摘要合成孔径雷达(Synthetic Aperture Radar, SAR)由于其与实孔径雷达相比较有高分 辨率的显著特点,在遥感领域有愈来愈广泛的应用。本文主要研究了合成孔径雷达的距离 多普勒成像算法(Range Doppler Algorithm, RDA) 和线性调频变标成像算法(Chirp Scaling Algorithm, CSA)。首先介绍了 SAR 基本原理和相关术语，建立 SAR 回波信号模 型。基于 Matlab 仿真分析了线性调频(Linear Frequency Modulation, LFM)信号性质及 脉冲压缩原理，进而阐述了 SAR 信号性质和 SAR 回波信号二维成像处理的基本理论。最 后着重分析了 RD(Range Doppler)算法和 CS(Chirp Scaling)算法，结合点目标仿真结果 阐明了距离单元徙动（Range Cell Migration, RCM）的影响及其校正，阐述了“空变” 现象及其解决，同时对 CS 算法中的线性变标操作进行了分析。78929

毕业论文关键词 合成孔径雷达 脉冲压缩 RD 算法 CS 算法 Matlab

毕 业 设 计 说 明 书 外 文 摘 要

Title Synthetic Aperture Radar (SAR) Imaging Technology Research

Abstract Synthetic aperture radar is more and more frequently used in remote sensing filed due to its huge advantage of high resolution compared with real aperture radar。 Range doppler imaging algorithm(RDA) and Chirp scaling imaging algorithm(CSA) in synthetic aperture radar (SAR) are studied in this paper。 Firstly, the fundamental theory and related terms are introduced, and the basic model of SAR’s echo signal is established。 Based on Matlab simulation, the character of Linear Frequency Modulation (LFM) signal and the theory of pulse compression are analyzed。 Then the nature of SAR signal and the basic principle of SAR’s echo signal imaging processing in two dimensions are expounded。 Finally, the paper lays emphasis on RD and CS algorithm, demonstrates the impact and correction of Range Cell Migration, and illuminates the phenomenon of space-variant and the solution to it through the simulation result of point target。 The chirp scaling operation in CS algorithm is analyzed as well。

Keywords Synthetic  Aperture Radar imaging RD  algorithm CS  algorithm simulation

本科毕业设计说明书 第 I 页

目 次

1 绪论 1

1。1 研究背景及意义 1

1。2 国内外研究现状 1

1。3 本文主要研究内容及结构 2

2  SAR 原理 3

2。1 SAR 成像基本原理与合成孔径概念 3

2。2 SAR 观测场景几何 4

2。3 SAR 回波信号模型 5

2。4 线性调频脉冲信号的脉冲压缩 7

2。5 小结 20

3 SAR 信号频谱 21

3。1 低斜视角情况的近似分析 21

3。2 一般情况下的精确推导