Abstract: Based on the configuration plan of BeiDou 3 satellites, a coplanar regional autonomous navigation algorithm for Beidou satellites is proposed. In the algorithm,the two way Ka ranging information collected by the co orbit satellites is designed to transmit to the main satellite by the laser inter satellite links and then with the ranging information, the main satellite can update the coplanar satellites’orbit information centralizedly. The algorithm takes full advantage of the flexible direction switching feature of Ka inter satellite links and the high speed communication feature of laser links and also overcomes the communication difficulties between different planes and direction switching weaknesses of the laser links. In addition, an intra satellite simulation environment is built to verify the accuracy and feasibility of the algorithm. The simulation results show that the regional centralized autonomous navigation algorithm can stably run in the simulation environment, and its navigation accuracy is much better than that of the distributed autonomous navigation.

Key words: font-size:10.5pt, ">Beidou navigation satellite systemfont-size:10.5pt, ">；Inter satellite link；Autonomous navigation；User equivalent ranging error(URE)