CN102540211A - BD-1 (Big Dipper No. 1) satellite multiple crystal oscillator time service system and method thereof - Google Patents
BD-1 (Big Dipper No. 1) satellite multiple crystal oscillator time service system and method thereof Download PDFInfo
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- CN102540211A CN102540211A CN2011104353121A CN201110435312A CN102540211A CN 102540211 A CN102540211 A CN 102540211A CN 2011104353121 A CN2011104353121 A CN 2011104353121A CN 201110435312 A CN201110435312 A CN 201110435312A CN 102540211 A CN102540211 A CN 102540211A
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Abstract
The invention discloses a BD-1 (Big Dipper No. 1) satellite multiple crystal oscillator time service system, which comprises at least two crystal oscillators, at least two timers and a weighted average calculating unit. A frequency output of each crystal oscillator is connected with the corresponding timer. An output of each timer is connected with one input of the weighted average calculating unit. The weighted average calculating unit is used for carrying out weighted averaging on input timing values received by the weighted average calculating unit so as to achieve a final system clock. A method of the BD-1 satellite multiple crystal oscillator time service system comprises the following steps that the crystal oscillators independently generate reference clocks; and the reference clocks are sent to the timers to be timed and the weighted average of the timing outputs of the timers is calculated to obtain the system clock. According to the invention, after a plurality of clock signals are generated by adopting a plurality of crystal oscillators, the clock signals are respectively subjected to fine adjustment by timer fine adjusting modules and then are subjected to weighted averaging calculation by a weighted average calculating unit. The BD-1 satellite multiple crystal oscillator time service system and the method have the characteristics of good time service accuracy, small system error and the like.
Description
Technical field
The present invention relates to satellite polycrystalline of a kind of Big Dipper shake time dissemination system and method thereof.
Background technology
Beidou satellite navigation system is the independent development capability implemented of China, the GPS of independent operating, and Big Dipper navigation experiment system has had widely in a lot of fields such as mapping, telecommunications, water conservancy, communications and transportation, forest fire protection and public safety and uses at present.In June, 2010, the 4th Big Dipper Navsat " Long March No. three third " successfully sent into the space planned orbit, and this indicates that China's Beidou satellite navigation system engineering construction has stepped essential step again, and the satellite networking moves forward steadily just according to plan.
Satellite timing method of traditional Big Dipper all adopts a crystal oscillator and timer to come the clock of drive system, is just exported as final clock signal later on through the fine setting of timer by the clock signal that crystal oscillator produces.We know; Generally there is the manufacturing frequency deviation about 0.5ppm in crystal oscillator; Generally the system clock per second can produce the error of 500 nanoseconds, has surmounted the restriction of 100 nanoseconds of time dissemination system requirement far away, that is to say; Use traditional single crystal oscillator time service method, Timing Receiver multipotency under the situation that satellite-signal interrupts kept 1 minute.
Summary of the invention
The objective of the invention is to solve the deficiency of existing Big Dipper satellite crystal oscillator time dissemination system and method thereof; Satellite polycrystalline of a kind of novel Big Dipper shake time dissemination system and method thereof are provided; Overcome traditional time dissemination system and method thereof and adopt the single crystal oscillator time service, time service poor accuracy, shortcoming such as reliability is not high enough and systematic error is big.
The objective of the invention is to realize: satellite polycrystalline of Big Dipper time dissemination system that shakes through following technical scheme; It comprises at least two crystal oscillators, at least two timers and a weighted mean value computing unit; The frequency output of each crystal oscillator is connected with timer; The output of each timer is connected with an input of weighted mean value computing unit, and the weighted mean value computing unit carries out weighted mean to the input clocking value of its reception, reaches final system clock.
Satellite polycrystalline of Big Dipper time service method that shakes, the characteristics of utilizing the crystal oscillator probability of error to distribute use a plurality of crystal oscillators to reduce the system clock error, and it may further comprise the steps:
(1) every road crystal oscillator independently produces reference clock, and this reference clock send the timer timing;
(2) the weighted mean value computing unit is delivered in the clocking value output of each road timer; Calculate weighted mean value by the weighted mean value computing unit; Obtain system clock; Because the direction of the random frequency of each crystal oscillator skew is inconsistent, fractional error will be cancelled, and the result after the counteracting is more near the real time.
The present invention also comprises a timer trim step, and timer fine setting module is finely tuned the time stepping, and this step is revised the intrinsic frequency deviation of crystal oscillator.
Individual error is arranged between the actual frequency of crystal oscillator and the nominal frequency, comprises two sources:
(1) wherein major part comes from foozle, is the fixed error value, measures through the centre frequency to single crystal oscillator, can obtain this value.Every road timer carries out the correction of time stepping length according to this value, to reach more accurate timing.
(2) other part comes from environmental impact and crystal oscillator self characteristics, is the stochastic error value, and proportion is less.Weighted mean is carried out in output to the Multipath timing device, can offset a part of stochastic error value.
The invention has the beneficial effects as follows: after the employing polycrystalline shakes and produces a plurality of reference clock signals, through timer timing and fine setting, carry out weighted average calculation by the weighted mean value computing unit more respectively; Because synchronization; The direction of the random frequency skew of each crystal oscillator is inconsistent, and fractional error will be cancelled, according to probability distribution; The crystal oscillator quantity of using is many more; Frequency is just approaching more to the total amount of both direction skew, and the result of weighted average of offsetting the back gained is more near actual time, and accuracy good, the systematic error of time service are little.
Description of drawings
Fig. 1 is a time dissemination system structural representation block diagram of the present invention;
Fig. 2 is a time service method process flow diagram of the present invention.
Embodiment
Further describe technical scheme of the present invention below in conjunction with accompanying drawing: as shown in Figure 1; Satellite polycrystalline of Big Dipper time dissemination system that shakes; It comprises four crystal oscillators, four timers and a weighted mean value computing unit, and the frequency output of each crystal oscillator is connected with timer, and the output of each timer is connected with an input of weighted mean value computing unit; The weighted mean value computing unit carries out weighted mean to the input clocking value of its reception, reaches final system clock.
As shown in Figure 2, satellite polycrystalline of Big Dipper time service method that shakes, the characteristics of utilizing the crystal oscillator probability of error to distribute use a plurality of crystal oscillators to reduce the system clock error, and it may further comprise the steps:
(1) every road crystal oscillator independently produces reference clock, and this reference clock send the timer timing;
(2) the weighted mean value computing unit is delivered in the clocking value output of each road timer; Calculate weighted mean value by the weighted mean value computing unit; Obtain system clock; Because the direction of the random frequency of each crystal oscillator skew is inconsistent, fractional error will be cancelled, and the result after the counteracting is more near the real time.
It also comprises a timer trim step, and timer fine setting module is finely tuned the time stepping, and this step is revised the intrinsic frequency deviation of crystal oscillator.
Claims (3)
1. satellite polycrystalline of Big Dipper time dissemination system that shakes; It is characterized in that: it comprises at least two crystal oscillators, at least two timers and a weighted mean value computing unit; The frequency output of each crystal oscillator is connected with timer; The output of each timer is connected with an input of weighted mean value computing unit, and the weighted mean value computing unit carries out weighted mean to the input clocking value of its reception, reaches final system clock.
2. satellite polycrystalline of Big Dipper time service method that shakes, the characteristics of utilizing the crystal oscillator probability of error to distribute use a plurality of crystal oscillators to reduce the system clock error, and it is characterized in that: it may further comprise the steps:
(1) every road crystal oscillator independently produces reference clock, and this reference clock send the timer timing;
(2) the weighted mean value computing unit is delivered in the clocking value output of each road timer; Calculate weighted mean value by the weighted mean value computing unit; Obtain system clock; Because the direction of the random frequency of each crystal oscillator skew is inconsistent, fractional error will be cancelled, and the result after the counteracting is more near the real time.
3. satellite polycrystalline of the Big Dipper according to claim 2 time service method that shakes, it is characterized in that: it also comprises a timer trim step, this step is revised the intrinsic frequency deviation of crystal oscillator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011104353121A CN102540211A (en) | 2011-12-22 | 2011-12-22 | BD-1 (Big Dipper No. 1) satellite multiple crystal oscillator time service system and method thereof |
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| CN2011104353121A CN102540211A (en) | 2011-12-22 | 2011-12-22 | BD-1 (Big Dipper No. 1) satellite multiple crystal oscillator time service system and method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104375414A (en) * | 2014-11-14 | 2015-02-25 | 国家电网公司 | Time consuming device time service method and device based on multiple time sources |
| CN114488766A (en) * | 2022-01-25 | 2022-05-13 | 浙江赛思电子科技有限公司 | Clock time service method, device and medium |
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| US20020011948A1 (en) * | 2000-04-27 | 2002-01-31 | Weedon Robert John | Electronic timing systems. |
| CN1585273A (en) * | 2004-05-26 | 2005-02-23 | 中兴通讯股份有限公司 | Method for realizing clock interactive synchronization |
| CN102004258A (en) * | 2010-09-09 | 2011-04-06 | 中国计量科学研究院 | Time frequency transfer method and receiver based on multiple global navigation satellite system (GNSS) integration |
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| US20020011948A1 (en) * | 2000-04-27 | 2002-01-31 | Weedon Robert John | Electronic timing systems. |
| CN1585273A (en) * | 2004-05-26 | 2005-02-23 | 中兴通讯股份有限公司 | Method for realizing clock interactive synchronization |
| CN102004258A (en) * | 2010-09-09 | 2011-04-06 | 中国计量科学研究院 | Time frequency transfer method and receiver based on multiple global navigation satellite system (GNSS) integration |
Non-Patent Citations (2)
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| 党晓圆等: "基于GPS与北斗双模授时的压控晶振校频***的研究与设计", 《计算机测量与控制》, vol. 17, no. 11, 30 November 2009 (2009-11-30), pages 2246 - 2248 * |
| 赵军祥等: "GPS 授时校频方法研究与试验结果", 《北京航空航天大学学报》, vol. 30, no. 8, 31 August 2004 (2004-08-31), pages 762 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104375414A (en) * | 2014-11-14 | 2015-02-25 | 国家电网公司 | Time consuming device time service method and device based on multiple time sources |
| CN114488766A (en) * | 2022-01-25 | 2022-05-13 | 浙江赛思电子科技有限公司 | Clock time service method, device and medium |
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Application publication date: 20120704 |