宽带LFM信号分析及其Stretch处理研究

摘要线性调频脉冲信号是一种典型的大时宽带宽积雷达信号，具有较高的距离分辨率、较强的抗干扰能力、高的目标检测和识别能力，在雷达领域中被广泛应用。本论文对宽带线性调频信号进行分析，研究其性能和处理过程。43211

本论文首先介绍了线性调频信号的时域频域性能及模糊函数特性，给出了模糊图，分析了其模糊函数切割特性；然后阐明了宽带线性调频信号的stretch处理流程，并分析了影响数字脉压的因素；接着研究了提高测距精度的方法，以补零法、Chirp-Z法和双线性对称内插法为例，给出了算法原理和仿真；最后研究了速度对一维距离像的影响，并对运动目标速度进行补偿，仿真结果表明了方法的有效性。

关键词线性调频脉冲信号 Stretch处理模糊函数测距精度速度补偿

毕业论文设计说明书外文摘要

Title LFMCW Signal Analysis and the stretch processing of LFMCW

Abstract

LFM signal is a typical large time-bandwidth product of the radar signal, with high range resolution, strong anti-jamming capability, high target detection and identification capability, is widely used in the field of radar. In this paper, the properties and processing of LFM is introduced .

Firstly, the properties of LFM signal in time domain and frequency domain, the ambiguity function of LFM, the properties of cut ambiguity function is introduced. Secondly, the stretch processing of LFM is deduced, and the factors affecting the digital pulse pressure is studied. Then, the method of improving the accuracy of range accuracy is introduced, for example, zero padding method, Chirp-Z method and symmetric bilinear interpolation method. At the same time, Their algorithm principle and simulation is given. Lastly, the affect of speed on one-dimensional distance image and the speed compensation of moving target is studied. simulation results show the effectiveness of the this method.

Keywords LFM Ambiguity function Stretch Processing Range accuracy Speed- compensation

1 绪论 1

1.1 国内外研究背景与意义 1

1.2 国内外研究现状 1

1.3 本论文主要工作与安排 2

2 线性调频信号性能分析 4

2.1 LFM的基本特性 4

2.1.1 LFM的时域特性 4

2.1.2 LFM的频域特性 5

2.2 LFM信号的模糊函数 7

2.2.1 LFM信号的模糊函数的推导 7

2.2.2 LFM的频域特性 7

2.2.3 LFM信号的模糊函数的切割 9

3 宽带LFM信号的stretch处理 12

3.1 stretch处理原理框图 12

3.2 stretch处理公式推导 12

3.3 影响数字脉压的因素 13

4 提高测距精度的方法 15

4.1 补零法 15

4.2 Chirp-z法 16

4.3 双线性对称内插法 17

5 速度对一维距离像的影响及补偿宽带LFM信号分析及其Stretch处理研究:http://www.751com.cn/tongxin/lunwen_43935.html