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为了提高激光多普勒测量固体运动参数的精度,提出了一种新型的非平稳信号分析方法,在算法中应用梯度下降方法推导出算法的系统方程,并且通过庞加莱映射给出系统稳定的存在条件。将该方法应用到激光多普勒测量50 m处固体面内位移的信号检测中,对多普勒信号进行处理,估计多普勒频移。测试结果表明,该方法能够准确检测激光多普勒信号,测出数据的相对误差小于0.7%。
In order to improve the accuracy of laser Doppler measurement of solid motion parameters, a new non-stationary signal analysis method is proposed. The system equations of the algorithm are deduced by using the gradient descent method in the algorithm, and the stability of the system is given by Poincaré mapping There are conditions. The method is applied to the signal detection of solid surface displacement at 50 m laser Doppler, and the Doppler signal is processed to estimate the Doppler frequency shift. The test results show that this method can accurately detect the laser Doppler signal, and the relative error of the measured data is less than 0.7%.