High-precision relative distance measurement and time synchronization method based on inter-satellite link

An inter-satellite link and time synchronization technology, applied in multiplexing communication, time-division multiplexing system, radio transmission system, etc., can solve problems such as difficulty in achieving absolute simultaneous measurement, distance variation, clock difference error, etc. , to achieve the effect of eliminating signal transmission delay, easy to implement, and high measurement accuracy

Inactive Publication Date: 2017-11-24
10TH RES INST OF CETC
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Problems solved by technology

Although the two-way comparison method eliminates the influence of the propagation path and improves the measurement accuracy, the inter-satellite two-way time synchronization comparison based on the inter-satellite link is calculated by using the measured value of the two-way pseudo-range at the same moment of the link

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  • High-precision relative distance measurement and time synchronization method based on inter-satellite link
  • High-precision relative distance measurement and time synchronization method based on inter-satellite link
  • High-precision relative distance measurement and time synchronization method based on inter-satellite link

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Embodiment Construction

[0016] refer to figure 1 . The working principle of the high-precision relative ranging and time synchronization method based on the inter-satellite link of the present invention is as follows: first, the two satellites A and B establishing the link are based on their respective on-board frequency standards, and the two satellites are When each transmitting time slot arrives, it sends an information frame with the same structure to the other party; then, in the receiving time slot, satellites A and B capture, track, and demodulate the received signal of the other party, recover the information frame, and use it during measurement. When the local epoch is extracted at the leading edge of the slot synchronization head, the local pseudorange is calculated in conjunction with the other party to measure the time slot to send the epoch; then, the dynamic error model is used to compensate and correct the pseudorange measurement error caused by the relative motion between the two sate...

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Abstract

The invention discloses a high-precision relative distance measurement and time synchronization method based on an inter-satellite link, aiming to provide a distance measurement and time synchronization with high measurement accuracy. The present invention is realized through the following technical solutions: the inter-satellite link is established based on the respective satellite carrier frequency standards of two satellites A and B respectively, and the speed measurement information and clock error are incorporated into the dynamic error model; In the receiving time slot, capture, track, and demodulate the received signal of the other party, recover the information frame, and calculate the local pseudorange when the epoch is sent in conjunction with the other party's measurement time slot; finally, the A star and the B star will respectively correct The subsequent pseudorange is embedded in the local baseband data and sent to the other party. The two satellites independently use the locally measured corrected pseudorange and the other party’s corrected pseudorange demodulated from the received information frame to obtain the inter-satellite relative distance value and time difference, adjust the clocks of the two satellites, and correct the satellite ephemeris and clock parameters.

Description

technical field [0001] The invention relates to a high-precision relative ranging and time synchronization method based on an inter-satellite link. Background technique [0002] The research work of satellite inter-satellite link was carried out relatively early abroad, and it has been widely used in the world, mainly used in GPS satellite navigation system, tracking and data relay satellite system, communication system, medium and low orbit communication Satellite network systems, ocean and ground observation satellite systems, etc. At the same time, with the development of small satellites, in order to maintain the configuration of satellite formation flight, distance measurement, time synchronization and control command transmission between satellites are required. Therefore, it is very necessary to establish a reliable inter-satellite link. The inter-satellite link is used to realize inter-satellite communication, complete fault detection and processing, operation manag...

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Application Information

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IPC IPC(8): H04J3/06H04B7/185
CPCH04J3/0638H04B7/18521H04J3/0682
Inventor 刘明凯
Owner 10TH RES INST OF CETC
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