The Analysis for the Affecting Factors of Earth Synchronous Satellite Orbit Determination Error

Aiming at the preliminary orbit determination error of certain shipboard microwave unified tracking telemetry and command system of C frequency band(UCB) equipment in performing the earth synchronous satellite laughing missions, by analyzing correction, axessystematic error propagation and instrumentation ship error track, focusing on the problems sorted. Analyses the methods of error tracing, orbit determination based on analyzing the effects of constant error, axes-systematic error and ship’s position error. The problem of a big UCB injection error is a consequence of improper use of orbit model and inaccurate calibration of optical-electrical axis non-parallelism, which is caused by the change of optical axis. Accurate positioning problems and the effective methods is provided for orbit determination strategy and optical axis changes. Keywords-orbit determination error; orbit elements; earth synchronous satellite; axes-systematic error; preliminary orbit determination