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基于相位差测频的调频连续波激光测距技术

Ranging Technology for Frequency Modulated Continuous Wave Laser Based on Phase Difference Frequency Measurement

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摘要

针对调频非线性和快速傅里叶变换(FFT)精度不高的问题,基于等光频间隔重采样的调频连续波测距系统,采用相位差测频法测量了待测目标点的距离;对调频连续波激光测距原理进行分析和推导,并依靠该系统进行了测距稳定性和测距误差的分析实验。结果表明:在8.3~9.3 m测量范围内,相位差测频法的测距单点稳定性范围为50~95 μm,测得的距离与理论距离的残余误差不超过100 μm;所提算法比快速傅里叶变换具有更好的测距精确性和稳定性。

Abstract

In view of the problems that the sampling nonlinearity and the low accuracy of the Fourier transform, a frequency estimation based on phase difference method to measure the distance of the target point is used based on the ranging system of frequency modulated continuous wave, which is based on the equispaced-phase resampling. The principle is analyzed and deduced. The stability of distance measurement and the error of distance measurement are analyzed based on the system. The research results show that the residual error of the measured distance with phase difference frequency measurement and the theoretical distance is not more than 100 μm and the stability of the single point range is between 50-95 μm in the range of 8.3-9.3 m. Compared with the fast Fourier transform, phase difference frequency measurement has better accuracy and stability in ranging.

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中图分类号:TH741;TN247

DOI:10.3788/cjl201845.1104002

所属栏目:测量与计量

基金项目:国家自然科学基金(51675380)、航天一院高校联合创新基金

收稿日期:2018-05-10

修改稿日期:2018-05-30

网络出版日期:2018-06-06

作者单位    点击查看

吉宁可:天津大学精密测试技术及仪器国家重点实验室, 天津 300072
张福民:天津大学精密测试技术及仪器国家重点实验室, 天津 300072
曲兴华:天津大学精密测试技术及仪器国家重点实验室, 天津 300072
张桐:天津大学精密测试技术及仪器国家重点实验室, 天津 300072
张铁犁:北京航天计量测试技术研究所, 北京 100076
刘晓旭:北京航天计量测试技术研究所, 北京 100076
谢阳:北京航天计量测试技术研究所, 北京 100076

联系人作者:张福民(zhangfumin@tju.edu.cn); 吉宁可(tjulink520@tju.edu.cn);

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引用该论文

Ji Ningke,Zhang Fumin,Qu Xinghua,Zhang Tong,Zhang Tieli,Liu Xiaoxu,Xie Yang. Ranging Technology for Frequency Modulated Continuous Wave Laser Based on Phase Difference Frequency Measurement[J]. Chinese Journal of Lasers, 2018, 45(11): 1104002

吉宁可,张福民,曲兴华,张桐,张铁犁,刘晓旭,谢阳. 基于相位差测频的调频连续波激光测距技术[J]. 中国激光, 2018, 45(11): 1104002

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