低频超宽带SAR定标体散射特性

Scattering of the Calibrator for Low Frequency UWB SAR

摘要:

低频超宽带合成孔径雷达辐射定标过程中,定标体的散射特性表现为低频谐振散射特性。常规散射特性计算方法如矩量法中的广义阻抗矩阵在谐振频率点上条件数过大,导致计算不准确。本文给出了基于奇异值分解的方法得到较为精确的计算值。为了克服矩量法每次只能计算一个频点的散射特性,本文给出了基于渐进波形估计的方法,获得定标体超宽带散射特性。

Abstract:

During the radiometric calibration of the low frequency UWB SAR system,the scattering model of the calibrators should be regarded as the low frequency resonance scattering.The regular numerical algorithm is MOM, whose general impedance matrix has a large