一种补偿时变姿态的Whitt极化定标改进算法  

Improved Time-variant Attitude Compensating Whitt Polarimetric Calibration Algorithm

作　　者：刘云龙 梁兴东[1,2] 李焱磊[1,2] 周良将[1,2] 

机构地区：[1]中国科学院电子学研究所,北京100190 [2]微波成像技术国家级重点实验室,北京100190 [3]中国科学院大学,北京100049

出　　处：《电子与信息学报》2017年第10期2354-2359,共6页Journal of Electronics & Information Technology

基　　金：国家863计划项目(2013AA092105)~~

摘　　要：极化定标是目标检测、分类识别和定量反演等实际应用的重要前提。载机平台的姿态变化会引起极化指向角的变化,从而降低极化定标精度。针对这一问题前人已提出了基于Whitt算法的改进算法。该文详细分析了这些改进算法存在的问题,并在此基础上提出了一种考虑通道不平衡的逐脉冲补偿时变姿态的极化定标算法,能够有效地抑制姿态变化对极化定标的影响。仿真实验和实测数据处理验证了该算法的有效性。Polarization calibration is an important prerequisite for practical application such as target detection, classification recognition and quantitative inversion. The attitude variance of carrier platform can cause variance of polarization orientation angle, thus reducing the polarization calibration precision. Improved algorithms based on Whitt algorithm is proposed for this problem. In this paper, the problem of these improved algorithms is analyzed in detail, and on this basis, a polarimatric calibration algorithm, which takes channel unbalance into consider and compensates the time-varying attitude pulse by pulse, is proposed, and it can effectively suppress the influence of attitude change on polarization calibration. Simulation results and experimental data processing verify the effectiveness of the proposed algorithm.

关 键 词：机载SAR 极化定标 姿态变化 极化指向角 极化失真矩阵 

分 类 号：TN957.52[电子电信—信号与信息处理]