Research on the high stability of the zero value for spread-spectrum TT&C simulator

To meet the testing requirements for the stability of the zero value about satellite-based spread-spectrum transponder and the TT&C earth station, the stabilization technique of zero value about spread-spectrum TT&C simulator is studied. A structure of TT&C simulator for correcting the zero value in the real-time by broadband self-closed-loop calibration channel is proposed. In this structure, output power of transmitting signal can be regulated by numerical control, the time delay of both power conditioning module and calibration channel is calibrated and stored in advance, and the stability of the zero value less than 0.1m is achieved. The experimental results verify the validity of this study, and it has been successfully applied to an aerospace engineering.