文档介绍：华中科技大学
硕士学位论文
基于联合时频分析的战场复杂信号的检测、分离与识别
姓名:张博
申请学位级别:硕士
专业:通信与信息系统
指导教师:严国萍
20090501
华中科技大学硕士学位论文
摘要
跳频信号、线性调频信号等是在现代复杂战场环境下经常使用的信号,在通信
对抗中,他们的自动分离与识别技术有重大的理论意义和实际应用价值。
本文通过建立一个信号检测系统来实现上述信号的分离、识别与参数提取,该
系统包括信号建模、混合调制,接收预处理以及对各种信号的识别与参数提取模块。
本文主要对该系统进行总体介绍,并着重介绍接收端信号接收预处理模块以及其算
法仿真。
在系统级方面,分别介绍了系统模型,各部分(包括信号建模,混合调制,发
射端,信道,接受端,处理器等)功能及其实现。基于 MATLAB 平台进行建模与仿
真。
在接收预处理方面,介绍了接收信号预处理的基本步奏:信源数目估计、DOA
估计和波束形成技术。其中,信源数目估计采用了基于 Gerschorin 盘理论的算法
——GDE 算法,DOA 估计采用经典的 MUSIC 算法,波束形成采用了性能优越的线
性约束最小均方差算法。源信号使用两个线性调频信号和两个跳频信号,基于线性
均匀天线阵,对接收信号混合阵进行了理论分析和算法仿真。

关键词信号检测系统;Gerschorin 盘理论;DOA;波束形成算法
I
华中科技大学硕士学位论文
ABSTRACT
Frequency hopping signals, such as linear frequency modulated signal plex in
the modern battlefield environment signals used munication confrontation, their
separation and automatic recognition technology have significant theoretical and practical
application values.
In this paper, through the establishment of a signal detection system to achieve the
signal separation identification and parameter extraction, the system includes signal
modeling, mixed modulation, to accept a variety of signal pre-processing, as well as the
identification modules. This paper introduced the system, and especially introduced to
accept pre-processing module and the simulation of algorithms.
At the system level, the system model introduced, the various parts’(including the
signal modeling, mixed modulation, transmitter, channel, the receiving end, processor, etc.)
functions and its realization. MATLAB-based modeling and simulation platform.
At the preprocessing module, basic step-by-step pretreatment on received signals are
introduced: the theory of the number of source estimation,DOA estimation and
beamforming them, the theory of the number of source estimation
used GDE algorithm based on plate Gerschorin, DOA estimation used classic MUSIC
algorithm and the beamforming technology brought line