组合时延估计及人工时延方法用于脉冲相干多普勒测速去模糊

An dealiasing method for pulse-to-pulse coherent Doppler velocimetry using combining time delay estimation and artificial delay

提出了一种改进的脉冲相干多普勒测速的速度模糊消除方法,将待测速度空间以两倍最大可测速度的间隔划分为一系列速度区间,使得对任意速度的测量转化为对速度区间的确定和区间内速度偏移量的测量,通过＂相关-相位＂组合法进行精确时延估计,实现无模糊速度测量;提出＂人工时延＂的方法,消除在速度区间边界值附近可能存在的速度跳变;与传统的速度解模糊方法相比,该方法仅需要对多次人工时延的方案进行计算,无需多次测量,且理论上不受流速范围的限制;通过仿真和实验对该方法的有效性进行了验证。

An improved dealiasing method is proposed to do the cancellation of the velocity ambiguities in the pulseto-pulse coherent Doppler velocimetry. By dividing the velocity space into a series of velocity regions with an interval of two-fold maximum measurable velocity, the measurement of a velocity is turned into the determination of its region and the estimation of its offset velocity in the region. With a combining ＂correlation-phase＂ time delay estimation method, non-ambiguous velocity results are achieved. An artificial time delay method is further proposed to cancel the possible velocity jumping near the boundaries of the velocity regions. Compared with the traditional dealiasing methods, tile proposed one only needs several computations for different artificial delays, instead of taking multiple measurements. And it is not limited by the velocity range theoretically. Simulations and experiments are also conducted to verify the effectiveness of the proposed method.