扩频测控模拟器高稳零值技术研究

为适应对星载扩频应答机和测控地面站零值稳定性指标的评测需求，对扩频测控模拟器的零值稳定技术进行研究，提出了一种在扩频测控模拟器中通过宽带自闭环校准通道进行零值实时校正的方法。发射通道信号输出功率可数控调节，接收通道通过数字AGC适应接收功率的变化范围，满足不同输出功率下的零值校正。发射功率调节模块和校准通道的零值延时事先标定存储，并通过恒温确保事先标定零值的稳定性。实测结果验证了方法的有效性，实现了小于0.1m的零值稳定性，已成功应用于某航天工程。

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.