基于Matlab的多頻率FMICW的信號分離及時延信息提取

電子機電論文編號:JD201      字數:9843,頁數:31        

目錄
摘要 .........................................................................I
Abstract.................................................................... II
第一章緒論 ..................................................................1
1.1研究背景 ..................................................................1
1.2研究意義及方法.............................................................1
1.3論文的內容 ................................................................1
第二章理論基礎...............................................................2
2.1離散傅立葉變換 ............................................................2
2.2數字濾波器.................................................................3
2.3帶通采樣理論...............................................................4
2.3.1窄帶中頻采樣數字化 ......................................................5
2.3.2寬帶中頻采樣數字化 ......................................................6
2.3.3射頻直接帶通采樣定理 ....................................................6
2.4數字信號正交變換理論.......................................................7
2.4.1窄帶信號的正交與模擬域實現 ..............................................8
2.4.2數字混頻正交變換.........................................................9
第三章系統的實現原理.........................................................11
3.1 FMICW信號及參數設置.......................................................11
3.2信號的分離.................................................................14
3.3時延信息的提取.............................................................15
3.4使用實信號分析題目.........................................................16
第四章應用Matlab對系統仿真 ..................................................17
4.1信號分離 ..................................................................17
4.2時延提取.................................................................. 20
結論 .........................................................................21
致謝......................................................................... 22
參考文獻..................................................................... 23
附錄 .........................................................................24

摘要
雷達的作用主要是通過對回波信號的分析檢測遠處的目標，由于回波信號中含有許多其它的成分，需要對回波信號進行處理，以便分離出有用信號，然后在這些分離出來的信號中分析得到有用的信息。
本文主要研究兩個問題，一個是把混疊在一起的多路不同頻率的調頻中斷連續波信號（FMICW）分離出來，另一個是從所分離出來的信號中提取出時延信息。解決第一個問題主要是使接收到的信號通過正交分解、濾波等處理，把各路信號分離出來，通過對已分離出的信號進行傅立葉變換等處理，并最終提取出時延信息。在分析解決這兩個問題的過程中，數字信號處理起到了基礎作用，而軟件無線電的思想為解決問題提供了有效的方法。最后，再應用Matlab進行仿真。
關鍵詞：調頻中斷連續波，正交變換，傅利葉變換

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