基于局部搜索OMP的网格失配STAP算法  

Off-grid STAP algorithm based on local search orthogonal matching pursuit

作　　者：李志汇 张永顺[1,2] 高乾 郭艺夺 王强[1] 刘洋[1] LI Zhihui 1, ZHANG Yongshun 1,2 , GAO Qian 3, GUO Yiduo 1, WANG Qiang 1, LIU Yang 1(1. Air and Missile Defense College, Air Force Engineering University, Xi’an 710051, China;2. Collaborative Innovation Center of Information Sensing and Understanding, Xi’an 710077, China3. Air Force Communication NCO Academy, Dalian 116600, Chin)

机构地区：[1]空军工程大学防空反导学院,陕西西安710051 [2]信息感知技术协同创新中心,陕西西安710077 [3]空军通信士官学校,辽宁大连116600

出　　处：《系统工程与电子技术》2018年第6期1221-1226,共6页Systems Engineering and Electronics

基　　金：国家自然科学基金(61501501)资助课题

摘　　要：针对稀疏恢复空时自适应处理(space-time adaptive processing,STAP)存在网格失配时,造成稀疏恢复STAP的性能下降这一问题,提出一种基于局部搜索正交匹配追踪算法。该算法首先从全局STAP完备字典中选择与杂波相匹配的全局网格点;然后以选出的全局网格点为中心,以全局完备STAP字典的空时频率间隔为区域,构建局部STAP字典,并从中选择与杂波最匹配的局部网格点;最后得到杂波的角度-多普勒像和修正的STAP字典。仿真结果表明,所提的算法能够选择与真实杂波脊相匹配的网格点,从而提高了稀疏恢复STAP技术的性能。Focusing on the performance degradation of sparse recovery space-time adaptive processing（SRSTAP）due to the presence of off-grid,a local search orthogonal matching pursuit algorithm is proposed.In the proposed algorithm,the global grid point which is matched with clutter is first selected from the global STAP overcomplete dictionary.Then the local STAP overcomplete dictionary is designed,whose center is the above selected global grid point and the size of which is the spatial and temporal frequency intervals.By selecting the local grid point which is matched with the clutter ridge from the local STAP dictionary,the angle-Doppler profile of clutter and the modified STAP dictionary are obtained.Simulation results demonstrate that,the proposed algorithms can select the grid point more matched with the clutter ridge,and significantly improve the performance of SR-STAP.

关 键 词：空时自适应处理 稀疏恢复 网格失配 局部搜索 正交匹配追踪 

分 类 号：TN957.52[电子电信—信号与信息处理]