基于小波包+FFT的FMCW雷达测距算法研究

Research on range-finding algorithm of FMCW radar based on wavelet packet+FFT

针对在货运火车对接过程中对距离测量的精确性和实时性的要求,提出小波包＋FFT的FMCW雷达测距算法,实现了火车对接系统的高精度实时测距。首先在Matlab上进行仿真实验,对应距离段选取合适的小波包函数和节点,利用运算能力强大的DSP芯片实现小波包的分解与重构,然后使用4 096点的FFT算出目标对应的距离信息。在火车对接雷达测距系统的实验平台上进行多次重复实验,实验结果表明,在0.5~10 m范围内,测距精度达到0.2 m,在10~50 m范围内,测距精度达到0.3 m。

For the accuracy and real？time performance requirements of distance measurement in connection process of the freight trains, the range？finding algorithm of FMCW radar based on wavelet packet＋FFT is proposed to achieve high precision and real？time range？finding of train connection system. This simulation experiments was were proceeded with Matlab. The appro？priate wavelet packet functions and nodes corresponding to the distance sections were selected. The decomposition and recon？struction of wavelet packet were achieved by adopting DSP chip with powerful calculation ability. Then the distance information corresponding to the target was calculated by using FFT with 4096？point. Several The repeated experiments were conducted on the experiment platform of radar range？finding system for train connection, and the experimental results show that the range？finding ac？curacy can reach 0.2 m within the range of 0.5~10 m, and the range？finding accuracy can achieve 0.3 m within the range of 10~50 m.