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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。
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.
第四章研究了低频UWB-SAR系统的极化校准问题。 首先研究了定标体的多极化电磁散射特性。
The polarimetric calibration methods for low frequency UWB-SAR are studied in chapter 4. Firstly, polarimetric electromagnetic scattering characteristics of the calibrators are studied.
实验时采用已知rcs值的标准金属球作为定标体，使用相对定标法对系统进行外定标实验，得到定标数据。
A standard metal ball with known RCS value has been used as the calibration body in the external calibration experiment which used a relative calibration method and acquired the calibration data.
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