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高分辨率SAR定标参考目标辐射特性的校正方法

洪峻 雷大力 王宇 费春娇

洪峻, 雷大力, 王宇, 费春娇. 高分辨率SAR定标参考目标辐射特性的校正方法[J]. 电子与信息学报, 2016, 38(2): 418-424. doi: 10.11999/JEIT150570
引用本文: 洪峻, 雷大力, 王宇, 费春娇. 高分辨率SAR定标参考目标辐射特性的校正方法[J]. 电子与信息学报, 2016, 38(2): 418-424. doi: 10.11999/JEIT150570
HONG Jun, LEI Dali, WANG Yu, FEI Chunjiao. Correction Methods of Calibration Reference Targets RadiometricCharacteristic in High-resolution SAR Systems[J]. Journal of Electronics and Information Technology, 2016, 38(2): 418-424. doi: 10.11999/JEIT150570
Citation: HONG Jun, LEI Dali, WANG Yu, FEI Chunjiao. Correction Methods of Calibration Reference Targets RadiometricCharacteristic in High-resolution SAR Systems[J]. Journal of Electronics and Information Technology, 2016, 38(2): 418-424. doi: 10.11999/JEIT150570

高分辨率SAR定标参考目标辐射特性的校正方法

doi: 10.11999/JEIT150570
基金项目: 

对地观测系统国家科技重大专项(GFZX0403220402, GFZX04032204)

Correction Methods of Calibration Reference Targets RadiometricCharacteristic in High-resolution SAR Systems

Funds: 

National Science and Technology Major Project on Earth Observation System (GFZX0403220402, GFZX04032204)

  • 摘要: 定标参考目标雷达截面积(RCS)的频率、入射角相关性是一个固有性质,对于常规SAR系统,在小带宽/窄方位波束条件下通常近似认为目标具有恒定的后向散射特性,即RCS为一常数;然而,对于高分辨率SAR系统,继续用中心频点、方位角处的RCS表示大信号带宽/宽方位波束条件下的RCS,将会直接影响辐射定标的准确性。鉴于此,该文提出基于标准数据或参考定标体的目标辐射特性校正方法,暗室地基SAR系统仿真结果表明,在目标辐射特性校正前后,点目标积分能量相差1.2 dB;实测数据处理结果显示,经过参考目标辐射特性校正,SAR图像中点目标旁瓣更加对称,且方位向主瓣宽度变窄,在时域更接近理想点目标冲激响应,从而验证了校正算法的有效性。
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  • 被引次数: 0
出版历程
  • 收稿日期:  2015-05-13
  • 修回日期:  2015-11-10
  • 刊出日期:  2016-02-19

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