基于回波信号的环视SAR成像运动参数估计

发布时间：2018-11-27 11:07

【摘要】：环视合成孔径雷达(Circular-scanning SAR)主要用于在导弹精确末制导中进行景象匹配,而雷达的运动参数是实现精确制导的关键因素之一。运动参数可以由GPS和IMU直接测得,也可以通过从实测数据中估计得出。由于环扫SAR雷达平台具有运动速度快、非匀速运动和大斜视等特点,因此对多普勒参数估计精度要求比较高。而由现有GPS和IMU测得的雷达运动参数由于具有较大误差一般很难满足成像精度要求,因此本文将两者结合针对实际雷达和运动情况,对运动参数作了精确估计和运动补偿,以适应环扫SAR高分辨率成像和精确制导的要求。仿真数据处理的结果表明,该方法能准确地实现上述参数估计,从而显著提高了环视SAR系统输出图像的质量。实测数据则证明了该方法具有很强的实用性。
[Abstract]:Encircling synthetic Aperture Radar (Circular-scanning SAR) is mainly used for scene matching in missile precision terminal guidance, and radar motion parameter is one of the key factors to achieve precision guidance. The motion parameters can be directly measured by GPS and IMU, or can be estimated from measured data. Because of the high speed, non-uniform motion and large squint, the accuracy of Doppler parameter estimation is very high. However, the radar motion parameters measured by GPS and IMU are difficult to meet the requirements of imaging accuracy because of their large errors. Therefore, in this paper, the motion parameters are estimated and compensated accurately according to the actual radar and motion conditions. In order to meet the high resolution imaging and precision guidance requirements of ring sweep SAR. The results of simulation data processing show that the proposed method can accurately estimate the above parameters and thus improve the quality of the output image of the SAR system. The measured data show that the method is very practical.
【作者单位】：南京航空航天大学电子信息工程学院;
【基金】：国家自然科学基金(61301210,61301212,61201459)资助项目中国博士后科学基金(2012M511750)资助项目教育部博士点基金(20123218120021)资助项目江苏省自然科学基金(BK20130815)资助项目
【分类号】：TN957.52

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