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线性调频信号检测、分离和参数估计
姓名:陈晓
申请学位级别:硕士
专业:电路与系统
指导教师:严国萍
20080602
华中科技大学硕士学位论文
摘要
在现代电子战场中,常常会出现复杂的混叠雷达信号,高质量的分辨这些信号
成为在当代电子战中把握先机、获取胜利的重要因素之一。由此,分析战场雷达信
号,特别是线性调频信号,并对其进行检测、分离和参数估计具有十分重要的意义。
本文基于联合时频分析方法,对雷达信号中的线性调频信号进行了检测、分离
和参数估计研究。介绍了战场中常见的雷达信号特别是线性调频脉冲压缩信号的雷
达信号模型,阐述了联合时频分析的相关理论,并对短时傅立叶变换,Wigner-Ville
分布,小波变换,Wigner-Hough 变换的主要方法、特征、适用范围做出了详尽的介绍,
同时论述了基于联合时频分布方法的信号检测和参数估计的常见思路以及主要算
法。
本文的主要工作是对雷达信号中常见的线性调频信号进行识别,即信号检测和
参数估计。由于 Wigner-Hough 变换相对于常用的检测方法 Wigner-Ville 分布而言,有
更好的分辨检测性能,故文中采用 Wigner-Hough 变换对线性调频信号进行检测。文章
分别采用基于小波的特征尺度模极大值法和基于短时傅立叶变换的极大似然估计法
对线性调频信号进行参数估计,对算法进行了 Matlab 仿真和性能分析,并将两种算
法的优劣进行了比较分析。

关键词:线性调频信号; 小波变换; 短时傅立叶变换; 检测; 参数估计
I
华中科技大学硕士学位论文
Abstract
In modern electronic battlefield, complex mixed signals usually emerge. How to
recognize these signals accurately is an important task in modern electronic battles.
Therefore it is considerably significant to analyze, detect, separate and estimate the radar
signals.
This paper is mainly based on joint time-frequency analysis. It detects, separates and
estimates the linear FM signals of radar. Several kinds of radar signal models such as
common linear FM pressed signals, two-phase code pressed signals
and frequency pressed signals are introduced. Then the basic knowledge of joint
time-frequency analysis is demonstrated, such as Short-time Fourier transform,
Wigner-Ville distribution and Wavelet transform. Main method, feature and suitable range
of Wavelet transform are also introduced. Common idea and algorithm of signal detection
and blind signal separation are then demonstrated. The algorithm and simulation of
parameter estimation of linear FM signals are demonstrated.
This paper mainly identifies linear FM signals, also called detection, parameter
estimation. Wigner-Hough Distribution is used to detect the linear FM signals .An
algorithm based on Wavelet transform and an algorithm based on Short-time Fou