Space division and time division intersatellite link rapid building method based on space-time prior link building information

Abstract

A space division and time division intersatellite link rapid building method based on space-time prior link building information includes the steps that TOA of a next effective measurement communication time slot is calculated; the position vector and the speed vector from a satellite A to a satellite B in the next effective measurement communication time slot are calculated, and the speed vector is projected to the position vector direction to obtain Doppler information FOA; ephemeris parameters are forecasted by the satellite A and the satellite B, the position of the satellite A relative to an earth core inertial coordinate system and the position of the satellite B relative to the earth core inertial coordinate system in the next measurement communication time slot are calculated respectively, and the center of mass direction vector from the center of mass of the satellite A to the center of mass of the satellite B in the next measurement communication time slot is calculated; an antenna pointing Euler angle of the satellite A under a satellite A antenna coordinate system is obtained through conversion, and then an intersatellite link between the satellite A and the satellite B is built. By the adoption of the method, rapid alignment of scanning beam antennas and low-cost capture of spread spectrum signals of the intersatellite link can be achieved, intersatellite link satellite load link building time and complexity are reduced, and reliability is improved.

Description

technical field [0001] The present invention mainly relates to the field of satellite networks, in particular to a space-time prior link establishment information calculation method for a space-division time-division inter-satellite link system, which is suitable for satellite formations or constellations based on space-division time-division multiple access inter-satellite link systems The network establishes the link quickly. Background technique [0002] There are mainly two types of inter-satellite links, namely relative measurement and inter-satellite communication, which have been widely used in navigation, communication and other fields, such as GPS satellite navigation system and Iridium (Iridium) communication satellite system. The inter-satellite link can realize the satellite formation or satellite constellation system to obtain the measurement information of other arcs on the orbit through the precise measurement of the inter-satellite link when only a few monito...

AI Technical Summary

Problems solved by technology

If the code rate of the signal system design is 10.23Mbps, the pseudo-code length is 10230, and the signal transmission frequency is 20GHz, the entire pseudo-code period that needs to be searched, that is, 10230 chips, and the Doppler range is ±313.3KHz, according to the usual half Pseudo-code search interval of 1 chip and frequency search interval of 1KHz, the number of grid points to be searched is up to 12820240, which brings great difficulty to the realization of capture

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