【作者】 吴庆天；

【导师】 赵国庆；

【作者基本信息】 西安电子科技大学 ， 电路与系统， 2009， 硕士

【摘要】 目前雷达系统由于受多径和遮挡现象影响,对低空/超低空目标难以探测,其生存受到反辐射导弹攻击、电磁干扰以及隐身目标等问题的威胁。受MIMO通信思想的启发,近年提出了MIMO雷达的概念,期望通过收/发多天线配置、空间多通道并行传输在雷达领域获得突破,以解决雷达目前面临的一系列问题。MIMO雷达的出现也给现代电子对抗带来了新的挑战。本文介绍了MIMO雷达的基本原理、结构分类、信号模型、正交发射信号形成、接收端信号处理等技术。其中重点对接收端信号处理流程进行了系统分析;研究了MIMO雷达不同于普通相阵控雷达的数字多波束形成技术;对其目标识别能力、抗干扰等性能进行了详细分析,指出MIMO雷达在提高目标检测性能、参数估计精度、目标分辨率、抗干扰等方面较传统雷达有明显优点;同时结合现代侦察技术,研究了对MIMO雷达侦察识别的方法。针对MIMO雷达分集体制的特点,分析了应采用的侦察识别手段,论述了对MIMO雷达基于多信号时、空、频相关性的识别原则,并进行了相关的仿真分析,验证了识别方案的可行性;最后在侦察识别的基础上研究了对MIMO雷达的干扰技术,指出干扰效果的评估准则和相关干扰应具有的特点。更多还原

【Abstract】 At present, there are many problems in traditional radar system. For example, low altitude targets or super low altitude targets are difficulty to be detected for multiple paths and shelter phenomenon, the attacking of anti-radiation missile, electromagnetism jamming and stealth targets. In order to cope with these challenges, the new concept of MIMO (multiple-input multiple-output) radar is proposed, which makes multi-antenna configuration and uses space multi-channel parallel transmission. MIMO radar also brings new challenges to the domain of ECM.Firstly, the principles of MIMO radar are presented in this paper, including the structure, classification, signal model, orthogonal waveform and signal processing system. Secondly, with MIMO radar signal processing analysis, the sequel DBF technology and mutil-target detection capability of MIMO radar are investigated. Thirdly, the MIMO radar reconnissionce and identification technology are discussed. A method of making correlation analysis based on time\space\frequency for multiple signals is proposed. Simulation results in the computer are carried out to demonstrate the effectiveness of the proposal. Finally, the electronic jamming methods of MIMO radar are investigated. The evaluation criterion of jamming effects is also presented.更多还原