超宽带汽车防撞雷达的设计

Design of Ultra Wide-band Automobile Anti-collision Radar

将超宽带技术引入汽车防撞雷达领域。介绍了超宽带汽车防撞雷达对发射信号的要求,给出完整的系统框图和说明,介绍了通过PCI7300A数据采集卡对AD转换后的回波信号进行实时采集,并对采集到的数据进行时域处理的具体过程。重点提出了利用回波位置进行目标识别,以及利用3根接收天线来测角的新方法。针对汽车防撞的使用环境,只对存在相对运动的目标进行检测,从而降低了信号处理的难度,提高了图像的刷新率。

The UWB （Ultra Wide-band） technique is introduced into the Anti-collision radar. The requirement to UWB transmission signal is presented first, followed with a whole system block diagram and detailed explanation. Then, the PCI7300 A card is used to acquire the radar echoes, and the signal is processed in time domain, focused on targets identification and false targets elimination. Because of the specific environment for car anti-collision, only moving target is detected, which decreases the difficulty for signal processing and improves the update rate for imaging.