基于样本加权的三通道SAR-GMTI机载数据处理及性能分析  

Airborne Data Processing and Performance Analysis Based on Three-Aperture SAR-GMTI System Using Weighted Sample

作　　者：曾操[1] 廖桂生[1] 杨志伟[1] 刘聪锋[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071

出　　处：《电子学报》2009年第3期506-512,共7页Acta Electronica Sinica

基　　金：国家自然科学基金资助项目(No.60736009)

摘　　要：针对机载三通道雷达系统的杂波抑制问题,提出基于样本加权估计杂波相关矩阵的三通道联合动目标检测方法.基于广义内积值对像素矢量样本加权,三通道联合杂波抑制后检测出动目标位置,局部两两干涉实现动目标重定位和测速,最后进行了性能分析.所提方法无需设置样本选取门限,对图像配准精度仅要求在1个像素以内,样本加权后改善因子提高明显;3幅图像联合处理的性能优于2幅图像处理.机载实测数据处理结果验证了方法的有效性和稳健性.A robust method for estimating the covariance matrix using the weighted pixels vector for the joint clutter rejection is proposed. Firstly, the pixels vector is weighted based on the value of the generalized inner product. Secondly, the locations of the ground moving targets are detected using the map of joint clutter rejection with three SAR images. Thirdly, the true locations and velocities of the targets can be obtained by the local interferometric method. Finally, the performance analysis is given. Without the threshold of the sample select and only one pixel image registration being required, the improved factor with the weighted processing is much higher than that with the unweighted processing and the improved factor of the jointed processing is better than that of the paired processing. The effectiveness and robustness of the proposed method are verified with the results of the measured airborne data.

关 键 词：地面动目标检测 杂波抑制 样本选取 三通道合成孔径雷达 

分 类 号：TN957[电子电信—信号与信息处理]