双基地MIMO雷达杂波背景下的弱目标检测

发布时间：2018-01-13 23:23

  本文关键词：双基地MIMO雷达杂波背景下的弱目标检测　出处：《电子科技大学》2015年硕士论文　论文类型：学位论文

  更多相关文章： 双基地MIMO雷达 杂波建模 恒虚警 目标检测 CLEAN算法

【摘要】：电子战技术飞速发展,传统单基地雷达和双基地相控阵雷达已很难满足现代战场复杂环境的需求,双基地MIMO雷达结合双/多基地雷达布阵方式和集中式MIMO雷达的优势,各发射通道发射信号彼此正交,具有更好的弱目标检测、抗低空突防、抗干扰以及射频隐身性能,展示出更优良的性能和发展潜力。然而正是由于正交波形的使用,双基地MIMO雷达基本原理的研究和性能的分析方面和现有雷达体制存在很大差异,尤其是杂波建模和杂波背景下的弱目标检测问题,更趋复杂。本文针对双基地MIMO雷达的基本特点,提出了高效准确的杂波模拟方法,推导了CA-CFAR以及OS-CFAR两种恒虚警检测在瑞利杂波背景下的检测概率,分析了步进频分线性调频(SFDLFM)信号的旁瓣问题,并与相控阵雷达的弱目标检测能力进行了对比。具体工作内容包括以下几点:1、介绍了双基地MIMO雷达目标检测基本架构和信号处理流程;介绍了CA-CFAR和OS-CFAR两种恒虚警检测方法。2、给出了满足发射角度分辨率、接收角度分辨率、距离分辨率的杂波单元划分方法以及杂波散射系数和幅度起伏模拟方法,提出了采用杂波单元划分预存储的方法提高杂波模拟效率,通过仿真验证了其有效性。3、讨论了CA-CFAR和OS-CFAR在考虑和不考虑目标RCS起伏的情况下的检测概率,推导了双基地MIMO雷达信号处理后的信杂比输出,由此得到了两种恒虚警检测下的检测概率,并通过仿真进行了验证;分析了SFDLFM信号的旁瓣问题;对比了MTI和CLEAN算法两种杂波抑制算法对慢速目标的检测能力;仿真对比了旁瓣干扰下,CA-CFAR和OS-CFAR对临近的强弱两目标的检测性能。4、通过仿真和理论推导,对比了双基地MIMO雷达和相控阵雷达在动态范围、弱目标检测能力、距离分辨力、抗距离欺骗干扰方面的性能,体现了双基地MIMO雷达的弱目标检测的优势和发展潜力。
[Abstract]:With the rapid development of electronic warfare technology, the traditional mono-static radar and bistatic phased array radar have been difficult to meet the needs of modern battlefield complex environment. Bistatic MIMO radar combines the advantages of bistatic / multistatic radar array mode and centralized MIMO radar, each transmitting channel signal is orthogonal to each other, which has better weak target detection and anti-low altitude penetration. Anti-jamming and RF stealth performance show better performance and development potential. However, it is precisely because of the use of orthogonal waveforms. The basic principle and performance analysis of bistatic MIMO radar are very different from the existing radar systems, especially the modeling of clutter and weak target detection in clutter background. According to the basic characteristics of bistatic MIMO radar, an efficient and accurate clutter simulation method is proposed in this paper. The detection probability of CA-CFAR and OS-CFAR CFAR detection in Rayleigh clutter background is deduced, and the sidelobe problem of stepped frequency division linear frequency modulation (SFDL FM) signal is analyzed. And compared with the weak target detection ability of phased array radar. The specific work includes the following points: 1, introduces the basic structure and signal processing flow of bistatic MIMO radar target detection; In this paper, two CFAR detection methods, CA-CFAR and OS-CFAR, are introduced, and the transmission angle resolution and the receiving angle resolution are given. The clutter unit partition method and the clutter scattering coefficient and amplitude fluctuation simulation method are proposed to improve the clutter simulation efficiency. The effectiveness of the method is verified by simulation. The detection probability of CA-CFAR and OS-CFAR is discussed under the condition of considering or not considering the fluctuation of target RCS. The signal-to-clutter ratio output of bistatic MIMO radar signal processing is deduced, and the detection probability under two kinds of CFAR detection is obtained and verified by simulation. The sidelobe problem of SFDLFM signal is analyzed. The detection ability of MTI and CLEAN clutter suppression algorithms for slow targets is compared. The detection performance of CA-CFAR and OS-CFAR for adjacent targets under sidelobe interference is compared by simulation and theoretical derivation. The performances of bistatic MIMO radar and phased array radar in dynamic range, weak target detection ability, range resolution and range deception jamming are compared. The advantages and potential of weak target detection of bistatic MIMO radar are demonstrated.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN957.51
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本文编号：1421025