摘要线性调频连续波（LFMCW）测距雷达如今已经发展得较为成熟，也有着很多优点，比如不存在距离盲区、截获概率低、距离分辨力高、接收机灵敏度高以及结构简单等优点。这些优点使得LFMCW雷达能在其他体制雷达发展迅速的背景下仍然在雷达大舞台上占有一席之地。75477

本文主要研究LFMCW雷达测距的距离耦合问题和速度模糊问题。首先介绍了LFMCW雷达的基本工作原理，在此基础上以对称三角波调制为主要手段研究了距离速度耦合问题，接着提出了速度模糊问题，介绍了俩种方法去速度模糊，多波形重复频率（WRF）和多普勒频率串（DFC）法。接下来问题由单目标测距转向多目标测距，这是我们工作的重点，本文采用变周期多目标的方法实现多目标情况下的距离速度测定，以这种手段为基础进行了一系列的仿真计算，验证方了法的可行性与可靠性。

毕业论文关键词：  线性调频连续波雷达   距离速度耦合   速度模糊   上下扫频法   多普勒频率串法   变周期多目标法   

毕业设计说明书外文摘要

Title   The Velocity Ambiguity Elimination Method in the Linear Frequency Modulated Continuous Wave Radar                                               

Abstract   Nowadays Linear frequency modulation continuous wave (LFMCW) ranging radar have  grown more mature 。And they have many advantages,such as there is no range blind zone,low probability of intercept,high range resolution,high receiver sensitivity and simple structure,and so on。These advantages make LFMCW radar still have a place in the radar big stage in the background of the rapid development of other radar systems。

   In this paper, we mainly study the range coupling problem and the velocity ambiguity problem of LFMCW radar range finder。 First I introduced the basic principle of LFMCW radar。On the basis of this,we study range-velocity coupling problem with the main means of symmetrical triangle wave modulation。Then I puts forward the velocity ambiguity problems 。and introduces two methods,multi waveform repetition frequency (WRF) and Doppler frequency on (DFC), to eliminate velocity ambiguity。Next we pay attention to multi goal measure,which is the focus of our work。In this paper, we use the method of variable period to realize the distance velocity measurement in multi objective case。Based on this method, a series of simulation calculation is carried out。So we verified the feasibility and reliability of the method。 

 Keywords: LFMCW Radar     range-velocity coupling     velocity ambiguity   method of up and down sweep frequence     Doppler frequency cluster    method of variable period

目   次

1  绪论  1

1。1 LFMCW雷达简介  2

1。2  研究动态   2

1。3  论文内容安排  2

2  LFMCW雷达信号分析   4

2。1  LFMCW雷达工作原理   4

2。2  回波信号分析    5

2。3  距离速度耦合问题以及解决方法  10

  2。4 速度模糊问题以及去速度模糊方法 11 

   2。5 用DFC方法解决速度模糊问题 15

3  变周期多目标LFMCW雷达去速度模糊方法  17

3。1 多目标检测时三角对称波调制的缺陷  17

3。2 解决多目标检测的改进方法   18

3。3 距离速度拟合的标准 26

3。4 变周期多目标的分区算法  27