脉冲啁啾干涉绝对距离测量中的时频分析

Time-Frequency Analysis in Absolute Distance Measurement Using Chirped Pulse Interferometry

介绍了飞秒脉冲啁啾干涉测距的原理和典型的时频变换方法,比较了这些方法对啁啾光谱干涉信号分析的影响,研究了影响结果的因素,并将这些方法用于处理啁啾光谱干涉的测距数据。通过实验比对发现,相对于参考的He-Ne干涉仪数据,这些时频变换方法的处理结果在65m范围内的相对精度都优于6×10-7,满足高精度处理要求,其中SPWV(smoothed pseudo Wigner-Ville)分布、连续小波变换(CWT)和SCW(smoothed Choi-Williams)分布处理啁啾光谱数据性能较好,获得了预期的结果。

This paper introduces the principle of chirped femtosecond pulse interference ranging and typical time-frequency analysis methods, and the influences of these methods on the analysis of the chirped spectra interferencesignal are compared. The factors which can affect the results are studied, and these methods are used for processingthe ranging data of chirped spectrum interference. The experiment comparison shows that the relative precisions ofthe time-frequency transform methods are all better than 6 × 10 ^7 in a range up to 65 m, with respect to thereference He-Ne interferometer data, which meets the high-precision processing requirements. Wherein smoothedpseudo Wigner-Ville distribution, continuous wavelet transform and smoothed Choi-Williams distribution performbetter in processing chirped spectral data and get the expected results.