基于时间反转的非均匀线列阵超指向性阵元分布模型  

Super-Directional Element Distribution Model of NLA Based on TR

作　　者：杨伏洲[1] 王海燕[1] 申晓红[1] 荆海霞[1] 

机构地区：[1]西北工业大学航海学院,西安710072

出　　处：《上海交通大学学报》2013年第12期1907-1910,1917,共5页Journal of Shanghai Jiaotong University

基　　金：西北工业大学基础研究基金项目(NPU-FFR-JC201004);国防基础预研项目(B2720110003)

摘　　要：以目标信号为前提,建立了基于时间反转(TR)的非均匀线列阵(NLA)的设计模型;采用均匀浅海多径信道的经典射线理论,以直达路径信号分量的时延为参考因子,推导了NLA的TR聚焦性能及方向图的影响因子.仿真结果表明,基于TR的NLA设计通过TR自适应修正多径信道传输时延的特性,不但克服了多径信道对目标方位估计(DOA)的影响,且提高了低信噪比下的DOA准确性,其方向图特性F(θ)与信号频带、阵列排布di、多径数目M以及快拍数K有关.基于7阵元分布的NLA方向图仿真结果相比均匀阵列具有超指向性,且在信噪比-6和-13dB下均准确估计出目标方位.The establishment of a designed model was discussed based on time reversal（TR） of non-uni- formed linear array（NLA） as a precondition of the target signal. By using the multi-path channel classic ray theory under symmetrical shallow water environment, and adopting the line of sight signal components as a reference factor, the impact factor of NLA＇s TR focusing performance and directional diagram was de- rived. The conclusion shows that the designed model not only overcomes multi-path channel influence, but improves direction of arrival（DOA） accuracy under low signal-to-noise, based on TR adaptive correction characteristics of multi-path propagation delay, while the directional diagram F（O） is related to bandwidth, arrayed factor di, multi-path M and snapshots K. The simulation results show that directional diagram of 7 elements distribution NLA has super-directivity compared to uniformed linear array via TR, and accu- rately estimates the target orientation under both --6 dB and --13 dB signal-to-noise condition.

关 键 词：时间反转 非均匀线列阵 目标方位估计 多径信道 超指向性 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构]