A network topology planning method for time-varying inter-satellite links in satellite navigation systems

Abstract

The present invention provides a time-varying inter-satellite link network topology planning method for a satellite navigation system. The overall design idea is to sequentially solve the inter-satellite link topology in each time slot, and each time the inter-satellite link topology solution of a time slot is completed, Update the algorithm parameters and then solve the inter-satellite link topology for the next time slot. After completing the solution of the inter-satellite link network topology for all time slots, perform global optimization, and finally output a topology plan for the link establishment cycle.

Description

technical field [0001] The invention relates to the field of satellites, in particular to a network topology planning method for time-varying inter-satellite links in a satellite navigation system. Background technique [0002] The inter-satellite link is to establish a wireless link between satellites. In the navigation system, the construction of the inter-satellite link can realize the communication and ranging functions between the satellites. The use of the inter-satellite link communication can more frequently update the navigation ephemeris Update to improve the service performance of the navigation system, and at the same time realize the forwarding of measurement and control information, and conduct indirect measurement and control of the navigation constellation; use the inter-satellite link for inter-satellite ranging, which can improve the accuracy of satellite orbit determination, or when there is no ground station support Realize the autonomous operation of the...

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Problems solved by technology

[0006] (1) The inter-satellite link mainly has the functions of communication and measurement, but some methods are difficult to take into account both at the same time. One of the functions is used as the optimization target of the inter-satellite link network topology planning, while the other function is ignored. requirements, resulting in unbalanced inter-satellite link network performance, which is difficult to apply in practice

[0007] (2) The existing method only considers the use requirements of the inter-satellite link in the system, and fails to take into account the use requirements of the inter-satellite link for other extended users outside the system

[0009] (4) Some existing methods take the optimal satellite geometric configuration (DOP value) as the optimization goal. As the DOP value decreases, the improvement effect on satellite orbit determination accuracy will become limited. If the geometric configuration The optimization of the system wastes inter-satellite link resources to a certain extent

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