大气湍流随机相位差的相关解调算法研究

Atmospheric Turbulence Random Phase Difference with the Demodulating Algorithm of Correlation

根据大气光学湍流的光纤干涉测量技术原理及其信号表现形式,针对湍流相位变化的随机性和复杂性,提出了能够实时解调湍流随机相位差的相关解调算法,数值模拟了固定相位差、波形相位差以及符合湍流频谱特征的随机相位差的解调。结果表明,此算法的绝对误差小于10-3,满足湍流测量的要求。该研究为实现光学湍流相位差的动态检测提供了必要的理论方法。

An algorithm for real-time demodulation of random turbulence phase difference is proposed according to the principle and signal expression of fiber optic turbulence measurement system.Fixed,waveform and random turbulence phase difference are all simulated and demodulated to demonstrate the applicability of the algorithm.Result shows that absolute error between demodulated and simulated phase difference is less than 10-3,which satisfies the demand of turbulence measurement.The research provides an important theoretical method to detect the dynamic phase difference of optical turbulence.