线性调频脉冲激励下旋转对称体目标回波模拟与分析

摘要线性调频信号是波形最容易产生的一种信号，其脉冲压缩的形状和信噪比对多普勒频移不敏感，在雷达信号的脉冲压缩处理等方面有着广泛应用。
在目标电磁散射特性计算的数值算法中，频域方法已经得到很大的发展和有效应用，其准确性和速度得到各领域的肯定。但是频域方法在计算线性调频信号等宽频带信号、冲激脉冲信号等瞬时信号激励下的目标电磁散射特性时，其性能尚显不足，而时域方法可以直接计算时域信号激励下目标电磁散射特性，并且可以实时的记录目标表面电磁特性随激励信号变化的过程，非常适合计算宽频带信号的时域回波。9172
本课题要采用线性调频信号作为激励信号,用频域矩量法和时域积分方程方法，完成对旋转对称体目标产生的回波信号进行仿真计算。
关键词线性调频信号旋转对称体矩量法时域积分方程法散射场毕业设计说明书（论文）外文摘要
Title Simulation and analysis of the echo signal of the
        rotating symmetric body excited by the linear frequency
        modulated pulse signal
Abstract
Linear frequency modulation signal is one of the most convenient signal to get. The shape and signal to noise ratio of its pulse compression isn't sensitive to Doppler Shift.It plays an important role in radar signal compression.
In the field of electromagnetic scattering calculations, the frequency domain methods have been greatly developed and been proved to be very effective .Its accuracy and speed is recognized in various fields. But in the calculation of the linear FM signal, such as broadband signals, impulse pulse signal and transient signal incentive target electromagnetic scattering characteristics, the performance of the frequency domain method is still less effective than the time-domain method ,which can directly calculate electromagnetic scattering under the excitation of time-domain signal , and it can record the electromagnetic properties of the target surface with the excitation signal change in real time.It is very suitable for calculating the time-domain echo of the broadband signal.
   We choose a linear FM signal as excitation signal, using the frequency domain method of moments and time domain integral equation method,to perform the simulation of the echo signal generated by the goal of rotating symmetric body.
Keyword: linear FM signal rotating symmetric body method of moment time domain integral equation scattered field
目   次

1 绪论   1
1.1 论文的相关背景介绍   1
1.1.1 雷达应用背景   1
1.1.2 电磁散射计算方法   1
1.2 论文的主要工作   2
2 旋转对称体介绍   2
3 线性调频(LFM)信号   4
3.1 时域—带宽积的概念   4
3.2 线性调频信号的频谱   4
3.2.1 线性调频函数表达式   4
3.2.2 线性调频信号的幅度谱   5
3.2.3 线性调频信号的相位谱   6
4 频域矩量法   7
4.1 矩量法的过程简介   7
4.2 频域旋转对称矩量法   8
4.2.1 混合场积分方程   8
4.2.2 基函数的选择   9
4.2.3 测试函数的选择   11
4.2.4 积分方程的矩阵化   11
4.2.5 散射场表达式   13
4.3 由点频计算延伸到宽频信号   14 线性调频脉冲激励下旋转对称体目标回波模拟与分析:http://www.751com.cn/tongxin/lunwen_7801.html