | 2013-12-18 | 烟台东方英达康自动化技术有限公司 | Method for synchronizing time |
| 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 |
| CN104730919A (en) * | 2015-04-02 | 2015-06-24 | 西安电子科技大学 | Beidou satellite timing system and method |
| CN105353602A (en) * | 2015-11-21 | 2016-02-24 | 广西南宁至简至凡科技咨询有限公司 | GPS-based time correction system |
| 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 |
| CN110703586A (en) * | 2019-09-09 | 2020-01-17 | 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 |
| 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 |
| CN110837221A (en) * | 2019-11-27 | 2020-02-25 | 深圳市力合微电子股份有限公司 | Method for effectively improving time service reliability and continuity |
| CN112034697A (en) * | 2020-07-17 | 2020-12-04 | 中国科学院空天信息创新研究院 | High-precision RDSS time service method |
| 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 |
| CN114114891A (en) * | 2021-11-30 | 2022-03-01 | 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 |
| 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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