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

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)

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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

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

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。
- 高分辨率SAR系统 /
- 辐射定标 /
- 雷达截面积 /
- 参考目标辐射特性校正 /
- 地基SAR系统
Abstract: The calibration reference point targets Radar Cross Section (RCS) is a inherent property depending on frequency and incidence angle, for traditional SAR systems, which can be approximately regarded as a constant under the condition of narrowband and narrow beam. However, for high-resolution SAR systems, replacing the RCS in the case of wideband and wide beam by the RCS of central frequency and azimuth aspect, will result in an inaccurate radiometric calibration output. In this paper, correction methods of reference point targets in the echo domain or in the complex image domain are presented. From the experimental result of simulation and ground-based SAR, it can be seen that the absolute calibration factor varies over 1.2 dB before and after the reference point target correction. The results of real data show that point targets in the SAR image are more symmetric after correction of reference targets radiometric characteristic, and the main lobe in azimuth becomes narrower, which is more close to ideal point target impulse response in time domain, thus validating the effectiveness of the correction algorithm.
- High-resolution SAR systems /
- Radiometric calibration /
- Radar Cross Section (RCS) /
- Correction of reference targets radiometric characteristic /
- Ground-based SAR system

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参考文献(27)

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