一种车载毫米波列车防撞雷达系统研究

摘要

Collision avoidance radar for trains is a prime device for transportation safety. To realize low cost and high performance in terms of azimuth accuracy, we developed MMW (Milli-Meter Wave) radar, which employs a switched phased array and frequency-stepped technology. In this study, we analyze the radiation patterns of transmitting/receiving antennas and a compensation method for the amplitude/phase errors of synthetic wideband frequency-stepped signals. To confirm the operation of the radar, low-cost MMW collision avoidance radar was fabricated. The experiments confirmed a high azimuth and range resolution.%　　列车防撞雷达是保障铁路行车安全的一种重要设备，该文针对列车防撞应用需求中的低成本实现目标方位角度高精度测量难题，采用了基于开关切换的数字阵列天线和频率步进高分辨波形设计方法，分析了收发天线的天线方向图和频率步进合成宽带信号幅相误差补偿问题，并构建了一种低成本车载毫米波防撞雷达系统，进行了原理样机外场实验。实验结果表明该样机系统达到了较高的距离分辨率和角度测量精度，可有效分辨铁轨内外目标。