内容介绍

原文档由会员 违规屏蔽12 发布

摘 要

雷达利用电磁波来探测目标，而雷达侦察系统通过截获敌方雷达所发射的信号，对其进行分析和处理来向雷达干扰设备系统情报信息。

无线通信系统具有多径衰落的现象，这会使信道的稳定性变差，如果采用MIMO技术，在无线通信系统的两端分别采用多个天线同时发送和接收信号，就能够克服多径衰落，进而改变无线通信的质量。MIMO雷达是MIMO技术在雷达领域中的推广，具有优异的性能，通过分集技术在低截获概率、目标参数估计、发射波束设计、杂波抑制、目标成像等领域的性能要优于传统雷达。另一方面，MIMO雷达也给未来电子战提出了新的挑战，为了适应未来电子战的发展，需要研制新型的雷达侦察设备。

本文介绍了目前MIMO雷达的分类，分析了MIMO雷达的基本原理和信号处理流程，对MIMO雷达的方向图作了仿真，介绍了MIMO雷达所采用的正交信号模型，重点分析了正交线性调频矩形脉冲的设计，对所设计的信号作了多种情况的仿真，还对MIMO雷达的性能作了分析。

文中研究了对MIMO雷达进行侦察的设备，介绍了传统雷达侦察接收机的体制及特点，即超外差接收机、瞬时测频接收机、信道化接收机和数字接收机，分析了这些传统接收机对MIMO雷达适用性，文中根据MIMO雷达的特点提出了混合式雷达侦察接收机，分析了其基本组成和特点，然后，讨论了对MIMO雷达应当采取的侦察策略。

为了验证MIMO雷达的存在，本文对MIMO雷达的信号识别作了研究，分析了常规的雷达信号分选方法，探讨了常规信号分选方法对MIMO雷达信号的适用性，由于MIMO雷达同时发射多个相互正交的信号，因此接收机侦收到的信号是同时到达的混合信号，因此本文采用了奇异值分解和盲信号处理的方法，它能够对MIMO雷达信号进行有效的侦察识别，文中设计了对信号侦察识别的仿真界面，通过MATLAB的仿真验证了算法的有效性，根据信号之间的相关性判断了MIMO雷达的存在。

关键词　MIMO雷达　侦察　识别　信号分选　相关性

Abstract

Radar detects object using electromagnetic wave. Radar reconnaissance system intercepts signals from enemy radar and analyzes and processes it, then provides information for radar interfering equipment.

Wireless communication system has the phenomenon of multipath fading. It weakens stability of channel. If adopting MIMO techniques, wireless communication system send and receive simultaneously using many antennas, then can overcome multipath fading and improve communication quality. As a promotion of MIMO techniques in the field of radar, MIMO radar has excellent performance. Diversity enables the MIMO radar much more superior than standard radar in several aspects, including: LPI, parameter estimation, transmit beampattern design, clutter suppression and target imaging. On the other hand, MIMO radar brings new challenge to EW in the future. In order to adapt development of EW (Electronic Warfare), we need start to study the new radar reconnaissance equipment.

This article introduces the types of MIMO radar, analyzes the principles and signal processing of MIMO radar, and simulates the beampattern of MIMO radar. The orthogonal signal models that MIMO radar adopts are introduced. OFDM LFM signal is emphasized and simulated in many cases. And performance of MIMO radar is analyzed.

The equipment for reconnoitering MIMO radar is studied. This article introduces systems and characteristics of traditional reconnaissance equipment for radar, including: super heterodyne receivers, instantaneous frequency measurement receivers, channelized receivers and digital receivers. Based on analysis on adaptability of traditional receivers, the article brings forward the hybrid receivers and analyzes its basic units and characteristic. Then strategy of reconnoitering MIMO radar is presented in the paper.

For verifying the existence of MIMO radar, this paper studies how to identify the signals of MIMO radar, traditional methods of signal sorting and its adaptability for MIMO radar signals. Because MIMO radar can transmit multiple probing signals synchronously, the receivers receives the signal that is mixed. So the method of decomposing singular values and blind signal processing which can identify the signals of MIMO radar is adopted. The interface of simulation is designed and the arithmetic is verified effective by MATLAB. The existence of MIMO radar can be estimated by pertinence among signals.

Keywords MIMO Radar reconnaissance Identification Signal Sorting Correlation

目 录

摘 要I

AbstractIII

第1章 绪论1

1.1　研究背景及意义1

1.2　MIMO雷达的研究分类4

1.3　MIMO雷达的研究动态5

1.4　论文结构及安排7

第2章　MIMO雷达基本原理及信号处理9

2.1　MIMO雷达的基本原理9

2.2 匹配滤波器11

2.3 数字多波束形成13

2.4　MIMO雷达的信号模型16

2.4.1 OFDM LFM信号16

2.4.2 正交多相编码信号24

2.4.3 正交离散频率编码信号25

2.5 MIMO雷达的性能分析26

2.6 本章小结27

第3章　对MIMO雷达侦察设备的研究29

3.1 雷达侦察的主要任务29

3.2 雷达侦察面临的信..