低频SAR天线通常具有极宽的方位向波束角，在辐射定标时，定标体RCS随雷达波入射角的变化不能够忽略，文中利用低频散射模型，得到定标体RCS随角度变化关系，结合条带式低频SAR的工作原理，给出辐射校准的方法，并进行仿真试验，验证了该方法的有效性。

Antenna of low frequency SAR usually has very wide azimuth beam width along track. The changes of the RCS of the calibrator with the incident angle of electromagnetic wave cannot be neglected during the radiometric calibration. In this paper, RCS of the calibrator as a function of incident angle has been calculated at low frequency using MOM. Combining with the theory of strip-mode SAR, a calibration method is proposed and computer simulation is used to verify the validity of this calibration method. Simulation results verified the effectiveness of this method.

TN958