LFMCW雷达密集运动目标检测

DENSE-MOVING TARGET DETECTION OF LFMCW RADAR

线性调频连续波雷达对于匀速运动目标的回波经过混频以后还是一个线性调频信号 (LFM).从LFM信号中提取密集运动目标的距离和速度参数是个比较复杂的问题.本文提出了一种基于目标运动补偿和逐次消去(“CLEAN”)技术相结合的检测方法,该方法避免了估计多分量LFM信号参数问题,同时又消除了多普勒效应对密集运动目标检测的各种影响.仿真结果表明该方法不但克服了LFMCW雷达在密集目标检测中的困难,而且比传统方法降低 10dB左右的检测信噪比门限.

The received signal from target of linear frequency-modulated continues wave (LFMCW) radar is a linear frequency-modulated (LFM) signal. It is a complex problem to obtain the velocity and range of the target by estimating the parameters of LFM signal. A novel method was pressented to detect the dense-moving target based on motion compensation and 'CLEAN' technique. The method avoids estimating the parameters of LFM and eliminates the different effects produced by Doppler Effect. Simulation illustrates that the proposed method can not only overcome the difficult in dense-moving target detection but also reduce 10dB detection threshold.