摘要随着雷达技术的发展，无线电引信定距技术已经日趋成熟,其中,连续波伪随机码调相定距体制已成为引信工作体制中重要的发展方向之一。其抗干扰能力正成为研究的焦点，电磁环境适应性作为抗干扰的一个重要的指标，如今正成为衡量连续波伪随机码调相探测抗干扰性重要一环。63596

本文论述了伪随机码调相体制定距系统的工作原理，讨论了伪随机码序列的产生、信号的调制与解调及相关检测等原理并进行仿真。通过数学的表达方式模拟了电磁环境，模拟了几种不同的干扰信号，应用matlab/simulink仿真软件，在不同的干扰信号作用下，仿真信号处理全过程，对信号进行分析，为工程应用中的干扰信号处理提供参考。

毕业论文关键词  伪随机码  伪码调相技术  电磁干扰  matlab/simulink 

毕业设计说明书（论文）外文摘要

Title    Study on Suitability of PRCPM in Electromagnetic environment                                                   

Abstract With the development of radar technology, radio fuze fixed pitch technology has Increasingly improved, wherein the pseudo-random code phase modulation continuous wave fixed pitch system has become an important system now. Its anti-jamming capability is becoming the focus , environmental adaptability  is an important indicator in electromagnetic interference, and now is an important part in the measure of the pseudo-random code phase modulation continuous wave detection system .

This paper discusses the theory of how pseudo-random code phase modulation  system works,and shows the pseudo-random code sequence generation, signal modulation and demodulation and related testing and simulation. This paper simulate the electromagnetic environment through mathematical expressions , also simulate several different interference signals . By using Matlab / Simulink simulation software, under the action of several interfering signal, this paper simulate the whole process of signal processing , providing great reference for engineering applications of the interference signal processing .

Keywords  PRCPM  BPSK  Electromagnetic environment  matlab/simulink

绪论 1

1.1  研究背景 1

1.2  研究意义 3

1.3  研究内容 3

1.4  结构组织框架 3

2  伪随机码调相探测系统工作原理 4

2.1  m序列伪随机码的产生及其特性 4

2.2  伪随机码调相技术 6

2.3  伪随机码调相系统定距原理 8

2.4  阈值的设定 11

3  伪随机码调相探测系统仿真设计 12

3.1  simulink简介 12

3.2  伪随机码探测系统的缩比模型 13

3.3  仿真框图及仿真结果 14

4  伪随机码调相探测系统电磁环境适应性仿真与分析 15

4.1  噪声调幅信号 15

4.2  单频率正弦信号 18

4.3  特定波形调幅信号 20

4.4  噪声调频信号