全光纤位移干涉测速系统中小波基的选取研究

摘要

In order to make the all-fiber displacement interferometer system for any relector ( AFDISAR) operate accurately and stably, based on wavelet analysis, the AFDISAR signal was analyzed theoretically and then six types of wavelet base functions were selected for computer simulation, and finally the optimal wavelet base appropriate for AFDISAR signal analysis was decided. At the same time, the accuracy of 99% and high stability of the system were verified in the free-fall motion experiment and the high-speed detonation experiment respectively. The results indicate that the selection of optimal wavelet base function is reasonable.%为了使全光纤位移干涉测速系统能够准确稳定地测速,采用小波基分析问题的方法,对全光纤位移干涉测速仪信号进行了理论分析,并选取6种小波基函数进行计算机模拟,选定了适合全光纤位移干涉测速仪信号分析方法的最优小波基.与此同时,分别利用自由落体运动实验和高速爆轰实验验证了系统的精确性和稳定性,精确度达到99％,稳定性极高.结果表明,最优小波基的选取是合理的.