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针对多普勒非对称空间外差干涉技术,提出一种目标信号相位自校正的方法.首先通过连续采样单色光的干涉图跟踪绝对相位漂移;然后分段线性拟合不同风速下的干涉相位,通过计算两条拟合曲线距离去除相位漂移.搭建风速模拟实验平台,获得采样干涉图,并对相位误差进行校正.结果表明,在60.37m/s的模拟风速下,相位漂移误差达到30.78m/s,通过相位校正风速反演误差降低至3.51m/s,风速精度得到较大改善.最终通过几组不同风速下的反演值得到了平均2.97m/s的风速测量精度.
Aiming at the Doppler asymmetric heterodyne interference technique, a method of self-correcting target signal phase is proposed. First, the absolute phase shift is tracked by the interference pattern of continuously sampled monochromatic light. Then, the interferometric phases at different wind speeds are piecewise linearly fitted , The phase shift was calculated by calculating the distance between the two fitting curves.The wind speed simulation experiment platform was set up to obtain the sampling interference map and the phase error was corrected.The results showed that the phase drift error reached 30.78m at simulated wind speed of 60.37m / / s, the error of wind speed inversion reduced to 3.51m / s by phase correction, and the accuracy of wind speed was greatly improved.At last, wind speed measurement accuracy of 2.97m / s was obtained by several sets of inversion values under different wind speeds.