基于相位测距原理的汽车防撞雷达

Collision avoidance radar for the vehicles based on the theory of phase measurement

文章将相位测距法用于解决汽车安全领域里的物体距离测量,对基于相位测距原理的雷达进行了理论分析。在样机研制过程中,较好地解决了雷达波单边带连续波双频发射和接收问题。基于雷达数据处理的实时性,对雷达信号采用DSP进行采集并作FFT运算,由FFT结果获得信号的相位差和物体的运动速度。实验证明,该雷达理论是可行的,具有一定的实用性。

The theory of phase measurement is applied to determining the object distance in order to guarantee traffic safety. The collision avoidance radar for the vehicles which is based on the theory of phase measurement is analyzed theoretically, and the prototype radar is developed in which the contin- uous wave transmitter and receiver with two frequencies in a single band are designed. The advanced DSP technology and the FFT algorithm are adopted for radar signal sampling and processing in order to meet the need of real-time processing of radar data. The phase difference between two signals and the object speed are obtained based on the FFT data. The experiment results show that the presented method is feasible in both theory and practice.