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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。
The principle of the chirped interferometric distance measurement of femtosecond pulse and the typical time-frequency transformation methods are introduced. The influence of these methods on the analysis of chirped spectrum interference signals is compared. The factors that affect the result are studied. And these methods are used to deal with chirp Spectral interference ranging data. The experimental comparison shows that the relative accuracy of these time-frequency transform methods is better than 6 × 10-7 within 65m relative to the reference He-Ne interferometer, which meets the requirements of high precision processing. Among them, SPWV ( smoothed pseudo Wigner-Ville distribution, continuous wavelet transform (CWT) and smoothed choi-Williams (SCW) distribution were used to process the chirped spectral data. The expected results were obtained.