CN103197535A - Method for satellite-ground timing with oscilloscope - Google Patents
Method for satellite-ground timing with oscilloscope Download PDFInfo
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- CN103197535A CN103197535A CN2013101275079A CN201310127507A CN103197535A CN 103197535 A CN103197535 A CN 103197535A CN 2013101275079 A CN2013101275079 A CN 2013101275079A CN 201310127507 A CN201310127507 A CN 201310127507A CN 103197535 A CN103197535 A CN 103197535A
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Abstract
The invention provides a method for satellite-ground timing with an oscilloscope. According to the method, the oscilloscope is used for carrying out a ground experiment to obtain satellite-ground time delay delta T satellite-ground time delay, accurate satellite-ground time difference is then calculated, and satellite timing is then carried out according to the measured satellite-ground time difference to enable an on-satellite data management clock to be synchronous with a ground clock.
Description
Technical field
The present invention relates to the space exploration technical field, relate in particular to a kind of method when utilizing oscillograph to carry out school, star ground.
Background technology
China Satecom's engineering concentrates strength on developing artificial satellite then from the starting of development sounding rocket, emphasis development types of applications satellite; During the ninth five-year plan, China development and engineering management work have had large increase, develop altogether and have launched 11 dissimilar artificial satellites and first Shenzhou (Divine Vessel) tested airship; After this, China has launched goddess in the moon's series satellite again, makes the aerospace industry of China be a a progressive step;
But in the reality, number pipe clock and ground clock can't keep synchronously on the star, in the time of therefore need carrying out the school to satellite; Calibration method is general to be adopted when concentrating the school, refer to when concentrating the school particular moment to star on the time adjust, consistent when making it the ground with current time.Concrete operation method is T when at first recording on the star
StarT during with ground
GroundBetween difference DELTA T
The star ground time difference=T
Ground-T
Star, adjust Δ T when injecting star by upstream data afterwards
Star ground The time difference, be T' during star after make adjusting
Star=T
Star+ Δ T
The star ground time difference=T
Ground, process when finishing the school; In practical operation, because the existence of systematic error causes Δ T
The star ground time differenceData inaccurate, and then the purpose when not reaching accurate school; Make a concrete analysis of below in conjunction with the systematic error of Fig. 1:
Number pipe computing machine on the star is obtained time t on the star when generating descending telemetry frame synchronous head EB90 (H) the 1st bit forward position
Star, with this time encoding (being to beat markers on the star) in current telemetry frame, and be sent to ground by the observing and controlling downlink; The ground observing and controlling baseband equipment is after demodulating the telemetry frame synchronous head, at the current ground elapsed time t of synchronous head the 1st bit forward position record
Ground(being that markers is beaten on ground), and should the time mail to the ground master control with the telemetry that demodulates.Master control parses the t in every frame telemetry
StarAnd t
Ground, calculate Δ t=t
Ground-t
Star, through obtaining star ground time difference Δ T after the data processing
The star ground time difference, annotate on the star by up the going up of observing and controlling at last.
Measured value Δ t consists of the following components: star ground time difference Δ T
The star ground time difference, on-board equipment time delay Δ T
Star, uphole equipment time delay Δ T
Ground, observing and controlling downlink transmission time delay Δ T
Transmission, namely
Δ t=Δ T
The star ground time difference+ Δ T
Star+ Δ T
Ground+ Δ T
Transmission
Δ T
StarCaused by processes such as number pipe framing, chnnel coding, PSK modulation on the star.Δ T
GroundCaused by processes such as the solution of the baseband equipment PSK in ground receiving equipment mediation channel-decodings.Δ T
TransmissionCaused by the descending long cable of observing and controlling that connects satellite and ground in the general assembly electrical measurement stage, can calculate by cable length, also can utilize uphole equipment accurately to measure, can calculate with the light velocity by distance after the satellite Heaven.Above factor is measures the systematic error of star ground during the time difference, and master control just can obtain the star ground time difference accurately after Δ t deducts the said system error as a result with original measurement.
In the said system error, Δ T
TransmissionCan calculate or directly measure by theoretical.Δ T
StarWith Δ T
GroundIndependent measurement is had any problem, and generally measures when number pipe and integration test joint-trial, obtains sum of the two Δ T
Star ground time delay=Δ T
Star+ Δ T
Ground, be referred to as star ground time delay.As can be seen, star ground time delay is the important parameter of satellite when concentrating the school, the accuracy when directly having influenced concentrated school; Therefore the invention provides a kind of method when utilizing oscillograph to carry out school, star ground;
Summary of the invention
The invention provides a kind of method when utilizing oscillograph to carry out school, star ground, utilize oscillograph to carry out ground experiment and obtain star ground time delay Δ T
Star ground time delay, calculate the accurate star ground time difference again, when carrying out the satellite school according to the star ground time difference that measures, make on the star number pipe clocks and ground clock keep synchronous.
The objective of the invention is to be achieved through the following technical solutions:
Step 1: the number pipe computing machine on the star is obtained time t on the star at that time when generating descending telemetry frame synchronous head EB90 (H) the 1st bit forward position
Star, with this time encoding in current telemetry frame;
Step 2: the telemetry frame that contains time encoding in the step 1 is carried out pulse code, be modulated into pcm stream, further convert described pcm stream to psk signal through sub-carrier modulation;
Step 3: the psk signal that step 2 is obtained sends to the observing and controlling baseband equipment by the video cable telemetering channel;
Step 4: the observing and controlling baseband equipment carries out the subcarrier demodulation to the psk signal that receives and obtains the PCM signal, demodulate the telemetry frame synchronous head after, at the current ground elapsed time t of telemetry frame synchronous head the 1st bit forward position record
Ground, and should ground elapsed time t
GroundMail to total control computer with the telemetry that demodulates;
Step 5: total control computer at first parses time t on the star at that time in every frame telemetry
StarWith current ground elapsed time t
Ground, obtain the difference DELTA t of time and ground elapsed time on the star, Δ t=t
Ground-t
StarThen according to formula Δ T
The star ground time difference=Δ t-Δ T
Star ground time delay-Δ T
TransmissionCalculate star ground time difference Δ T
The star ground time difference
Δ T wherein
TransmissionCalculate or directly measure and learn by theory; Δ T
Star ground time delayDraw by ground experiment, the on-board equipment, the uphole equipment that adopt are real equipment, and on-board equipment links to each other by cable with uphole equipment, and cable length used in the experiment is all in 3 meters, the measuring error that is caused by the cable time delay is ignored at nanosecond order; Ground experiment comprises step 1 to step 4, and the step of increase is:
1) telemetry frame after the step 1 time encoding is exported a number pipe frame-synchronizing impulse through the pulse generator and give oscillograph, telemetry frame synchronous head EB90 (H) the 1st bit forward position in the forward position alignment procedures one of this number pipe frame-synchronizing impulse;
2) the PCM signal that the step 4 demodulation is obtained sends to oscillograph, and this PCM signal has telemetry frame synchronous head EB90 (H);
3) oscillograph receives number pipe frame-synchronizing impulses and the steps 2 of step 1)) demodulation after the PCM signal compare: obtain the mistiming in telemetry frame synchronous head EB90 (H) the 1st bit forward position of the PCM signal after number pipe frame-synchronizing impulse forward positions and the demodulation, this mistiming is star ground time delay Δ T
Star ground time delayWith star ground time delay Δ T
Star ground time delaySend to total control computer;
Step 6: with star ground time difference Δ T
The star ground time differenceSend on the star by the observing and controlling up-link, adjust the time on the star for clock on the star.
Current ground elapsed time t in the step 4
GroundThe system source provides time reference during by GPS.
Current ground elapsed time t
GroundWhen mailing to total control computer with the telemetry that demodulates, adopt the mode of remote measurement true add ground elapsed time sign.
Beneficial effect of the present invention:
This measuring method has overcome systematic error, and then accurately obtains the star ground time difference, when carrying out the satellite school according to star ground time difference of measuring then, makes on the star number pipe clock synchronous with the maintenance of ground clock.
Description of drawings
Fig. 1 is the prior art synoptic diagram;
Fig. 2 is instrumentation plan of the present invention;
Fig. 3 is uphole equipment time system principle schematic;
Fig. 4 is star ground latency measurement principle schematic;
Fig. 5 is star ground latency measurement block diagram;
Embodiment
In order to understand technical scheme of the present invention better, below in conjunction with drawings and the specific embodiments the present invention is done to describe in further detail.
The invention provides a kind of method when utilizing oscillograph to carry out school, star ground, can overcome systematic error according to this measuring method, and then accurately obtain the star ground time difference, when carrying out the satellite school according to the star ground time difference that measures then, make on the star number pipe clock synchronous with the maintenance of ground clock.
At first make a concrete analysis of according to Fig. 2 below:
Concrete steps of the present invention are:
Step 1: the number pipe computing machine on the star is obtained time t on the star at that time when generating descending telemetry frame synchronous head EB90 (H) the 1st bit forward position
Star, with this time encoding in current telemetry frame;
Step 2: the telemetry frame that contains time encoding in the step 1 is carried out pulse code, be modulated into pcm stream, further convert described pcm stream to psk signal through sub-carrier modulation;
Step 3: the psk signal that step 2 is obtained sends to the observing and controlling baseband equipment by the video cable telemetering channel;
Step 4: the observing and controlling baseband equipment carries out the subcarrier demodulation to the psk signal that receives and obtains the PCM signal, demodulate the telemetry frame synchronous head after, at the current ground elapsed time t of telemetry frame synchronous head the 1st bit forward position record
Ground, and should ground elapsed time t
GroundMail to total control computer with the telemetry that demodulates;
Time t wherein
GroundWhen mailing to total control computer with the telemetry that demodulates, adopt the mode of remote measurement true add ground elapsed time sign; Ground elapsed time t is provided
GroundThe ground clock calibrate in the system source during by GPS, as shown in Figure 3, the system source receives gps satellite signal by gps antenna during GPS, through resolving back output time signal.The system source provides two kinds of time service interfaces during GPS, and wherein hardware time service interfaces special is observing and controlling baseband equipment CORTEX time service, is used for CORTEX and beats markers for the telemetry frame that receives.Hardware interface comprises 3 road signals: IRIG-B coded signal, 10MHz frequency reference, 1-PPS pulse signal.Having under the 1-PPS pulse situation, CORTEX markers precision is ± 10us; Do not have under the pulse per second (PPS) situation, the markers precision is ± 50us.Software interface provides NTP time service service by network interface, and master control and each subsystem uphole equipment can obtain temporal information by NTP Client, and time service precision is in the millisecond magnitude.
Step 5: total control computer at first parses time t on the star at that time in every frame telemetry
StarWith current ground elapsed time t
Ground, obtain the difference DELTA t of time and ground elapsed time on the star, Δ t=t
Ground-t
StarThen according to formula Δ T
The star ground time difference=Δ t-Δ T
Star ground time delay-Δ T
TransmissionCalculate star ground time difference Δ T
The star ground time difference
Δ T wherein
TransmissionCalculate or directly measure and learn by theory; Δ T
Star ground time delayDraw by ground experiment, the on-board equipment, the uphole equipment that adopt are real equipment, and on-board equipment links to each other by cable with uphole equipment, and cable length used in the experiment is all in 3 meters, the measuring error that is caused by the cable time delay is ignored at nanosecond order; Ground experiment comprises step 1 to step 4, and the step of increase is:
1) telemetry frame after the step 1 time encoding is exported a number pipe frame-synchronizing impulse through the pulse generator and give oscillograph, telemetry frame synchronous head EB90 (H) the 1st bit forward position in the forward position alignment procedures one of this number pipe frame-synchronizing impulse;
2) the PCM signal that the step 4 demodulation is obtained sends to oscillograph, and this PCM signal has telemetry frame synchronous head EB90 (H);
3) oscillograph receives number pipe frame-synchronizing impulses and the steps 2 of step 1)) demodulation after the PCM signal compare: obtain the mistiming in telemetry frame synchronous head EB90 (H) the 1st bit forward position of the PCM signal after number pipe frame-synchronizing impulse forward positions and the demodulation, this mistiming is star ground time delay Δ T
Star ground time delayWith star ground time delay Δ T
Star ground time delaySend to total control computer;
As Fig. 4, number pipe computing machine is exported a negative pulse in delta frame synchronous head EB90 (H), and EB90 (H) the 1st bit forward position is aimed in its forward position.Use the psk signal of uphole equipment logarithm pipe output to carry out demodulation, CORTEX can externally export the PCM signal waveform after finishing PSK solution mediation channel-decoding.PCM signal waveform with oscillograph observed number pipe frame-synchronizing impulse and ground demodulation, compare the mistiming between the two paths of signals forward position, can obtain star ground time delay, as Fig. 3, belong to the desktop joint-trial in the experiment, used cable length is all in 3 meters in the experiment, and the measuring error that is caused by the cable time delay can be ignored at nanosecond order.
Problem and solution that star ground latency measurement runs into because CORTEX equipment (CORTEX2 among Fig. 5) the telemetry demodulation module of using does not possess the function of output PCM signal at present, so can't directly be carried out star ground latency measurement.For addressing this problem, the CORTEX1 among used that model in the past uses one CORTEX(Fig. 4 that can export remote measurement PCM waveform).During experiment, the system source is with the time synchronized of two CORTEX when at first using GPS, and two CORTEX while receiving demodulations are counted the remote measurement psk signal of pipe output, the star ground time delay Δ T of measure CO RTEX1 according to the method described above afterwards
1 star ground time delay, the difference Δ T of the markers of beating during the same frame remote measurement of two CORTEX demodulation relatively afterwards
12 markers, calculate Δ T
1 star ground time delay-Δ T
12 markersStar ground time delay Δ T when just being to use CORTEX2
2 star ground time delays
This experiment actual measured results is as follows:
Step 6: with star ground time difference Δ T
The star ground time differenceSend on the star by the observing and controlling up-link, adjust the time on the star for clock on the star.
In sum, more than be preferred embodiment of the present invention only, be not for limiting protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. the method when utilizing oscillograph to carry out school, star ground is characterized in that,
Step 1: the number pipe computing machine on the star is obtained time t on the star at that time when generating descending telemetry frame synchronous head EB90 (H) the 1st bit forward position
Star, with this time encoding in current telemetry frame;
Step 2: the telemetry frame that contains time encoding in the step 1 is carried out pulse code, be modulated into pcm stream, further convert described pcm stream to psk signal through sub-carrier modulation;
Step 3: the psk signal that step 2 is obtained sends to the observing and controlling baseband equipment by the video cable telemetering channel;
Step 4: the observing and controlling baseband equipment carries out the subcarrier demodulation to the psk signal that receives and obtains the PCM signal, demodulate the telemetry frame synchronous head after, at the current ground elapsed time t of telemetry frame synchronous head the 1st bit forward position record
Ground, and should ground elapsed time t
GroundMail to total control computer with the telemetry that demodulates;
Step 5: total control computer at first parses time t on the star at that time in every frame telemetry
StarWith current ground elapsed time t
Ground, obtain the difference DELTA t of time and ground elapsed time on the star, Δ t=t
Ground-t
StarThen according to formula Δ T
The star ground time difference=Δ t-Δ T
Star ground time delay-Δ T
TransmissionCalculate star ground time difference Δ T
The star ground time difference
Δ T wherein
TransmissionCalculate or directly measure and learn by theory; Δ T
Star ground time delayDraw by ground experiment, the on-board equipment, the uphole equipment that adopt are real equipment, and on-board equipment links to each other by cable with uphole equipment, and cable length used in the experiment is all in 3 meters, the measuring error that is caused by the cable time delay is ignored at nanosecond order; Ground experiment comprises step 1 to step 4, and the step of increase is:
1) telemetry frame after the step 1 time encoding is exported a number pipe frame-synchronizing impulse through the pulse generator and give oscillograph, telemetry frame synchronous head EB90 (H) the 1st bit forward position in the forward position alignment procedures one of this number pipe frame-synchronizing impulse;
2) the PCM signal that the step 4 demodulation is obtained sends to oscillograph, and this PCM signal has telemetry frame synchronous head EB90 (H);
3) oscillograph receives number pipe frame-synchronizing impulses and the steps 2 of step 1)) demodulation after the PCM signal compare: obtain the mistiming in telemetry frame synchronous head EB90 (H) the 1st bit forward position of the PCM signal after number pipe frame-synchronizing impulse forward positions and the demodulation, this mistiming is star ground time delay Δ T
Star ground time delayWith star ground time delay Δ T
Star ground time delaySend to total control computer;
Step 6: with star ground time difference Δ T
The star ground time differenceSend on the star by the observing and controlling up-link, adjust the time on the star for clock on the star.
2. a kind of method when utilizing oscillograph to carry out school, star ground as claimed in claim 1 is characterized in that, current ground elapsed time t in the step 4
GroundThe system source provides time reference during by GPS.
3. a kind of method when utilizing oscillograph to carry out school, star ground as claimed in claim 1 is characterized in that, wherein current ground elapsed time t
GroundWhen mailing to total control computer with the telemetry that demodulates, adopt the mode of remote measurement true add ground elapsed time sign.
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| CN103777517A (en) * | 2013-12-27 | 2014-05-07 | 航天科工深圳（集团）有限公司 | System and method for checking GPS time setting precision |
| CN105068415A (en) * | 2014-12-31 | 2015-11-18 | 中国人民解放军63921部队 | satellite-ground timing method for observation station without condition for compatibility test between ground station and satellite |
| CN105182733A (en) * | 2015-08-07 | 2015-12-23 | 北京利和顺达电子有限公司 | Precision improvement method and system for Beidou time service synchronization |
| CN107329394A (en) * | 2017-05-16 | 2017-11-07 | 上海卫星工程研究所 | High precision star ground time difference measurement method |
| CN109085609A (en) * | 2018-06-28 | 2018-12-25 | 上海卫星工程研究所 | Xing Shang mechanism closed-loop control latency measurement system and method |
| CN111812966A (en) * | 2020-07-02 | 2020-10-23 | 北京航天飞行控制中心 | Multi-spacecraft-based time difference between heaven and earth determining method, determining device and processor |
| CN114943061A (en) * | 2022-06-28 | 2022-08-26 | 北京航天驭星科技有限公司 | Satellite time difference data processing method and system, electronic device and medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103777517A (en) * | 2013-12-27 | 2014-05-07 | 航天科工深圳（集团）有限公司 | System and method for checking GPS time setting precision |
| CN105068415A (en) * | 2014-12-31 | 2015-11-18 | 中国人民解放军63921部队 | satellite-ground timing method for observation station without condition for compatibility test between ground station and satellite |
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| CN107329394A (en) * | 2017-05-16 | 2017-11-07 | 上海卫星工程研究所 | High precision star ground time difference measurement method |
| CN109085609A (en) * | 2018-06-28 | 2018-12-25 | 上海卫星工程研究所 | Xing Shang mechanism closed-loop control latency measurement system and method |
| CN111812966A (en) * | 2020-07-02 | 2020-10-23 | 北京航天飞行控制中心 | Multi-spacecraft-based time difference between heaven and earth determining method, determining device and processor |
| CN111812966B (en) * | 2020-07-02 | 2022-01-28 | 北京航天飞行控制中心 | Multi-spacecraft-based time difference between heaven and earth determining method, determining device and processor |
| CN114943061A (en) * | 2022-06-28 | 2022-08-26 | 北京航天驭星科技有限公司 | Satellite time difference data processing method and system, electronic device and medium |
| CN114943061B (en) * | 2022-06-28 | 2022-10-25 | 北京航天驭星科技有限公司 | Satellite time difference data processing method and system, electronic device and medium |
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