CN103048919A - Channel delay test-based satellite clock self-adjusting method - Google Patents
Channel delay test-based satellite clock self-adjusting method Download PDFInfo
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Abstract
The invention discloses a channel delay test-based satellite clock self-adjusting method. The method comprises the following steps of: firstly, performing data packet transmitting/receiving test on a test channel by taking a standard clock source as a clock timer on the ground to obtain a channel transmission standard delay test value; secondly, arranging a clock source to be debugged and the test channel serving as additional devices in a satellite, and sending the clock source to be debugged and the test channel into the space along with the satellite; thirdly, performing the data packet transmitting/receiving test on the test channel to obtain an on-satellite channel delay test value by taking the clock source to be debugged as the clock timer when the satellite runs in space; fourthly, analyzing the ground test result and the space test result tested by the same test channel, and acquiring the timing frequency deviation between the current clock source to be debugged and a ground standard clock source; and finally, determining the timing and frequency difference values which are required to be adjusted according to the frequency difference of the two clock sources and the adjusted time interval, namely compensating the clock source to be debugged to complete the adjustment of a satellite clock.
Description
Technical field
The present invention relates to a kind of satellite clock self-adjusting method based on the channel delay test, exactly, relate in a kind of satellite communication scene, change satellite clock self-regulation or the punctual method of self-tuning clock that causes clock timing that skew occurs and take for clock frequency, belong to satellite clock from punctual technical field.
Background technology
In the scene of wire communication, implementing such as TDM service TDM(Time Division Multiplexing) when data were processed, data transmission set need to guarantee that the terminal device clock that communicates with one another can be synchronous.Yet, because the communication facilities at two ends is different as the clock crystal oscillator of clock source, and being subject to the impact of other factors of equipment external environment, the clock between these two equipment will produce the nonsynchronous phenomenon of timing.Because the crystal oscillator device of the clock source of each inside communication equipment is under the factor affecting such as temperature, air pressure or electromagnetic radiation, the crystal oscillator frequency of operation can change.Therefore the deviation on will the generation time timing between two communication facilitiess.
Particularly under the satellite communication scene, the influence degree that crystal oscillator is subject to the factors such as temperature, air pressure or electromagnetic radiation is more obvious than ground scene.Simultaneously, because restriction and the impact of means of communication, satellite communication is usually blocked.So only rely on the clock alignment of communication link transmission often can not satisfy the demand of clock synchronous.Therefore, satellite clock just becomes a part indispensable in the satellite clock simultaneous techniques from punctual technology.
For guaranteeing the reliability of the clock real-time synchronization between the communication facilities, need to take the punctual two aspect technology of clock alignment and clock to guarantee.At present, the clock alignment technology is mainly used in the higher clockwork of clock accuracy, with the time service mode to its carry out clock counter synchronously, such as global position system GPS (Global Positioning System) etc.Perhaps by the transmitted in both directions synchronous protocol, try to achieve the means of communicating by letter the two ends clock jitter and revising, the clock timing of keeping equipment is accurate, as
Accurate clock synchronization protocolPTP(Precise time protocol) agreement.But these method costs are higher, and relevant art is subject to the restriction of communications accessibility.Moreover, if adopt merely the clock alignment technology, within the quiescent interval of clock alignment, can not guarantee that still the clock timing of communication facilities is synchronous.
Especially in satellite communication system, at satellite and ground communication is obstructed or in interval time at itself and other satellite time transfer, in the clock synchronous link between satellite and land station, how to guarantee the precisely punctual of satellite clock, become the in the industry focus problem of scientific and technical personnel's concern.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of satellite clock self-adjusting method based on the channel delay test, the method is based on result to the fixed channel delay testing as comparison basis, and the elapsed time clock of satellite communication is carried out self-regulation or adaptive synchronous adjustment.The present invention can reduce the clock timing deviation that " clock source to be transferred " and " standard clock source " causes because of frequency jitter, and its operation steps is simple, cheap, realize easily, be particularly suitable for the synchronously communications applications scene of certainly punctual demand of satellite clock.
In order to achieve the above object, the invention provides a kind of satellite clock self-adjusting method based on the channel delay test, it is characterized in that: before satellite launch, utilize first " standard clock source " as clock timer on ground, " test channel " carried out the transmitting-receiving test of packet, obtain " transmission standard delay testing value "; In the satellite launch preparatory stage, " clock source to be transferred " and " test channel " is arranged in the satellite as the satellite attaching device again, sends into space with satellite; And at satellite at the space run duration, utilize " clock source to be transferred " as clock timer, " test channel " carried out the transmitting-receiving test of packet, obtain " star upper signal channel delay testing value "; Then, two test results utilizing respectively identical " test channel " to carry out the data packet transmission delay testing from ground and space are analyzed contrast, know current " clock source to be transferred " toggle rate and the ratio between two of the toggle rate of " standard clock source " on ground or both timing offset amounts in space; At last, according to the difference on the frequency of these two clock sources and the time interval of adjustment, need to determine timing and the frequency of operation difference of adjustment, namely present timing value and the frequency of operation of " clock source to be transferred " are compensated adjustment, finish the timing adjustment of satellite clock.
The present invention is with the innovation advantage that other Clock Synchronization Technology are compared: its operation steps is very simple, equipment needed thereby is few, and is cheap, realizes easily, and implementation and means variation need not the auxiliary punctual purpose that just can finish satellite clock of other specific installations.And difficulty in computation is low, and the error component that affects the satellite clock timing is few.The present invention also can be used for other and have the communications applications scene of clock synchronous demand.
Description of drawings
Fig. 1 is the satellite clock self-adjusting method operation steps process flow diagram that the present invention is based on the channel delay test.
Fig. 2 is that the structure of satellite clock self-adjusting method embodiment proving installation of the present invention forms synoptic diagram.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with drawings and Examples.
The present invention is based on the satellite clock self-adjusting method of channel delay test, before satellite launch, utilize first " standard clock source " as clock timer on ground, " test channel " carried out the transmitting-receiving test of packet, obtain " transmission standard delay testing value "; In the satellite launch preparatory stage, " clock source to be transferred " and " test channel " is arranged in the satellite as the satellite attaching device again, sends into space with satellite; And in satellite transit during space, utilize " clock source to be transferred " as clock timer, " test channel " carried out the transmitting-receiving test of packet, obtain " star upper signal channel delay testing value "; Then, two test results utilizing respectively identical " test channel " to test from ground and space are analyzed contrast, know current " clock source to be transferred " toggle rate and the ratio between two of the toggle rate of " standard clock source " on ground or both timing offset amounts in space; At last, according to the difference on the frequency of these two clock sources and the time interval of adjustment, need to determine timing difference and the frequency of operation difference of adjustment, namely current time timing numerical value and the frequency of operation of " clock source to be transferred " are compensated adjustment, finish the timing adjustment of satellite clock.
Referring to Fig. 1, introduce two concrete operation steps of the inventive method:
Step 1, the measuring phases of transmission standard time delay: before satellite launch, adopt " standard clock source " to carry out the propagation delay time test on ground in the face of " test channel ", and the store test results data.
This step is punctual initialization operation of the present invention, and the concrete operations content is:
(11) with " standard clock source " elapsed time clock as the test channel interface controller in " test channel ": when assisting " test interface controller " to carry out the test of data packet transceive bag, provide packet to leave and arrive the time value of " test interface controller ".
(12) with " test interface controller " test channel implementation data pack receiving and transmitting bag is tested, after when finishing the transmitting-receiving tester of packet, obtain two time values poor that this packet left and arrived this test channel controller: the difference of these two time values is exactly the propagation delay time of this packet on " test channel ", i.e. transmission standard delay testing value Z
1
Step 2, synchronously self-correcting stage: behind satellite launch, with the clock source that is used as clock timer in the telstar as an alternative " standard clock source " measure the propagation delay time of " test channel " as the timing device of satellite; Again the measurement result that obtains and the test result of step 1 are analyzed comparison, calculate and to carry out the numerical value that clocking value and frequency of operation are adjusted to the clock source in this telstar.
During the satellite in this stage the motor synchronizing scene be run on satellite since be obstructed with ground communication or with other satellite time transfer sections interval time in, by the operating result in this stage, can directly adjust clock timing value and the frequency of operation of this satellite.This step stage comprises following content of operation:
(21) initialization is prepared: will " clock source to be transferred " as the elapsed time clock of test channel interface controller, be used for to assist the test interface controller when the transmitting-receiving time timing test of carrying out packet, provide packet to leave and arrive the time value of test interface controller.
(22) the test channel interface controller carries out data transmission transmitting-receiving test to test channel: leave and arrive two time values poor of test interface controller with packet, as the propagation delay time Z of this packet on " test channel "
2, i.e. star upper signal channel delay testing value.
(23) process test result: according to star upper signal channel delay testing amount Z
2With standard channel delay testing value Z
1Calculate, " clock source to be transferred " that obtain this moment needs time clocking value and the frequency of operation of adjustment:
If the work at present frequency of satellite when space moves is F
2" standard clock source " frequency of operation during with ground survey is F
1Since in the same time interval, frequency of operation and the proportional relation of clock timing value:
Then pass through the setting-up time interval T, satellite need to be according to the clock timing offset Z of following two formula calculating at every turn
T1: Z
T1=Z
1-Z
2With clock frequency offset F
T1:
Adjust.
(24) elapsed time clock is compensated adjustment: according to clock compensation value Z
T1With clock frequency offset F
T1Time timing and frequency of operation value to " clock source to be transferred " are carried out self-adaptation adjustment or self-regulation, namely its time clocking value and frequency of operation are compensated accordingly.
(25) finish the current compensation adjustment cycle: return step (22), carry out next time self-adaptation adjustment or self-regulation cycle.
Referring to Fig. 2, the structure of introducing embodiment of the invention proving installation forms:
Standard clock source: the clock apparatus that can carry out timing with stable frequency of operation (for example: atomic clock), require its frequency accuracy not to be subject to environmental change impact; This device only uses on ground, does not go up to the air with satellite launch.
Clock source to be transferred: its crystal oscillator migration parameter is less than the clock apparatus of 10ppm, from heavy and light, and with satellite delivery lift-off; Be subject to the impact of temperature and pressure change, when deviation appearred in its toggle rate, the clock timing difference that the satellite clock self-adjusting method that utilization is tested based on channel delay calculates compensated adjustment to timing and frequency of operation deviation.
Test channel device: formed by " test channel interface controller " and connected " test channel ".The test channel interface controller is for the interface arrangement to connected test channel implementation data bag sending and receiving, and when packet leaves and arrives this interface arrangement, the clock timing numerical value that record present timing clock is put down in writing is used for the propagation delay time that computational data wraps in test channel; This test interface controller is to adopt the Programmable Logic Device device that comprises on-site programmable gate array FPGA (Field-Programmable Gate Array) or complex programmable logic device (CPLD) (Complex Programmable Logic Device) to realize.Test channel is optical cable or the cable with setpoint distance length; its outer " channel guard medium " that is arranged with vacuum or polyvinylchloride (PolyVinyl Chloride) constant temperature plastics; so that the temperature of the data transmission media of this test channel and pressure all are in steady state (SS); data-signal can transmit under constant temperature and constant voltage environment, the actual transmissions time-delay deviation that produces should less than ten thousand of propagation delay time in the conventional environment of ground/.
Each interface function among Fig. 2 is introduced:
1: the timer time counting interface of standard clock source: be used for the time clocking value that transmission is produced by the clock signal of standard clock source crystal oscillator.
2: the timer time counting interface of clock source to be transferred: be used for the time clocking value that transmission is produced by the clock signal of clock source crystal oscillator to be transferred.
3: the timer time of clock source to be transferred is adjusted data-interface: be used for transmitting the clock timing of clock source to be transferred and the side-play amount of frequency of operation, i.e. clock timing and frequency of operation offset.
4: the bidirectional interface of test data transmission: transmission of data signals when receiving and send test packet.
The present invention has carried out repeatedly implementing test, and experimental result is successfully, has realized goal of the invention.
Claims (7)
1. satellite clock self-adjusting method based on channel delay test, it is characterized in that: before satellite launch, utilize first " standard clock source " as clock timer on ground, " test channel " carried out the transmitting-receiving test of packet, obtain " transmission standard delay testing value "; In the satellite launch preparatory stage, " clock source to be transferred " and " test channel " is arranged in the satellite as the satellite attaching device again, sends into space with satellite; And at satellite at the space run duration, utilize " clock source to be transferred " as clock timer, " test channel " carried out the transmitting-receiving test of packet, obtain " star upper signal channel delay testing value "; Then, two test results utilizing respectively identical " test channel " to carry out the data packet transmission delay testing from ground and space are analyzed contrast, know current " clock source to be transferred " toggle rate and the ratio between two of the toggle rate of " standard clock source " on ground or both timing offset amounts in space; At last, according to the difference on the frequency of these two clock sources and the time interval of adjustment, need to determine timing and the frequency of operation difference of adjustment, namely present timing value and the frequency of operation of " clock source to be transferred " are compensated adjustment, finish the timing adjustment of satellite clock.
2. method according to claim 1, it is characterized in that: described " standard clock source " is to comprise clock apparatus atomic clock, that can carry out with stable frequency of operation timing, requires its frequency accuracy not to be subject to the environmental change impact; This device only uses on ground, does not go up to the air with satellite launch.
3. method according to claim 1 is characterized in that: described " clock source to be transferred " is that its crystal oscillator migration parameter is less than the clock apparatus of 10ppm, from heavy and light, and with satellite delivery lift-off; Be subject to the impact of temperature and pressure change, when deviation appears in its toggle rate, the clock timing side-play amount that the satellite clock self-adjusting method that utilization is tested based on channel delay calculates and the deviation of frequency of operation compensate adjustment to time timing and frequency of operation deviation.
4. method according to claim 1, it is characterized in that: described " test channel " device is comprised of the connected test channel of test channel interface controller, described test channel interface controller is for the interface arrangement to connected test channel implementation data bag sending and receiving, and when packet leaves and arrives this interface arrangement, the clock timing numerical value that record present timing clock is put down in writing is used for the propagation delay time that computational data wraps in test channel; This test interface controller is to adopt the Programmable Logic Device device that comprises on-site programmable gate array FPGA or complex programmable logic device (CPLD) to realize; Described test channel is optical cable or a cable with setpoint distance length; its outer protective medium that is arranged with vacuum or polyvinylchloride constant temperature plastics; so that the temperature of the data transmission media of this test channel and pressure all are in steady state (SS); data-signal can transmit under constant temperature and constant voltage environment, the actual transmissions time-delay deviation that produces should less than ten thousand of propagation delay time in the conventional environment of ground/.
5. method according to claim 1, it is characterized in that: described method comprises following two operation stepss:
(1) the standard time delay of measurement channel transmission time delay: before satellite launch, adopt " standard clock source " to carry out the data packet transmission delay testing on ground in the face of " test channel ", and the store test results data;
(2) synchronously self-correcting: behind satellite launch, substitute " standard clock source " as the timing device of satellite with the clock source that is used as clock timer in the telstar, measure the propagation delay time of " test channel "; Again the measurement result that obtains and the test result of step (1) are analyzed comparison, calculate and to carry out the numerical value that timing and frequency of operation are adjusted to the clock source in this telstar.
6. method according to claim 5, it is characterized in that: described step (1) is punctual initialization operation, the concrete operations content is: with " standard clock source " elapsed time clock as the test channel interface controller in " test channel ", when finishing the transmitting-receiving tester of packet, obtain two time values that this packet left and arrived this test channel controller; The difference of these two time values is exactly the propagation delay time of this packet on " test channel ": i.e. standard channel delay testing value Z
1
7. method according to claim 5, it is characterized in that: described step (2) comprises following content of operation:
(21) initialization is prepared: will " clock source to be transferred " as the elapsed time clock of test channel interface controller, be used for to assist the test interface controller when the transmitting-receiving timing test of carrying out packet, provide packet to leave and arrive the time value of test interface controller;
(22) the test channel interface controller carries out data transmission transmitting-receiving test to test channel: leave and arrive two time values poor of test interface controller with packet, as the propagation delay time Z of this packet on " test channel "
2, i.e. star upper signal channel delay testing value;
(23) process test result: according to star upper signal channel delay testing amount Z
2With standard channel delay testing value Z
1Calculate, " clock source to be transferred " that obtain this moment needs time timing and the frequency of operation value of adjustment:
If the work at present frequency of satellite when space moves is F
2" standard clock source " frequency of operation during with ground survey is F
1Since in the same time interval, frequency of operation and the proportional relation of clock timing value:
Then pass through the setting-up time interval T, satellite need to calculate and the clock compensation value Z that obtains according to following two formula at every turn
T1: Z
T1=Z
1-Z
2With clock frequency offset F
T1:
Adjust:
(24) elapsed time clock is compensated adjustment: according to clock compensation value Z
T1With clock frequency offset F
T1Time timing and frequency of operation value to " clock source to be transferred " are carried out self-adaptation adjustment or self-regulation, namely its time clocking value and frequency of operation are compensated accordingly;
(25) finish the current compensation adjustment cycle: return step (22), carry out next time self-adaptation adjustment or self-regulation cycle.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106647223A (en) * | 2016-10-13 | 2017-05-10 | 中国电子科技集团公司第二十研究所 | Quick stable real-time adjustment method for atomic clock timing |
| CN109561497A (en) * | 2018-12-27 | 2019-04-02 | 山东山大电力技术股份有限公司 | A kind of wireless synchronization method and system applied to one master and multiple slaves equipment |
| CN109634095A (en) * | 2018-12-26 | 2019-04-16 | 上海微小卫星工程中心 | Satellite clock system and satellite clock calibration method |
| CN113467219A (en) * | 2021-06-29 | 2021-10-01 | 中国西安卫星测控中心 | High-precision satellite-ground time difference calculation method for unified measurement and control equipment |
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| CN102566408A (en) * | 2010-12-10 | 2012-07-11 | 上海卫星工程研究所 | Calibration system for satellite clock and calibration method thereof |
| CN102830612A (en) * | 2012-09-10 | 2012-12-19 | 中央电视台 | System and method of high-precision time service and time keeping of broadcast controller |
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| CN1405994A (en) * | 2002-11-08 | 2003-03-26 | 清华大学 | Transmission agreement special for TP-S satellite channel |
| US20110228885A1 (en) * | 2010-03-18 | 2011-09-22 | Hook And Time Co., Ltd. | Time synchronization system via two-way interactive wireless communication |
| CN102566408A (en) * | 2010-12-10 | 2012-07-11 | 上海卫星工程研究所 | Calibration system for satellite clock and calibration method thereof |
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Cited By (5)
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| CN106647223A (en) * | 2016-10-13 | 2017-05-10 | 中国电子科技集团公司第二十研究所 | Quick stable real-time adjustment method for atomic clock timing |
| CN109634095A (en) * | 2018-12-26 | 2019-04-16 | 上海微小卫星工程中心 | Satellite clock system and satellite clock calibration method |
| CN109561497A (en) * | 2018-12-27 | 2019-04-02 | 山东山大电力技术股份有限公司 | A kind of wireless synchronization method and system applied to one master and multiple slaves equipment |
| CN109561497B (en) * | 2018-12-27 | 2021-06-22 | 山东山大电力技术股份有限公司 | Wireless synchronization method and system applied to one master device and multiple slave devices |
| CN113467219A (en) * | 2021-06-29 | 2021-10-01 | 中国西安卫星测控中心 | High-precision satellite-ground time difference calculation method for unified measurement and control equipment |
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Address after: 518000 Guangdong city of Shenzhen province Qianhai Shenzhen Hong Kong cooperation zone before Bay Road No. 1 building 201 room A (located in Shenzhen Qianhai business secretary Co. Ltd.) Patentee after: Smart information service (Shenzhen) Co.,Ltd. Address before: 518000 Guangdong city of Shenzhen province Qianhai Shenzhen Hong Kong cooperation zone before Bay Road No. 1 building 201 room A (located in Shenzhen Qianhai business secretary Co. Ltd.) Patentee before: Lingzhi (Shenzhen) Information Service Co.,Ltd. Address after: 518000 Guangdong city of Shenzhen province Qianhai Shenzhen Hong Kong cooperation zone before Bay Road No. 1 building 201 room A (located in Shenzhen Qianhai business secretary Co. Ltd.) Patentee after: Lingzhi (Shenzhen) Information Service Co.,Ltd. Address before: 518000 Guangdong city of Shenzhen province Qianhai Shenzhen Hong Kong cooperation zone before Bay Road No. 1 building 201 room A (located in Shenzhen Qianhai business secretary Co. Ltd.) Patentee before: WEISHIBO INFORMATION SERVICE (SHENZHEN) Co.,Ltd. |
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Effective date of registration: 20201224 Address after: 232000 high tech Industrial Park, high tech Zone, Huainan City, Anhui Province Patentee after: Anhui grizzly Shichuang Technology Co.,Ltd. Address before: 518000 Room 201, building A, No. 1, Qian Wan Road, Qianhai Shenzhen Hong Kong cooperation zone, Shenzhen, Guangdong (Shenzhen Qianhai business secretary Co., Ltd.) Patentee before: Smart information service (Shenzhen) Co.,Ltd. |
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Denomination of invention: Satellite Clock Self Adjustment Method Based on Channel Delay Testing Effective date of registration: 20230831 Granted publication date: 20140917 Pledgee: Huainan Zhongchuang Technology Industry Financing Guarantee Co.,Ltd. Pledgor: Anhui grizzly Shichuang Technology Co.,Ltd. Registration number: Y2023980054659 |