随着汽车用量的增长，汽车防撞雷达对提高交通安全性有着极其晕要的现实意义，而传统的线性调频连续波雷达体制中存在着严重的多用户同频电磁干扰问题。由于宽带混沌信号具有良好的相关特性，文中提出了数字处理方式的宽带混沌调频连续波雷达，采用混沌调频信号来代替传统的线性调频信号的方案，结果显示它很好地解决丁加性高斯白噪声干扰和多用户间的交叉干扰问题；系统利用了离散混沌序列驱动连续混沌系统产生宽带混沌信号的方法，其电路结构简单，所得频谱平坦宽阔，在汽车防撞雷达和其他雷达、通信系统中具有很好的应用前景。

With the increasing number of automobiles, it is very important to use the vehicle collision warning radar in the traffic systems. However, there are serious crosstalks between multi-users for the conventional LFMCW radar systems. Thanks to the ideal cross-correlation function of the chaotic wideband signals, a wideband chaotic FMCW radar concept with digital processing is introduced in this paper, in which the chaotic FM signal is used to replace the conventional signals of LFMCW radar. The results show that it can well solve the problems of AWGN and the crosstalks between multi-users. The continuous chaotic circuits driven by the discrete chaotic sequences are easy to implement and can obtain the wideband chaotic signals. The concept has a good prospect in vehicle collision avoidance radar systems and many communication systems.

TN957.51

国家教委留学回国人员基金资助项目（编号KZ06001）