Performance evaluation on time and frequency transfer of transponder satellite positioning system

Transponder satellite positioning system uses common business geostationary orbit communication satellites to combine the navigation satellite constellation. We first obtain the observation data of navigation signal. By disposing these data, we analyze different error sources which could impact the timing accuracy, then calculate the signal frequency windage from navigation satellites that has the possibility to greatly impact the capability of user receivers. What´s more, the evaluations on timing and velocity measurement performances of transponder satellite positioning system are given.