大功率星载合成孔径雷达(SAR)天线因脉冲重复频率(PRF)工作的峰值功率导致卫星一次电源母线上形成一定幅值的脉动电流,其对卫星平台母线的安全稳定运行具有重要影响。文中分析了SAR天线电源系统脉动电流的特性,建立了SAR天线电源系统脉动电流传输的交流电路模型。在此基础上,分析了一次电源内阻、输入与输出电容、PRF等参数对一次母线脉动电流抑制的理论依据,说明了SAR天线电源输出电容容量是抑制母线脉动电流的关键因素。仿真和实验验证了分析结果的正确性,说明文中研究对SAR卫星工程中电源系统脉动电流的抑制具有一定的参考价值。

The peak power of the high-power spaceborne synthetic aperture radar (SAR) antenna, which operates at pulse repetition frequency (PRF), could cause some pulsating current on the satellite primary bus. This current has a critical impact on the safety and stability of the platform bus. The characteristics of pulsating current in the SAR antenna power system are analyzed, and alternating current model for pulsating current transfer in SAR antenna power system is built. On this basis, the suppression effect by the primary bus intrinsic impedance, input and output capacitance, and PRF is discussed, and the output capacitance is found out to be the key factor of pulsating current suppression. Simulation and experimental results validate the theoretical analysis, showing certain reference value for the pulsating current suppression of power system in SAR satellite engineering.

TN958