毫米波雷达液位计高精度测距算法研究  

A Study on High Accuracy Range Measurement Algorithm for MMW Radar Level Meter

作　　者：王元恺[1] 孙伟[2] 许建中[1] 

机构地区：[1]南京理工大学电子工程与光电技术学院,江苏南京210094 [2]山东省经济和信息化委员会,山东济南250000

出　　处：《测试技术学报》2015年第6期529-533,共5页Journal of Test and Measurement Technology

基　　金：江苏省研究生科研创新计划资助项目(KYLX_0364)

摘　　要：本文基于毫米波FMCW雷达液位计测距原理,针对影响测距精度的FFT栅栏效应问题,提出了将Zoom FFT和能量重心校正算法结合的高精度信号处理算法.该算法通过FFT算法锁定感兴趣的差频信号频谱范围,采用Zoom FFT在此范围内进行频谱细化,后利用能量重心校正算法对细化后的频谱进行频率校正,从而获得差频信号的精确频率信息,并通过换算得到雷达到液面的距离.仿真结果表明,该算法能将雷达液位计的测距精度提高到毫米量级,计算量和运算存储空间比较合理.This paper is based on the range measurement principle of the millimeter wave FMCW radar liquid level meter.To solve the FFT picket fence problem which affects the range measurement precision,high accuracy signal processing algorithm,which combines Zoom FFT with the correcting method about the center of gravity for energy,is proposed in this paper.In this algorithm,FFT is firstly applied to estimate the beat signal spectrum region of interest,and then Zoom FFT is used to zoom the resulting spectrum region.Finally,the method is utilized to obtain the precise frequency information,with which the distance between radar and liquid surface can be calculated.Simulation results illustrate that the proposed algorithm can improve the range measurement precision of radar level meter to the millimeter level,with reasonable computational load and memory space.

关 键 词：FMCW雷达 液位计 测距 ZOOM FFT 能量重心校正 

分 类 号：TJ810.6[兵器科学与技术—武器系统与运用工程]