【作者】 周飞；

【导师】 宋耀良；

【作者基本信息】 南京理工大学 ， 通信与信息系统， 2004， 硕士

【摘要】 宽带混沌信号因其随机性和良好的相关特性，是通讯或雷达应用的一种理想的信号。但迄今为止，宽带混沌信号的产生和相关处理都非常困难，限制了其在系统中的应用。本文首先对宽带混沌信号产生方法作了分析和仿真，提出了一种数字混沌序列驱动的宽带混沌信号产生方法，仿真分析结果证实了该方法不仅电路结构简单、易于实现，而且所产生频谱平坦宽阔；接着，对典型的宽带混沌信号的频谱、相关特性和模糊特性的作了分析比较，结果表明数字混沌序列驱动的宽带混沌信号具有优异的测距、测速和ECCM性能；在此基础上，本文结合实际应用，对参数失配和零状态相异情况下的宽带混沌信号的同步进行了讨论和仿真，结果显示数字混沌序列驱动的宽带混沌信号不仅能够实现同步，并具有一定的Robust特性，可以方便实现信号的延迟，从而解决了宽带混沌信号在系统应用时难以实现的相关处理问题。最后，对数字混沌序列驱动的宽带混沌信号在雷达系统中的应用作了初步的系统设计。更多还原

【Abstract】 Wideband chaotic signal is an ideal signal in communication and radar system for its noise-like behavior and good autocorrelation performance. However, the application of wideband chaotic signal is limited owing to the difficulty of its generating and correlation processing. First, the simulation of generation circuits of wideband chaotic signals is carried out, and a new method for generating wideband chaotic signal inspired by digital chaotic sequence is proposed. Results of simulation show that a flat and wide frequency spectrum of chaotic signal could be easily generated in some ways. Next, the frequency spectrum, correlation and ambiguity characteristics of typical wideband chaotic signals are analyzed and compared by means of Matlab. It is confirmed that the wideband chaotic signal inspired by digital chaotic sequence has excellent resolution of distance and velocity, and strong properties of ECCM. After that, the synchronization of the wideband chaotic signals is analyzed and also simulated by PSpice, and the results demonstrated the wideband chaotic signal inspired by digital chaotic sequence can be synchronized and the synchronization is of robust. Thus, the delay of wideband chaotic signal can be easily realized and the correlation processing is possible to implement now. Finally, the basic design of radar system using the wideband chaotic signal is carried out.更多还原