CN106909071A - A kind of spacecraft synchronization accuracy test system and method based on pulse per second (PPS) - Google Patents
A kind of spacecraft synchronization accuracy test system and method based on pulse per second (PPS) Download PDFInfo
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- CN106909071A CN106909071A CN201710103772.1A CN201710103772A CN106909071A CN 106909071 A CN106909071 A CN 106909071A CN 201710103772 A CN201710103772 A CN 201710103772A CN 106909071 A CN106909071 A CN 106909071A
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- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
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- G—PHYSICS
- G04—HOROLOGY
- G04F—TIME-INTERVAL MEASURING
- G04F10/00—Apparatus for measuring unknown time intervals by electric means
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Abstract
A kind of spacecraft synchronization accuracy test system and method based on pulse per second (PPS), system composition include：Navigation neceiver emulator, navigation neceiver, spaceborne time management facility, pulse per second (PPS) using terminal, logic analyser, surface power supply power supply, terminal ground checkout equipment, navigation neceiver prosecutor equipment, test client computer.The hardware pps pulse per second signal that the controlling cycle pulse of pulse per second (PPS) using terminal is provided with navigation neceiver is compared using logic analyser, obtains pulse per second (PPS) synchronization accuracy between terminal and navigation neceiver.System employs the telemetered signal of pulse per second (PPS) using terminal record, is capable of the actual parameter value of quick obtaining controlling cycle pulse, the output valve of the hardware pulse per second (PPS) read by logic analyser, can conveniently realize the calculating and test of pulse per second (PPS) synchronization accuracy.
Description
Technical field
The present invention relates to a kind of spacecraft synchronization accuracy test system and method based on pulse per second (PPS), it is particularly suited for large-scale
The test of satellite system irrespective of size pulse per second (PPS) synchronization accuracy.
Background technology
Pulse per second (PPS) time management mode is a kind of mainstream technology for realizing that spacecraft chronometer time is synchronous, it is necessary first to navigated
Receiver normally locks navigation signal, and (such as gps navigation message is tight with gps time to export whole pulse per second (PPS) under the instruction control of whole star
Lattice correspondence) signal and the corresponding absolute time information of the signal.Pulse signal is by time service and the amplification of data storage cell
With as trigger signal, institute's time synchronizing on-board equipment in need is sent to by private cable after branch process.Definitely
Temporal information is then sent to correlation time synchronizer by bus.Related subsystem with the pps pulse per second signal for receiving be total system
Time service starting point, completes high accuracy time service or synchronization.
By taking remote sensing satellite as an example, remote sensing satellite because possessing efficient and continuing the advantage such as detectivity, resource and mapping,
The fields such as environmental monitoring, agricultural water conservancy achieve and are widely applied.As user is to satellite remote sensing date time high, high spatial point
The continuous improvement of resolution demand, Optical remote satellite and microwave remote sensing satellite are proposed to time precision on star and synchronization accuracy
More stringent requirement.By taking SAR remote sensing satellites as an example, during high-resolution beam bunching mode works, in order to obtain abundant essence
Thin target information, the satellite of high-speed motion is irradiated the specific imaging region that satellite is prestored by small range all the time, and this is just
It is required that beam bunching mode working time starting point set in advance and Time transfer receiver moment stringent synchronization on star, slightly differentiated time mistake
Difference can cause very important imaging performance to decline.
A kind of entitled clock synchronization systems based on GPS/BD bimodulus time services of Chinese patent CN201410623668.1 and
Method, the system includes the GPS/BD dual mode receivers with antenna, the pulse per second (PPS) of the GPS/BD dual mode receivers with antenna
G1pps output ends and pulse per second (PPS) B1pps output ends are extracted with moment order and are connected with module is confirmed, realize pulse per second (PPS) synchronization,
But it is not related to the acquisition methods of pulse per second (PPS) synchronization accuracy.A kind of entitled inspections GPS pairs of Chinese patent CN201310734350.6
When accuracy systems and method, including：GPS receiver unit, system clock, control unit and processing unit, GPS receiver unit are produced
Benchmark pulse per second (PPS) simultaneously sends to processing unit and obtains gps time and gps system clock is sent into system clock, system clock
When receiving gps time completion pair, control unit monitoring system clock millisecond position sends system pulse per second (PPS) extremely when being more than predetermined threshold value
Processing unit, processing unit is used to generate benchmark pulse per second (PPS) rising edge and system pulse per second (PPS) rising edge, and calculating benchmark pulse per second (PPS)
The time difference of rising edge and system pulse per second (PPS) rising edge, precision when can draw GPS pairs by calculating the time difference, the method is
System calibration method, test of the pulse per second (PPS) using terminal to the synchronization accuracy of pulse per second (PPS) is not related to.Chinese patent
A kind of entitled satellite time synchronization systems of CN201210390636.2, including time transmitting portion, time tranfer part and when
Between receiving portion.Wherein, time transmitting portion is received by GNSS navigation signals, produces accurate UTC time, concurrently
Go out the pulse per second (PPS) corresponding with UTC whole moment second.When time tranfer part is by pulse per second (PPS) and the UTC corresponding with pulse per second (PPS) whole seconds
Carve information transfer to time receiving portion.Time receiving portion receives pulse per second (PPS) and the UTC corresponding with pulse per second (PPS) whole moment second
Information, is triggered by pulse per second (PPS), is counted by local clock, so as to obtain accurate current time.Using the invention
The satellite high-precision clock synchronization system of proposition, can be such that each measuring apparatus of satellite are operated on same time reference, when still
It is not related to the acquisition methods of the synchronization accuracy between measuring apparatus and GNSS navigation signals.
The content of the invention
Technology solve problem of the invention is：Overcome the deficiencies in the prior art, there is provided a kind of space flight based on pulse per second (PPS)
Device synchronization accuracy test system and method, for Space Vehicle System, solve the test problem of pulse per second (PPS) synchronization accuracy, realize navigation
The high precision measurement of the time synchronized of receiver and pulse per second (PPS) using terminal.
Technical solution of the invention is：
A kind of spacecraft synchronization accuracy test system based on pulse per second (PPS), including：Navigation neceiver emulator, navigation are received
Machine, spaceborne time management facility, pulse per second (PPS) using terminal, logic analyser, surface power supply power supply, terminal ground checkout equipment,
Navigation neceiver prosecutor equipment, test client computer；
Navigation neceiver emulator realizes the transmitting of navigation signal and propagates simulation, for navigation neceiver provides information source,
Navigation neceiver is processed the signal of navigation neceiver emulator, obtains whole second timing code and hardware pulse per second (PPS)
Signal, whole second timing code is distributed to pulse per second (PPS) using terminal by spaceborne time management facility, and hardware pps pulse per second signal is supplied to
Pulse per second (PPS) using terminal, as the synchronizing signal of pulse per second (PPS) using terminal；When pulse per second (PPS) using terminal receives the whole second simultaneously
Between code and the hardware pps pulse per second signal, realize high accuracy time service, generation controlling cycle pulse is simultaneously supplied to logic analyser,
Logic analyser compares the hardware pps pulse per second signal that the controlling cycle pulse is provided with navigation neceiver, completes space flight
The test of device synchronization accuracy；
Surface power supply power supply is powered to navigation neceiver emulator, navigation neceiver, spaceborne time management facility；Terminal ground
Face test equipment realizes the working condition detection to pulse per second (PPS) using terminal, and navigation neceiver prosecutor equipment is realized receiving navigation
The Function detection of machine, test client computer realizes the control to spaceborne time management facility.
Spaceborne time management facility is house keeping computer or CPU.
The logic analyser carries out the hardware pps pulse per second signal that the controlling cycle pulse is provided with navigation neceiver
Compare, specially：
Pulse per second (PPS) synchronization accuracy τ is：τ=μ-δ；
Wherein, δ is the logic analyser first controlling cycle pulse time t1 for receiving and the hard of reception transmission that navigate
The difference of part pulse per second (PPS) moment t0；
The microsecond position of first controlling cycle pulse that μ is received for logic analyser.
The pulse per second (PPS) using terminal is optical camera or SAR load.
The signal of the navigation neceiver emulator simulation gps satellite, Beidou navigation satellite or Galileo navigation satellite.
A kind of spacecraft synchronization accuracy method of testing, step is as follows：
(1) cable connection state in accuracy test system is checked, confirms that connection status is normal；
(2) check whether telemetry form is consistent with what communication protocol specified by testing client computer；
(3) navigation neceiver emulator power output is adjusted, navigation neceiver is normally locked, complete positioning；
(4) wait 10 minutes, after confirming that navigation neceiver completes the whole second function of adjustment, export accurate hardware pulse per second (PPS) letter
Number；
(5) logic analyser is compared the hardware pps pulse per second signal that the controlling cycle pulse is provided with navigation neceiver
It is right, complete the test of this spacecraft synchronization accuracy；
(6) repeat step (5), continuous statistics 10 times, assembly average is used as final pulse per second (PPS) synchronization accuracy.
The hardware pulse per second (PPS) letter that step (5) logic analyser provides the controlling cycle pulse and navigation neceiver
Number compare, specially：
Pulse per second (PPS) synchronization accuracy τ is：τ=μ-δ；
Wherein, δ is the logic analyser first controlling cycle pulse time t1 for receiving and the hard of reception transmission that navigate
The difference of part pulse per second (PPS) moment t0, the microsecond position of first controlling cycle pulse that μ is received for logic analyser.
Compared with the prior art, the invention has the advantages that：
Synchronization accuracy test system employs the telemetered signal of pulse per second (PPS) using terminal record, being capable of quick obtaining control week
The actual parameter value of phase pulse, the output valve of the hardware pulse per second (PPS) read by logic analyser, realizes pulse per second (PPS) synchronization accuracy
Calculating and test, the simple system reliability of structure, synchronization accuracy method of testing is convenient and swift.
Brief description of the drawings
Fig. 1 is spacecraft synchronization accuracy test system implementation figure of the present invention based on pulse per second (PPS)；
Fig. 2 is spacecraft synchronization accuracy method of testing schematic diagram of the present invention；
Specific embodiment
Specific embodiment of the invention is further described in detail below in conjunction with the accompanying drawings.
As shown in figure 1, the spacecraft synchronization accuracy test system based on pulse per second (PPS) proposed by the present invention, including：Navigation connects
Receipts machine emulator, navigation neceiver, spaceborne time management facility, pulse per second (PPS) using terminal, logic analyser, surface power supply electricity
Source, terminal ground checkout equipment, navigation neceiver prosecutor equipment, test client computer；
Navigation neceiver emulator realizes the transmitting of navigation signal and propagates simulation, for navigation neceiver provides information source,
Navigation neceiver is processed the signal of navigation neceiver emulator, obtains whole second timing code and hardware pulse per second (PPS)
Signal, whole second timing code is distributed to pulse per second (PPS) using terminal by spaceborne time management facility, and hardware pps pulse per second signal is supplied to
Pulse per second (PPS) using terminal, as the synchronizing signal of pulse per second (PPS) using terminal；When pulse per second (PPS) using terminal receives the whole second simultaneously
Between code and the hardware pps pulse per second signal, realize high accuracy time service, generation controlling cycle pulse is simultaneously supplied to logic analyser,
Logic analyser compares the hardware pps pulse per second signal that the controlling cycle pulse is provided with navigation neceiver, completes space flight
The test of device synchronization accuracy；
Surface power supply power supply is powered to navigation neceiver emulator, navigation neceiver, spaceborne time management facility；Terminal ground
Face test equipment realizes the working condition detection to pulse per second (PPS) using terminal, and navigation neceiver prosecutor equipment is realized receiving navigation
The Function detection of machine, test client computer realizes the control to spaceborne time management facility.
Spaceborne time management facility is house keeping computer or CPU.
The logic analyser carries out the hardware pps pulse per second signal that the controlling cycle pulse is provided with navigation neceiver
Compare, specially：
Pulse per second (PPS) synchronization accuracy τ is：τ=μ-δ；
Wherein, δ is the logic analyser first controlling cycle pulse time t1 for receiving and the hard of reception transmission that navigate
The difference of part pulse per second (PPS) moment t0；
The microsecond position of first controlling cycle pulse that μ is received for logic analyser.
The pulse per second (PPS) using terminal is optical camera or SAR load.Navigation neceiver emulator simulation gps satellite,
The signal of Beidou navigation satellite or Galileo navigation satellite.
As shown in Fig. 2 the invention allows for a kind of based on the same of described spacecraft synchronization accuracy test system realization
Step method for testing precision, step is as follows：
(1) cable connection state in accuracy test system is checked, confirms that connection status is normal；
The inspection purpose of the step is the particularly cable in order to the connection status to synchronization accuracy test system confirms
The Correctness checking of connection, impedance matching inspection etc..
(2) check whether telemetry form is consistent with what communication protocol specified by testing client computer；
The inspection purpose of the step is in order that test system is true with satellite in communication mode and information interaction approach
In-orbit state is consistent, it is ensured that the communication protocol for using uses communication protocol identical with satellite, so just can ensure that pulse per second (PPS)
Timing code is identical with satellitosis on the transmit path.
(3) navigation neceiver emulator power output is adjusted, navigation neceiver is normally locked, complete positioning；
The purpose that the step is implemented is, in order to ensure navigation neceiver is in normal operating conditions, to simulate navigation neceiver
The true in-orbit state that the signal of nautical star is received and locked.
(4) wait 10 minutes, after confirming that navigation neceiver completes the whole second function of adjustment, export accurate hardware pulse per second (PPS) letter
Number；
The purpose that the step is implemented is in order to ensure the hardware pulse per second (PPS) of navigation reception output is effective.
(5) logic analyser is compared the hardware pps pulse per second signal that the controlling cycle pulse is provided with navigation neceiver
It is right, complete the test of this spacecraft synchronization accuracy；
Specially：
Pulse per second (PPS) synchronization accuracy τ is：τ=μ-δ；
Wherein, δ is the logic analyser first controlling cycle pulse time t1 for receiving and the hard of reception transmission that navigate
The difference of part pulse per second (PPS) moment t0, the microsecond position of first controlling cycle pulse that μ is received for logic analyser；
(6) repeat step (5), continuous statistics 10 times, assembly average is used as final pulse per second (PPS) synchronization accuracy.
The purpose that the step is implemented is in order to the method using assembly average can more effectively illustrate test result
Confidence level, proposes the influence that indivedual outlier are caused.
Embodiment：
Illustrated by taking the loading device of synthetic aperture radar SAR satellites as an example：
1st, on star and ground installation cable connection state, self-inspection state confirmation.
2nd, confirm on navigation neceiver star and ground installation cable connection state, self-inspection state confirmation.
3rd, confirm that SAR supervision timers (pulse per second (PPS) using terminal) and ground installation cable connection state, self-inspection state are true
Recognize.
4th, participate in the experiment subsystem, interconnecting device, logic analyser interconnection state are confirmed.
5th, check whether telemetry data form is consistent with what communication protocol specified by testing client computer.
6th, navigation neceiver emulator power output is adjusted, receiver is normally locked, complete positioning function.
7th, wait 10 minutes, after confirming that navigation neceiver completes adjustment second function, export accurate hardware pps pulse per second signal.
8th, recorded using logic analyser and calculate first controlling cycle pulse and the time difference at pulse per second (PPS) moment, should
Controlling cycle burst length and pulse per second (PPS) moment are from the direct-recording time value of logic analyser.
9th, the microsecond position μ=232.6 μ s of first controlling cycle pulse is recorded by biography under remote measurement.
10th, the time delay of SAR supervision timers treatment pulse per second (PPS) link be first controlling cycle pulse microsecond position μ=
232.6 μ s, the difference τ=2.2 μ s with δ=230.4 μ s.
11st, continuous statistics 10 times, used as final pulse per second (PPS) synchronization accuracy, precision is statistics delay data average value
1.608μs。
12nd, each test equipment units shutdown.
Above-described embodiment uses method of testing proposed by the present invention, the reality of quick obtaining SAR load controlling cycle pulses
Parameter value, the output valve of the hardware pulse per second (PPS) read by logic analyser, realizes the calculating of SAR load pulse per second (PPS) synchronization accuracies
With test, the simple system reliability of structure, synchronization accuracy method of testing is convenient and swift.
Unspecified part of the present invention belongs to general knowledge as well known to those skilled in the art.
Claims (7)
1. a kind of spacecraft synchronization accuracy test system based on pulse per second (PPS), it is characterised in that including：Navigation neceiver emulator,
Navigation neceiver, spaceborne time management facility, pulse per second (PPS) using terminal, logic analyser, surface power supply power supply, terminal ground are surveyed
Examination equipment, navigation neceiver prosecutor equipment, test client computer；
Navigation neceiver emulator realizes the transmitting of navigation signal and propagates simulation, for navigation neceiver provides information source,
Navigation neceiver is processed the signal of navigation neceiver emulator, obtains whole second timing code and hardware pulse per second (PPS) letter
Number, whole second timing code is distributed to pulse per second (PPS) using terminal by spaceborne time management facility, and hardware pps pulse per second signal is supplied to the second
Pulse using terminal, as the synchronizing signal of pulse per second (PPS) using terminal；Pulse per second (PPS) using terminal receives whole time second simultaneously
Code and the hardware pps pulse per second signal, realize high accuracy time service, generate controlling cycle pulse and are supplied to logic analyser, patrol
Collect analyzer the hardware pps pulse per second signal that the controlling cycle pulse is provided with navigation neceiver is compared, complete spacecraft
The test of synchronization accuracy；
Surface power supply power supply is powered to navigation neceiver emulator, navigation neceiver, spaceborne time management facility；Terminal ground is surveyed
Examination equipment realizes the working condition detection to pulse per second (PPS) using terminal, and navigation neceiver prosecutor equipment is realized to navigation neceiver
Function detection, test client computer realizes the control to spaceborne time management facility.
2. a kind of spacecraft synchronization accuracy test system based on pulse per second (PPS) according to claim 1, it is characterised in that：Star
It is house keeping computer or CPU to carry time management facility.
3. a kind of spacecraft synchronization accuracy test system based on pulse per second (PPS) according to claim 1, it is characterised in that：Institute
State logic analyser the hardware pps pulse per second signal that the controlling cycle pulse is provided with navigation neceiver is compared, specifically
For：
Pulse per second (PPS) synchronization accuracy τ is：τ=μ-δ；
Wherein, δ is the logic analyser first controlling cycle pulse time t1 for receiving and the hardware second for navigating reception transmission
The difference of pulse time t0；
The microsecond position of first controlling cycle pulse that μ is received for logic analyser.
4. a kind of spacecraft synchronization accuracy test system based on pulse per second (PPS) according to claim 1, it is characterised in that：Institute
Pulse per second (PPS) using terminal is stated for optical camera or SAR load.
5. a kind of spacecraft synchronization accuracy test system based on pulse per second (PPS) according to claim 1, it is characterised in that：Institute
State the signal of navigation neceiver emulator simulation gps satellite, Beidou navigation satellite or Galileo navigation satellite.
6. the synchronization accuracy method of testing that a kind of spacecraft synchronization accuracy test system based on described in claim 1 is realized, its
It is characterised by that step is as follows：
(1) cable connection state in accuracy test system is checked, confirms that connection status is normal；
(2) check whether telemetry form is consistent with what communication protocol specified by testing client computer；
(3) navigation neceiver emulator power output is adjusted, navigation neceiver is normally locked, complete positioning；
(4) wait 10 minutes, after confirming that navigation neceiver completes the whole second function of adjustment, export accurate hardware pps pulse per second signal；
(5) logic analyser compares the hardware pps pulse per second signal that the controlling cycle pulse is provided with navigation neceiver,
Complete the test of this spacecraft synchronization accuracy；
(6) repeat step (5), continuous statistics 10 times, assembly average is used as final pulse per second (PPS) synchronization accuracy.
7. a kind of spacecraft synchronization accuracy method of testing according to claim 6, it is characterised in that：The step (5) is patrolled
Collect analyzer the hardware pps pulse per second signal that the controlling cycle pulse is provided with navigation neceiver is compared, specially：
Pulse per second (PPS) synchronization accuracy τ is：τ=μ-δ；
Wherein, δ is the logic analyser first controlling cycle pulse time t1 for receiving and the hardware second for navigating reception transmission
The difference of pulse time t0, the microsecond position of first controlling cycle pulse that μ is received for logic analyser.
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Cited By (13)
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| CN108124086A (en) * | 2017-12-06 | 2018-06-05 | 北京空间机电研究所 | A kind of spaceborne video electronics system based on digitlization focal plane |
| CN108844544A (en) * | 2018-06-11 | 2018-11-20 | 北京航天自动控制研究所 | A kind of main and sub navigation device synchronizing information design method |
| CN109001971A (en) * | 2018-07-25 | 2018-12-14 | 中国科学院国家空间科学中心 | A kind of certainly punctual system and method for the spaceborne interference imaging altimeter based on FPGA |
| CN109633700A (en) * | 2018-12-03 | 2019-04-16 | 天津津航计算技术研究所 | A kind of more GPS receiver time service precision test methods |
| CN109714125A (en) * | 2019-01-08 | 2019-05-03 | 上海卫星工程研究所 | Wireless time synchronous method, system and satellite between satellite capsule |
| CN111082917A (en) * | 2019-11-26 | 2020-04-28 | 北京空间机电研究所 | Accurate time keeping method of integration time based on pulse per second |
| CN111756593A (en) * | 2019-03-28 | 2020-10-09 | 北京米文动力科技有限公司 | Self-testing method and testing method for synchronization precision of time synchronization system |
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| CN112710945A (en) * | 2020-12-07 | 2021-04-27 | 航天恒星科技有限公司 | Universal time calibration test equipment and method |
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| CN113824522A (en) * | 2021-09-18 | 2021-12-21 | 上海航天电子通讯设备研究所 | Time correcting system based on VDE satellite-ship synchronous communication system |
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| CN108124086A (en) * | 2017-12-06 | 2018-06-05 | 北京空间机电研究所 | A kind of spaceborne video electronics system based on digitlization focal plane |
| CN108124086B (en) * | 2017-12-06 | 2020-06-09 | 北京空间机电研究所 | Satellite-borne video electronics system based on digital focal plane |
| CN108844544B (en) * | 2018-06-11 | 2020-09-18 | 北京航天自动控制研究所 | Information synchronism design method for main and sub navigation devices |
| CN108844544A (en) * | 2018-06-11 | 2018-11-20 | 北京航天自动控制研究所 | A kind of main and sub navigation device synchronizing information design method |
| CN109001971A (en) * | 2018-07-25 | 2018-12-14 | 中国科学院国家空间科学中心 | A kind of certainly punctual system and method for the spaceborne interference imaging altimeter based on FPGA |
| CN109001971B (en) * | 2018-07-25 | 2019-09-06 | 中国科学院国家空间科学中心 | A kind of certainly punctual system and method for the spaceborne interference imaging altimeter based on FPGA |
| CN109633700A (en) * | 2018-12-03 | 2019-04-16 | 天津津航计算技术研究所 | A kind of more GPS receiver time service precision test methods |
| CN109633700B (en) * | 2018-12-03 | 2022-11-22 | 天津津航计算技术研究所 | Method for testing time service precision of multiple GPS receivers |
| CN109714125B (en) * | 2019-01-08 | 2021-04-27 | 上海卫星工程研究所 | Method and system for synchronizing wireless time between satellite cabins and satellite |
| CN109714125A (en) * | 2019-01-08 | 2019-05-03 | 上海卫星工程研究所 | Wireless time synchronous method, system and satellite between satellite capsule |
| CN111756593A (en) * | 2019-03-28 | 2020-10-09 | 北京米文动力科技有限公司 | Self-testing method and testing method for synchronization precision of time synchronization system |
| CN111082917A (en) * | 2019-11-26 | 2020-04-28 | 北京空间机电研究所 | Accurate time keeping method of integration time based on pulse per second |
| CN111082917B (en) * | 2019-11-26 | 2022-04-12 | 北京空间机电研究所 | Accurate time keeping method of integration time based on pulse per second |
| CN112305575A (en) * | 2020-09-25 | 2021-02-02 | 北京空间飞行器总体设计部 | High-orbit SAR satellite precise orbit determination system |
| CN112305575B (en) * | 2020-09-25 | 2024-04-02 | 北京空间飞行器总体设计部 | Precise orbit determination system for high orbit SAR satellite |
| CN112305568A (en) * | 2020-09-30 | 2021-02-02 | 北京空间飞行器总体设计部 | Method for testing consistency of ranging result of spacecraft and ranging reference change |
| CN112305568B (en) * | 2020-09-30 | 2023-08-29 | 北京空间飞行器总体设计部 | Method for testing consistency of ranging result and ranging reference change of spacecraft |
| CN113498625A (en) * | 2020-10-13 | 2021-10-12 | 深圳市大疆创新科技有限公司 | Clock synchronization method and device, chip system, unmanned aerial vehicle and terminal |
| CN112710945A (en) * | 2020-12-07 | 2021-04-27 | 航天恒星科技有限公司 | Universal time calibration test equipment and method |
| CN112710945B (en) * | 2020-12-07 | 2022-09-27 | 航天恒星科技有限公司 | Universal timing test device and method |
| CN113824522A (en) * | 2021-09-18 | 2021-12-21 | 上海航天电子通讯设备研究所 | Time correcting system based on VDE satellite-ship synchronous communication system |
| CN113824522B (en) * | 2021-09-18 | 2023-09-12 | 上海航天电子通讯设备研究所 | Timing system based on VDE star-ship synchronous communication system |
| CN116896516A (en) * | 2023-08-09 | 2023-10-17 | 上海怿星电子科技有限公司 | Time synchronization precision testing system and method based on pulse per second method |
| CN116896516B (en) * | 2023-08-09 | 2024-05-31 | 上海怿星电子科技有限公司 | Time synchronization precision testing system and method based on pulse per second method |
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