Algorithm and Simulation of Autonomous Orbit Determination for Navigation Satellites

With the launch and operation of China navigation satellites, it is urgently essential to automatically determine the satellite orbit under restricted conditions. We have established a mathematical model for autonomous orbit determination using satellite-to-satellite distance observations, in which the attitude parameters are derived based on quasi-distances between GPS satellites and a filtering algorithm. The result indicates that the accuracy of automatically determining orbits is better than that from GPS broadcasting ephemerides.