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%。

For improving the accuracy of the parameters, when utilizing laser Doppler effect to measure the parameters of the object, a novel approach of analyzing nonstationary signal was proposed, the system equation was deduced through the gradient search method, the stability of the system by the Poincaré map theory was studied. The transverse displacement measurement of object at distance of 50 m was accomplished using this approach in the detecting signal of laser Doppler effect, laser Doppler shift was estimated. The experiments show that the relative error is within 0.7%.