LFM正交调制的FDA-MIMO雷达运动目标检测  

FDA-MIMO Radar Moving Target Detection with LFM Orthogonal Modulation

作　　者：林洋 张顺生[1] 王文钦 桂荣华 Lin Yang;Zhang Shunsheng;Wang Wenqin;Gui Ronghua(Research Institute of Electronic Science and Technology,University of Electronic Science and Technology of China,Chengdu,Sichuan 611731,China;School of Information and Communication Engineering,University of Electronic Science and Technology of China,Chengdu,Sichuan 611731,China)

机构地区：[1]电子科技大学电子科学技术研究院,四川成都611731 [2]电子科技大学信息与通信工程学院,四川成都611731

出　　处：《信号处理》2019年第11期1888-1894,共7页Journal of Signal Processing

摘　　要：频控阵(FDA)雷达的提出引起了广泛关注,而应用FDA对运动的微弱目标进行检测是目前来说研究相对较少。针对FDA模型下的运动目标跨距离单元走动下的检测,存在波束时变以及回波脉压结果受频偏影响很大等问题,其中波束时变是指FDA发射波束随时间变化,这使得后续匹配滤波后信号峰值错位,同时对于多发单收体制,频偏对脉压结果影响很大,当频偏大于一定范围时,脉压结果出现多峰值,使得检测完全失效。本文提出利用keystone变换与频控阵-多输入多输出(FDA-MIMO)结合的技术处理该问题。理论及仿真结果证明,FDA-MIMO模型与keystone变换结合可以解决时变性影响并很好地处理运动目标探测中距离徙动问题,提高微弱低可观测目标的检测概率。The proposal of frequency diversity array radar has attracted much attention, while using FDA to detect weak targets of movement is relatively rare. For the detection of moving target moving across the range unit under the FDA model, there are some problems such as beam time variation and echo pulse pressure which are greatly affected by frequency offset. Where beam time-varying refers to the FDA transmitting beam changing with time, which makes the subsequent matched filtered signal peak dislocation, at the same time, frequency offset has a great influence on pulse pressure results in the system of multiple sending and single receiving, when frequency offset is greater than a certain range, pulse pressure results show multiple peaks, making the detection completely invalid. This paper proposes to use keystone transform and FDA-MIMO technology to deal with this problem. The theoretical and simulation results prove that FDA-MIMO model combined with keystone transformation can solve the time-varying effect, effectively deal with the range migration of moving target detection, and improve the detection probability of weak and low observable targets.

关 键 词：FDA-MIMO模型 运动目标检测 距离徙动 keystone算法 

分 类 号：TN958[电子电信—信号与信息处理]