基于Matlab的多频率FMICW的信号分离及时延信息提取

电子机电论文编号:JD201      字数:9843,页数:31        

目录
摘要 .........................................................................I
Abstract.................................................................... II
第一章绪论 ..................................................................1
1.1研究背景 ..................................................................1
1.2研究意义及方法.............................................................1
1.3论文的内容 ................................................................1
第二章理论基础...............................................................2
2.1离散傅立叶变换 ............................................................2
2.2数字滤波器.................................................................3
2.3带通采样理论...............................................................4
2.3.1窄带中频采样数字化 ......................................................5
2.3.2宽带中频采样数字化 ......................................................6
2.3.3射频直接带通采样定理 ....................................................6
2.4数字信号正交变换理论.......................................................7
2.4.1窄带信号的正交与模拟域实现 ..............................................8
2.4.2数字混频正交变换.........................................................9
第三章系统的实现原理.........................................................11
3.1 FMICW信号及参数设置.......................................................11
3.2信号的分离.................................................................14
3.3时延信息的提取.............................................................15
3.4使用实信号分析题目.........................................................16
第四章应用Matlab对系统仿真 ..................................................17
4.1信号分离 ..................................................................17
4.2时延提取.................................................................. 20
结论 .........................................................................21
致谢......................................................................... 22
参考文献..................................................................... 23
附录 .........................................................................24

摘要
雷达的作用主要是通过对回波信号的分析检测远处的目标，由于回波信号中含有许多其它的成分，需要对回波信号进行处理，以便分离出有用信号，然后在这些分离出来的信号中分析得到有用的信息。
本文主要研究两个问题，一个是把混叠在一起的多路不同频率的调频中断连续波信号（FMICW）分离出来，另一个是从所分离出来的信号中提取出时延信息。解决第一个问题主要是使接收到的信号通过正交分解、滤波等处理，把各路信号分离出来，通过对已分离出的信号进行傅立叶变换等处理，并最终提取出时延信息。在分析解决这两个问题的过程中，数字信号处理起到了基础作用，而软件无线电的思想为解决问题提供了有效的方法。最后，再应用Matlab进行仿真。
关键词：调频中断连续波，正交变换，傅利叶变换

Abstract
The main function of Radar is detect the target of remote through analyse the signal of returning. We need process the the signal of returning because of it containing lots of the other signal.Then we can separate the useful signal and the useful information.
This article include two main problem,the one is that separating the signal of FMICW which mix with many different frequenzes,the other is that geting the information of time delay from the signal separated.When we solve the first problem,we process the signal with the measure of  quadrature transforming and filter, and then we separate the signal. Then we make the signal separated Fourier Transform, and we can get the information of time delay from the frequency spectrum.When we analyzing and solving the problems ,Digtial signal process is the base,and the idea of SR is the measure of solving problem.At last ,we can simulate with the tool of Matlab.
Key words: FMICW(Frequency Modulated Interrupted Continuous Wave),quadrature transform， Fourier Transform