Feedforward tracking control method and system for inter-satellite laser communication system

Abstract

The invention provides a feedforward tracking control method and system for an inter-satellite laser communication system. The method comprises the following steps: acquiring orbit information of double satellites, and acquiring light spot centroid position information according to real-time feedback information of a detection camera; if the light spot centroid is in a fine tracking window, calculating the tracking amount of a fine aiming mechanism according to the centroid miss distance, and if the light spot centroid is outside the fine tracking window, calculating the tracking amount of a coarse aiming mechanism according to the centroid miss distance; according to the response control bandwidth of a tracking system and the relative movement speed between satellites, calculating a tracking error caused by relative movement of the satellites under the condition of considering the system time delay, and obtaining a feedforward tracking compensation amount; and if the feed-forward tracking compensation amount is greater than the control precision of the coarse aiming mechanism, adding the feed-forward tracking compensation amount to the tracking amount of the coarse aiming mechanism, and if the feed-forward tracking compensation amount is less than the control precision of the coarse aiming mechanism, adding the feed-forward tracking compensation amount to the tracking amount of the fine aiming mechanism to obtain the tracking angle control amount. According to the method, the tracking control precision is effectively improved, and the steady-state tracking capability of the laser inter-satellite link is improved.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a feedforward tracking control method and system for an inter-satellite laser communication system. Background technique [0002] The inter-satellite laser communication system has the advantages of high communication rate, large communication capacity, strong anti-interference ability, good confidentiality, and miniaturized terminals. It is one of the important development trends of future space networks. At present, China, the United States, Europe, etc. have successively carried out inter-satellite laser communication experiments. Among them, my country began to carry out satellite laser communication experiments on the Ocean-2 satellite at the end of 2011. Since then, my country has successfully carried out satellite laser communication experiments on the Shijian 13th satellite and the Beidou system. In 2020, the Eighth Academy of Aerospace Science and Technology Corpor...

AI Technical Summary

Problems solved by technology

[0003] The traditional tracking method only calculates the tracking control amount based on the spot centroid position fed back by the camera, and there is a tracking response lag, which makes it difficult to track the steady state of the inter-satellite laser communication link with high-speed relative motion, and it is difficult to carry out long-term stable communication of the inter-satellite laser link, etc. Problems that adversely affect the high-speed networking of the space laser network system

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