星载sAR辐射定标误差分析及成像处理器增益计算
ANALYSIS OF ERROR IN RADIOMETRIC CALIBRATION FOR SPACEBORNE SAR AND CALCULATION OF IMAGING PROCESSOR GAIN
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摘要: 本文对星载SAR辐射定标的各项误差因素进行了分析，提出了计算辐射定标误差的公式，提供了分配星载SAR系统辐射定标误差的工具；对基于CS(Chirp Scaling)算法的成像处理器的增益计算公式进行了推导，并通过计算机仿真得到了验证；定量地分析了成像处理器增益计算误差对SAR系统辐射定标精度的影响。Abstract: Various factors leading to error in spaceborne SAR radiometric calibration are discussed,and an equation to estimate the radiometric calibration error is proposed．The equation for calculating SAR imaging processor gain based on chirp scaling algorithm is derived,and testified through computer simulation experiments.A quantitative conclusion on the contribution of imaging processor gain to SAR radiometric calibration error is obtained.
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