改进的FMCW信号加权补偿校正相位差法  

Improved phase-difference algorithm with weighted compensation and correction for FMCW signal

作　　者：侯庆文[1] 陈先中[1] 王小攀[1] 尹怡欣[1] 李晓理[1] 

机构地区：[1]北京科技大学信息工程学院钢铁流程先进控制教育部重点实验室,北京100083

出　　处：《仪器仪表学报》2010年第4期721-726,共6页Chinese Journal of Scientific Instrument

基　　金：863项目(2006AA04Z177;2009AA04Z156);北京市教委重点学科控制理论与控制工程(XK100080537);毫米波国家重点实验室(K200801)资助项目

摘　　要：在相位差法的基础上,分析了使用频谱最大值与次大值得到的校正频率结果的内在关系,提出一种改进的加权补偿校正相位差算法,并对校正精度不理想的频段进行了窗函数的改进。仿真结果证明,该算法在测量距离为22.5m,信号信噪比为30dB时,计算结果的平均误差为0.05Hz(0.075mm),均方根误差为0.08Hz(0.12mm),相对误差为0.000532%,本算法运算量平均约为2.5次FFT运算量,能够满足系统实时性的要求。Based on the analysis of traditional phase-difference algorithm and the internal relationship between results from the maximum and secondary spectrum, an improved weighted compensation and correction algorithm is described. The rectangular window function is changed to Hanning window function at some frequency bands with abnormal calibration accuracy. The result of simulation with MATLAB 7.0 indicates that when the measurement distance is 22.5 m and the SNR is 30 dB, the average result error is 0.05 Hz （0. 075 mm） , the root-mean-square （RMS） error is 0.08 Hz （0.12 mm） and the relative error is 0. 000 532%. The average computation task of the proposed algorithm is 2.5 times of FFT computation task, which can meet the real-time requirements for radar measurement system.

关 键 词：FMCW雷达 处理算法 距离测量 相位差 窗函数 

分 类 号：TH772[机械工程—仪器科学与技术]