摘要混沌信号是一类具有确定性的类随机信号。超宽带混沌信号作为雷达波形具有良好的距离、速度分辨力，低截获概率和高抗干扰性。本文考虑到超宽带雷达系统研制的实际需要，对超宽带雷达系统中信号的产生、混沌信号的同步、信号延时三个方面进行了研究和探讨。首先，对超宽带混沌信号的产生方法进行了研究，设计出了基于Colpitts振荡器的三级级联超宽带混沌信号产生电路和模数混合电路，PSpice软件仿真结果表明该电路不仅结构简单、易于实现，而且所产生的超宽带混沌信号频谱平坦宽阔；随后对同步电路的原理进行研究，并设计实现两种同步电路，对两路生成信号进行互相关分析。分析结果显示同步效果很好。最后，对混沌信号进行延时，对原信号与延时信号进行互相关分析，分析结果显示延时信号产生变化，原因是驱动电路耦合到响应电路的信号不完全一致。59650

毕业论文关键词  超宽带混沌信号  相关处理  混沌信号同步   混沌信号延时

毕业设计说明书（论文）外文摘要

Title   Research on UWB chaos signal generation and delay      

Abstract

Chaotic signal is a kind of deterministic signal with noise-like characteristics. As radar waveforms, ultra-wideband chaotic signals have good resolution of distance and velocity, low probability of interception, and strong properties of ECCM. Considering the need of a practical radar, the generating of signal, the synchronization of chaotic signal, chaotic signal delay are discussed. First, the simulation of generating circuits of ultra-wideband chaotic signals is carried out, and a new circuit using three cascading Colpitts oscillators for generating ultra-wideband chaotic signal and a analog digital mixing circuit are proposed. With the help of PSpice, the waveform and the frequency spectrum of the above chaotic signal are simulated. Results of the simulation show that a flat and wide frequency spectrum of chaotic signal could be easily generated in this way. Next, study of the principle of synchronous circuit, and designed to realize two synchronous circuit, the two signals of generated for cross-correlation analysis. The results show that he effect of synchronization is good. Finally, the chaotic signal delay. Cross-correlation analysis between the original signal and the delayed signal. The results show a difference between delayed signal and original signal, because the driving circuit is coupled to the response signal of the circuit is not completely consistent. 

Keywords  ultra-wideband chaotic signal, correlation processing, The synchronization of chaotic signal, the delay of chaotic signal

1. 绪论 1

1.1 研究背景 1

1.2 研究现状 1

1.3 主要工作及工作安排 2

2. 超宽带混沌信号的产生 3

2.1 超宽带信号的定义 3

2.2 Colpitts振荡式混沌信号产生电路 4

2.3 模数结合混沌信号产生电路 8

2.4 本章小结 11

3. 混沌信号的同步 12

3.1 常用的混沌系统同步方法 12

3.2 几种混沌系统同步的比较 13

3.3 本章小结 22

4.