CN111934740A - Relay time delay ground test method based on regenerative forwarding satellite relay mode - Google Patents
Relay time delay ground test method based on regenerative forwarding satellite relay mode Download PDFInfo
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- CN111934740A CN111934740A CN202010635687.1A CN202010635687A CN111934740A CN 111934740 A CN111934740 A CN 111934740A CN 202010635687 A CN202010635687 A CN 202010635687A CN 111934740 A CN111934740 A CN 111934740A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/364—Delay profiles
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention relates to a relay time delay ground test method based on a regenerative forwarding satellite relay mode, belonging to the field of satellite relay link time delay test; step one, establishing a wired relay link; setting the internal delay DeltaT of the detectorDevice for cleaning the skin(ii) a Setting the time delay delta T of the transmission of the radio frequency signal from the detector to the relay satelliteSatellite transmission(ii) a Setting time delay delta T of decoding and encoding of relay satelliteStar (star)(ii) a Setting the time delay delta T of the coded radio frequency signal from the relay satellite to the ground test equipmentSatellite-to-ground transmission(ii) a Calculating the time delay delta T of the whole relay linkSatellite time delay(ii) a Secondly, respectively timing the detector and the relay satellite by taking ground time as a reference; step three, calculating the relay satellite time code tStar (star)And the time code t of the detectorDevice for cleaning the skinThe difference Δ t is tStar (star)‑tDevice for cleaning the skin(ii) a Step four, judging and calculating the relay satellite time code tStar (star)And the time code t of the detectorDevice for cleaning the skinThe time delay delta T of the whole relay link can be obtained by the difference delta TSatellite time delay(ii) a The invention realizes accurate acquisition of the relay time delay required by the task and provides input for on-orbit time calibration, working program design and the like.
Description
Technical Field
The invention belongs to the field of satellite relay link time delay testing, and relates to a relay time delay ground testing method based on a regenerative forwarding satellite relay mode.
Background
The relay forwarding of the satellite generally includes a regenerative forwarding system and a transparent forwarding system. The transparent forwarding system is to amplify and convert the received signal, not to process it, but to simply complete the forwarding task; the regenerative forwarding system is to pre-amplify the received signal, convert the signal into an intermediate frequency signal by down-conversion, demodulate and decode the signal, process the obtained baseband signal, send the processed baseband signal to a large-capacity solid-state storage unit for storage, or transmit the processed baseband signal after encoding, modulation and amplification.
The transparent forwarding relay system is relatively simple and has good inheritance, but is not suitable for long-distance multi-user communication and is widely applied to earth orbit relay communication tasks at present. The advantages of the regenerative forwarding system are firstly embodied in that channel coding can be adopted to obtain coding gain to make up for the insufficient power of a radio frequency link caused by a long distance; secondly, when a plurality of users are relayed simultaneously, the number of the radio frequency devices of the relay system can be greatly reduced by adopting a data regeneration forwarding system, and the weight and the volume of the relay satellite are reduced. Thirdly, data regeneration and forwarding can be operated in a data layer, forward data storage is achieved, and relay data cannot be lost even if a relay link is interrupted for a short time. For example, in the remote place between earth and moon, it is more appropriate to adopt a data regeneration forwarding system for a system in which a plurality of detectors working on the moon surface are simultaneously relayed.
The relay regeneration forwarding system brings certain time delay due to the characteristics of the relay regeneration forwarding system, and the accurate relay time delay testing method has important significance for evaluating the performance of the system and calibrating the on-orbit time. At present, in the first moon back soft landing task of Chang' e four human beings developed in China, a detector and a patrol device land on the back of the moon, the detector and the patrol device are shielded by the moon after the moon falls off and cannot be seen by the earth, uplink and downlink data cannot be directly transmitted to the ground and need to be forwarded through a relay link, and the relay link is designed as a regenerative forwarding system, so that an effective relay delay testing method needs to be developed urgently. At present, no time delay test method based on a regenerative forwarding system exists at home and abroad.
Disclosure of Invention
The technical problem solved by the invention is as follows: the method overcomes the defects of the prior art, provides a relay time delay ground test method based on a regenerative forwarding satellite relay mode, can accurately obtain the relay time delay required by a task by only adopting a conventional relay link ground test system on the basis of not increasing original equipment (satellites) and ground software and hardware, and provides input for on-orbit time calibration, working program design and the like.
The technical scheme of the invention is as follows:
a relay time delay ground test method based on a regenerative forwarding satellite relay mode comprises the following steps:
step one, connecting a detector and a relay star link together through a wired radio frequency cable to establish a wired relay link; setting the internal delay DeltaT of the detectorDevice for cleaning the skin(ii) a Setting the time delay delta T of the transmission of the radio frequency signal from the detector to the relay satelliteSatellite transmission(ii) a The relay satellite sequentially decodes and codes the radio frequency signal to obtain a coded radio frequency signal; setting the time delay delta T of decoding and coding of relay satelliteStar (star)(ii) a The relay satellite sends the coded radio frequency signal to ground test equipment, and the time delay delta T of the coded radio frequency signal from the relay satellite to the ground test equipment is setSatellite-to-ground transmission(ii) a Calculating the time delay delta T of the whole relay linkSatellite time delay；
Secondly, respectively calibrating the detector and the relay satellite by taking the ground time as a reference, so that the time on the detector and the time on the relay satellite are within an allowable error range with the ground time; determining the time difference between the detector and the relay satellite;
thirdly, the detector generates a detector telemetering source packet and downloads the detector telemetering source packet to ground test equipment through the relay satellite; the relay satellite generates a relay satellite remote measurement source packet by itself; downloading the relay satellite remote measurement source packet to ground comprehensive test equipment; the ground test equipment respectively decodes the data of the detector telemetering source packet and the relay satellite telemetering source packet; respectively decoding time codes t in the detector telemetering source packetDevice for cleaning the skinAnd time code t in relay satellite remote measurement source packetStar (star)Calculating the time code t of the relay satelliteStar (star)And the time code t of the detectorDevice for cleaning the skinThe difference Δ t is tStar (star)-tDevice for cleaning the skin；
Step four, the time code difference delta T comprises the satellite time difference delta TStar time difference of deviceAnd the time delay delta T of the whole relay linkSatellite time delay(ii) a Establishing a calculation formula of the time code difference delta t; judging and calculating the relay satellite time code t according to a delta t calculation formulaStar (star)And the time code t of the detectorDevice for cleaning the skinThe time delay delta T of the whole relay link can be obtained by the difference delta TSatellite time delay。
In the above-mentioned relay time delay ground test method based on the regenerative forwarding satellite relay mode, in the first step, a data management device and a measurement and control data transmission device are arranged in the detector, and the time delay Δ T in the detector is Δ TDevice for cleaning the skinThe sum of the time delay of the data management equipment and the time delay of the measurement and control data transmission equipment; the time delay of the test data management equipment is measured to be delta TCounting tube(ii) a The distance is short and the speed is high when the signals are transmitted between the measurement and control data transmission equipment, and the time delay of the measurement and control data transmission equipment is ignored; the internal delay deltat of the detectorDevice for cleaning the skin＝ΔTCounting tube。
In the above-mentioned relay time delay ground test method based on the regenerative forwarding satellite relay mode, in the first step, the detector and the relay satellite are connected by a wired high-frequency cable for video signal transmission, the transmission distance is short, the speed is high, and the time delay delta T is shortSatellite transmissionAre ignored.
In the above ground relay delay test method based on the regenerative forwarding satellite relay mode, in the first step, a relay demodulation device and a relay modulation device are arranged inside a relay satellite; the relay demodulation equipment realizes decoding processing on the radio frequency signal, and the adopted decoding method is a Viterbi decoding method or an RS decoding method; the relay modulation equipment realizes coding processing on the decoded data to form a coded radio frequency signal, and the adopted coding method is convolutional coding or RS coding.
In the above-mentioned relay time delay ground test method based on the regenerative forwarding satellite relay mode, in the first step, the relay satellite and the ground equipment are connected by a wired high-frequency cable for video signal transmission, the transmission speed is fast, and the time delay Δ T is shortSatellite-to-ground transmissionAre ignored.
In the above-mentioned relay time delay ground test method based on the regenerative forwarding satellite relay mode, in the first step, the time delay Δ T of the relay link isSatellite time delayThe calculation method comprises the following steps:
ΔTsatellite time delay＝ΔTDevice for cleaning the skin+ΔTSatellite transmission+ΔTStar (star)+ΔTSatellite-to-ground transmission。
In the above-mentioned relay time delay ground test method based on the regenerative forwarding satellite relay mode, in the second step, the time of the detector is corrected by taking the ground GPS time as a reference, so as to ensure that the error between the time on the detector and the GPS time is less than or equal to1(ii) a The time of the relay satellite is calibrated by taking the ground GPS time as a reference, so that the error between the time of the relay satellite and the GPS time is less than2(ii) a The time difference between the detector and the relay satellite is smaller than1+2。
In the above-mentioned relay time delay ground test method based on the regenerative forwarding satellite relay mode, in the third step, the relay satellite time code tStar (star)And the time code t of the detectorDevice for cleaning the skinThe difference Δ t is calculated by:
Δt＝tstar (star)-tDevice for cleaning the skin。
In the above-mentioned terrestrial test method for relay delay based on the regenerative forwarding satellite relay method, in the fourth step, as can be seen from the first step, the delay Δ T of the whole relay link is obtainedSatellite time delayIncluding the internal delay deltat of the detectorDevice for cleaning the skinTime delay delta T of decoding and encoding of relay satelliteStar (star)RF signal slave probeTime delay delta T of transmission of detector to relay satelliteSatellite transmissionAnd the time delay delta T of the coded radio frequency signal from the relay satellite to the ground test equipmentSatellite-to-ground transmission(ii) a According to the first step, the time delay delta T of the radio frequency signal transmitted from the detector to the relay satelliteSatellite transmission0; time delay delta T of coded radio frequency signal from relay satellite to ground test equipmentSatellite-to-ground transmission＝0；
The calculation formula of the time code difference Δ t is:
according to the second step, the detector and the relay satellite are calibrated with the GPS, namely delta TStar time difference of device<If so, let Δ TStar time difference of device＝0；
Then Δ T is equal to Δ TSatellite time delay＝ΔTDevice for cleaning the skin+ΔTStar (star)(ii) a Namely, Delta TSatellite time delayBy measuring the internal delay DeltaT of the probeDevice for cleaning the skinAnd time delay delta T of decoding and encoding of relay satelliteStar (star)Composition is carried out; by calculating the time code t of the relay satelliteStar (star)And the time code t of the detectorDevice for cleaning the skinThe time delay delta T of the whole relay link can be obtained by the difference delta TSatellite time delay。
Compared with the prior art, the invention has the beneficial effects that:
(1) the on-board (or on-board) relay related equipment and the ground test equipment adopted by the invention are basic configurations adopted in the original development task, the time codes contained in the telemetering source packets of the detector and the relay satellite are also configured according to the standard of the related space data system standard, and the ground test equipment also needs to decode the time codes, so that additional on-board (or on-board) and ground equipment does not need to be added;
(2) the invention provides a time delay testing method based on a regenerative forwarding system for the first time, and system time delay of a relay link can be obtained by calculating inherent time scales in telemetering data in different detectors (or satellites) in the relay link on the basis of not adding hardware and software equipment related to an on-board (or on-board) relay system and a ground test system.
Drawings
FIG. 1 is a flow chart of attitude coupling control according to the present invention;
fig. 2 is a schematic diagram of the relay link of the present invention.
Detailed Description
The invention is further illustrated by the following examples.
The relay forwarding of the satellite generally comprises two systems of regenerative forwarding and transparent forwarding. The transparent forwarding is relatively simple, is widely used for earth orbit relay communication tasks, but is not suitable for remote communication; the regenerative forwarding has the advantage of using coding gain to make up the radio frequency link power shortage caused by the distance, so that the regenerative forwarding can be used for long-distance relay communication such as deep space exploration. Due to inherent characteristics, the regenerative forwarding brings certain system time delay, and the accurate relay time delay testing method has important significance for evaluating system performance and on-orbit time calibration, and no relevant reference exists at present.
Firstly, connecting a detector, a relay satellite and ground test equipment together through a wired radio frequency cable to establish a wired relay link; and respectively calibrating the detector and the relay satellite by taking the ground time as a reference, respectively decoding the data of the telemetering source packets of the detector and the relay satellite by the ground comprehensive test equipment, solving the time codes in the telemetering source packets of the detector and the relay satellite which are closest to each other, and calculating the time delay of the relay system by the time codes.
The invention provides a time delay testing method based on a regenerative forwarding system for the first time, the specific flow is shown in figure 1, and the method mainly comprises the following steps:
step one, connecting a detector and a relay star link together through a wired radio frequency cable to establish a wired relay link, as shown in fig. 2; setting the internal delay DeltaT of the detectorDevice for cleaning the skin(ii) a The detector is internally provided with data management equipment and measurement and control data transmission equipment, and the internal time delay delta T of the detectorDevice for cleaning the skinThe sum of the time delay of the data management equipment and the time delay of the measurement and control data transmission equipment; the time delay of the test data management equipment is measured to be delta TCounting tube(ii) a The distance is short and the speed is high when the signals are transmitted between the measurement and control data transmission equipment, and the time delay of the measurement and control data transmission equipment is ignored; thenInternal time delay delta T of detectorDevice for cleaning the skin＝ΔTCounting tube. Setting the time delay delta T of the transmission of the radio frequency signal from the detector to the relay satelliteSatellite transmission(ii) a The detector and the relay satellite are connected by adopting a wired high-frequency cable for video signal transmission, the transmission distance is short, the speed is high, and the time delay delta T isSatellite transmissionAre ignored. The relay satellite sequentially decodes and codes the radio frequency signal to obtain a coded radio frequency signal; setting the time delay delta T of decoding and coding of relay satelliteStar (star)(ii) a The relay demodulation equipment and the relay modulation equipment are arranged in the relay satellite; the relay demodulation equipment realizes decoding processing on the radio frequency signal, and the adopted decoding method is a Viterbi decoding method or an RS decoding method; the relay modulation equipment realizes coding processing on the decoded data to form a coded radio frequency signal, and the adopted coding method is convolutional coding or RS coding. The relay satellite sends the coded radio frequency signal to ground test equipment, and the time delay delta T of the coded radio frequency signal from the relay satellite to the ground test equipment is setSatellite-to-ground transmission(ii) a The relay satellite and the ground equipment are connected by adopting a wired high-frequency cable for video signal transmission, the transmission speed is high, and the time delay delta T isSatellite-to-ground transmissionAre ignored. Calculating the time delay delta T of the whole relay linkSatellite time delay(ii) a Time delay delta T of relay linkSatellite time delayThe calculation method comprises the following steps: delta TSatellite time delay＝ΔTDevice for cleaning the skin+ΔTSatellite transmission+ΔTStar (star)+ΔTSatellite-to-ground transmission。
For detector internal time delay delta TDevice for cleaning the skinTime delay delta T of radio frequency signal transmitted from detector to relay satelliteSatellite transmissionTime delay delta T of decoding and coding of relay satelliteStar (star)And the time delay delta T of the coded radio frequency signal from the relay satellite to the ground test equipmentSatellite-to-ground transmissionThe specific principle of judgment is as follows:
internal time delay delta T of detectorDevice for cleaning the skin: the internal delay of the detector usually includes the internal delay of a data management system and the internal delay of a measurement and control data transmission system, and the measurement and control data transmission system of the common detector has video signal transmission, approximately optical speed transmission, and a transmission path because the video signal transmission is performed between devices (such as a solid-state amplifier, a frequency converter, a cable, an antenna, a waveguide switch and the like)The distance is short and hence the delay is negligible.
Time delay delta T of radio frequency signal transmitted from detector to relay satelliteSatellite transmission: the detector and the relay satellite are usually connected by a wired high-frequency cable for video signal transmission, which is approximately light speed transmission, and compared with the light speed, the transmission path distance is short and the time delay is negligible.
Time delay delta T of decoding and coding of relay satelliteStar (star): according to the principle of regenerative forwarding, the relay demodulation device firstly decodes (such as viterbi decoding and RS decoding) the received data; then, the relay modulation device encodes the decoded data (such as convolutional coding and RS coding), which all brings a certain system delay.
Time delay delta T of coded radio frequency signal from relay satellite to ground test equipmentSatellite-to-ground transmission: time delay delta T of radio frequency signal transmitted from relay satellite to ground test equipmentSatellite-to-ground transmission. The relay satellite and the ground equipment are usually connected by adopting a wired high-frequency cable for video signal transmission, the transmission is approximate to light speed transmission, the distance of a common transmission path is shorter relative to the light speed, and the time delay can be ignored.
Step two, the step needs to carry out time calibration on the detector and the relay satellite so as to eliminate the satellite time difference delta T for the follow-upStar time difference of devicePreparation is made. The method comprises the steps that the ground time is used as a reference to respectively calibrate the detector and the relay satellite, so that the time on the detector and the time on the relay satellite are within an allowable error range with the ground time; the time of the detector is calibrated by taking the ground GPS time as a reference, and the error between the time on the detector and the GPS time is ensured to be less than1(ii) a The time of the relay satellite is calibrated by taking the ground GPS time as a reference, so that the error between the time of the relay satellite and the GPS time is less than2(ii) a Determining the time difference between the detector and the relay satellite when the time difference between the detector and the relay satellite is smaller than1+2. And time calibration axes are respectively completed for the detector and the relay satellite through ground GPS time, so that the time difference range between the detector and the relay satellite is ensured.
Step three, acquiring the time code of the detector and the time code and time code division of the relay satelliteThe method is respectively contained in a telemetry source packet of a detector and a telemetry source packet of a relay satellite, and 2 telemetry source packets need to be decoded and obtained through ground test equipment, and specifically comprises the following steps: the detector generates a detector telemetering source packet and transmits the detector telemetering source packet to ground test equipment through the relay satellite; the relay satellite generates a relay satellite remote measurement source packet by itself; downloading the relay satellite remote measurement source packet to ground comprehensive test equipment; the ground test equipment respectively decodes the data of the detector telemetering source packet and the relay satellite telemetering source packet; respectively decoding time codes t in the detector telemetering source packetDevice for cleaning the skinAnd time code t in relay satellite remote measurement source packetStar (star)From the time code t in the source packet of the probe telemetryDevice for cleaning the skinAnd time code t in relay satellite remote measurement source packetStar (star)Calculating the time code t of the relay satelliteStar (star)And the time code t of the detectorDevice for cleaning the skinThe difference Δ t is tStar (star)-tDevice for cleaning the skin(ii) a The method for calculating Δ t is as follows: Δ t ═ tStar (star)-tDevice for cleaning the skin. Because the telemetering source of the detector and the relay satellite comprises time codes which are configured according to the standard of the relevant space data system standard and are parameters which are fixedly set, the decoding value of the time codes which are decoded by the ground test equipment is the difference of the stable and accurate time codes.
Step four, firstly, the composition of the time code difference delta T is analyzed, and the time code difference delta T comprises the satellite time difference delta TStar time difference of deviceAnd the time delay delta T of the whole relay linkSatellite time delay(ii) a Establishing a calculation formula of the time code difference delta t; judging and calculating the relay satellite time code t according to a delta t calculation formulaStar (star)And the time code t of the detectorDevice for cleaning the skinThe time delay delta T of the whole relay link can be obtained by the difference delta TSatellite time delay。
According to the step one, the time delay delta T of the whole relay linkSatellite time delayIncluding the internal delay deltat of the detectorDevice for cleaning the skinTime delay delta T of decoding and encoding of relay satelliteStar (star)Time delay delta T of radio frequency signal transmitted from detector to relay satelliteSatellite transmissionAnd the time delay delta T of the coded radio frequency signal from the relay satellite to the ground test equipmentSatellite-to-ground transmission(ii) a According to the first step, the time delay delta T of the radio frequency signal transmitted from the detector to the relay satelliteSatellite transmission0; encodingTime delay delta T of rear radio frequency signal from relay satellite to ground test equipmentSatellite-to-ground transmission＝0；
The calculation formula of the time code difference Δ t is:
according to the second step, the detector and the relay satellite are calibrated with the GPS, namely delta TStar time difference of device<If so, let Δ TStar time difference of device＝0；
Then Δ T is equal to Δ TSatellite time delay＝ΔTDevice for cleaning the skin+ΔTStar (star)(ii) a Namely, Delta TSatellite time delayBy measuring the internal delay DeltaT of the probeDevice for cleaning the skinAnd time delay delta T of decoding and encoding of relay satelliteStar (star)Composition is carried out; by calculating the time code t of the relay satelliteStar (star)And the time code t of the detectorDevice for cleaning the skinThe time delay delta T of the whole relay link can be obtained by the difference delta TSatellite time delay。
On the basis of not increasing original devices (stars) and ground software and hardware, the invention only adopts a conventional relay link ground test system, can accurately obtain the relay time delay required by the task, and provides input for on-orbit time calibration, working program design and the like.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Claims (9)
1. A relay time delay ground test method based on a regenerative forwarding satellite relay mode is characterized in that: the method comprises the following steps:
step one, connecting the detector and the relay star link to a device through a wired radio frequency cableFirstly, establishing a wired relay link; setting the internal delay DeltaT of the detectorDevice for cleaning the skin(ii) a Setting the time delay delta T of the transmission of the radio frequency signal from the detector to the relay satelliteSatellite transmission(ii) a The relay satellite sequentially decodes and codes the radio frequency signal to obtain a coded radio frequency signal; setting the time delay delta T of decoding and coding of relay satelliteStar (star)(ii) a The relay satellite sends the coded radio frequency signal to ground test equipment, and the time delay delta T of the coded radio frequency signal from the relay satellite to the ground test equipment is setSatellite-to-ground transmission(ii) a Calculating the time delay delta T of the whole relay linkSatellite time delay；
Secondly, respectively calibrating the detector and the relay satellite by taking the ground time as a reference, so that the time on the detector and the time on the relay satellite are within an allowable error range with the ground time; determining the time difference between the detector and the relay satellite;
thirdly, the detector generates a detector telemetering source packet and downloads the detector telemetering source packet to ground test equipment through the relay satellite; the relay satellite generates a relay satellite remote measurement source packet by itself; downloading the relay satellite remote measurement source packet to ground comprehensive test equipment; the ground test equipment respectively decodes the data of the detector telemetering source packet and the relay satellite telemetering source packet; respectively decoding time codes t in the detector telemetering source packetDevice for cleaning the skinAnd time code t in relay satellite remote measurement source packetStar (star)Calculating the time code t of the relay satelliteStar (star)And the time code t of the detectorDevice for cleaning the skinThe difference Δ t is tStar (star)-tDevice for cleaning the skin；
Step four, the time code difference delta T comprises the satellite time difference delta TStar time difference of deviceAnd the time delay delta T of the whole relay linkSatellite time delay(ii) a Establishing a calculation formula of the time code difference delta t; judging and calculating the relay satellite time code t according to a delta t calculation formulaStar (star)And the time code t of the detectorDevice for cleaning the skinThe time delay delta T of the whole relay link can be obtained by the difference delta TSatellite time delay。
2. The ground relay delay test method based on the regenerative forwarding satellite relay mode according to claim 1, wherein: in the first step, a data tube is arranged in the detectorArrangement equipment, measurement and control data transmission equipment and detector internal time delay delta TDevice for cleaning the skinThe sum of the time delay of the data management equipment and the time delay of the measurement and control data transmission equipment; the time delay of the test data management equipment is measured to be delta TCounting tube(ii) a The distance is short and the speed is high when the signals are transmitted between the measurement and control data transmission equipment, and the time delay of the measurement and control data transmission equipment is ignored; the internal delay deltat of the detectorDevice for cleaning the skin＝ΔTCounting tube。
3. The ground relay delay test method based on the regenerative forwarding satellite relay mode according to claim 2, wherein: in the first step, the detector and the relay satellite are connected by adopting a wired high-frequency cable for video signal transmission, the transmission distance is short, the speed is high, and the time delay delta T is shortSatellite transmissionAre ignored.
4. The ground relay delay test method based on the regenerative forwarding satellite relay mode according to claim 3, wherein: in the first step, relay demodulation equipment and relay modulation equipment are arranged inside the relay satellite; the relay demodulation equipment realizes decoding processing on the radio frequency signal, and the adopted decoding method is a Viterbi decoding method or an RS decoding method; the relay modulation equipment realizes coding processing on the decoded data to form a coded radio frequency signal, and the adopted coding method is convolutional coding or RS coding.
5. The ground relay delay test method based on the regenerative forwarding satellite relay mode according to claim 4, wherein: in the first step, the relay satellite and the ground equipment are connected by adopting a wired high-frequency cable for video signal transmission, the transmission separation speed is high, and the time delay delta T is shortSatellite-to-ground transmissionAre ignored.
6. The ground relay delay test method based on the regenerative forwarding satellite relay mode according to claim 5, wherein: in the first step, the time delay delta T of the relay linkSatellite time delayThe calculation method comprises the following steps:
ΔTsatellite time delay＝ΔTDevice for cleaning the skin+ΔTSatellite transmission+ΔTStar (star)+ΔTSatellite-to-ground transmission。
7. The ground relay delay test method based on the regenerative forwarding satellite relay mode according to claim 1, wherein: in the second step, the ground GPS time is used as a reference to correct the time of the detector, so that the error between the time on the detector and the GPS time is less than1(ii) a The time of the relay satellite is calibrated by taking the ground GPS time as a reference, so that the error between the time of the relay satellite and the GPS time is less than2(ii) a The time difference between the detector and the relay satellite is smaller than1+2。
8. The ground relay delay test method based on the regenerative forwarding satellite relay mode according to claim 1, wherein: in the third step, the relay satellite time code tStar (star)And the time code t of the detectorDevice for cleaning the skinThe difference Δ t is calculated by:
Δt＝tstar (star)-tDevice for cleaning the skin。
9. The ground relay delay test method based on the regenerative forwarding satellite relay mode as claimed in one of claims 1 to 8, wherein: in the fourth step, as can be seen from the first step, the time delay Δ T of the whole relay linkSatellite time delayIncluding the internal delay deltat of the detectorDevice for cleaning the skinTime delay delta T of decoding and encoding of relay satelliteStar (star)Time delay delta T of radio frequency signal transmitted from detector to relay satelliteSatellite transmissionAnd the time delay delta T of the coded radio frequency signal from the relay satellite to the ground test equipmentSatellite-to-ground transmission(ii) a According to the first step, the time delay delta T of the radio frequency signal transmitted from the detector to the relay satelliteSatellite transmission0; time delay delta T of coded radio frequency signal from relay satellite to ground test equipmentSatellite-to-ground transmission＝0；
The calculation formula of the time code difference Δ t is:
according to the second step, the detector and the relay satellite are calibrated with the GPS, namely delta TStar time difference of device<If so, let Δ TStar time difference of device＝0；
Then Δ T is equal to Δ TSatellite time delay＝ΔTDevice for cleaning the skin+ΔTStar (star)(ii) a Namely, Delta TSatellite time delayBy measuring the internal delay DeltaT of the probeDevice for cleaning the skinAnd time delay delta T of decoding and encoding of relay satelliteStar (star)Composition is carried out; by calculating the time code t of the relay satelliteStar (star)And the time code t of the detectorDevice for cleaning the skinThe time delay delta T of the whole relay link can be obtained by the difference delta TSatellite time delay。
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