Research On Key Techniques For Multi-Satellite United Mission Planning

Along with the development of China's aerospace industry, satellites are improved greatly in quality and quantity, which urgently requests the united multi-satellite mission planning in the ground application system. Multi-satellite mission planning considered both satellites and ground stations, reasonably resolved the conflicts in multi-satellite missions under the imaging constrains of each satellite, then gained independent mission sequence of each satellite, which could correspondingly guide the single-satellite task scheduling, and achieve the effective use of satellites and ground stations, and integrate the existing single-satellite mission scheduling system.This paper focused on the key techniques for the united multi-satellite mission planning on the base of practical background. The major contents are as following:Based on analysis of united multi-satellite mission planning, we constructed a general framework, which used a scalable organization of satellites and ground stations, and imported the rule-based expert system, and combined the decision-making module.The implementation technique of the united mission planning expert system (UMPES) was studied. We designed the structure of UMPES. The method of knowledge representation was studied, expressing facts with Semantic Network, and expressing expert knowledge with Production Rule. The rule engine with three-level reasoning module was designed and implemented. We designed rule classification mechanism to improve the efficiency of UMPES.An optimized decision-making method of the mission conflicts in united mission planning was proposed. For imaging mission conflicts, we constructed an undirected graph module, and proposed a multi-criteria decision-making algorithm. And for transmission mission conflicts, we constructed a directed graph module, and proposed a multi-criteria decision-making algorithm.Lastly, by use of the study above, A united multi-satellite mission planning system was implemented, which had been applied and achieved good results.