摘要
各种类型的角反射器是SAR辐射定标常用参考目标,其辐射特性在高分辨率应用时将不再保持恒定。本文分析了高分辨率SAR系统中宽频带对常用参考目标RCS的调制效应及其对辐射定标中能量提取的影响,在此基础上提出了针对这类参考目标的辐射特性校正方法,补偿了调制效应。通过仿真量化了调制效应对能量提取算法的影响,并利用校正算法对地基SAR实验数据处理,验证了该方法的有效性。
All kinds of reflectors are widely used in SAR radiometric calibration.These references targets characters become non-const when applying in wideband high-resolution SAR system applications.In this paper how frequency modulation of reference targets affects the radiometric calibration procedure is analyzed.Further more a method to correct the inconsistency caused by the effect is introduced so that traditional calibration algorithm can be easily applied without big changes.Simulation is carried on to give quantitative results by the frequency modulation.A test-bed SAR experiment is carried on and related data is processed with calibration algorithms to validate the method.
出处
《国外电子测量技术》
2010年第4期32-36,共5页
Foreign Electronic Measurement Technology
