Long-distance laser Doppler water flow velocimetry method based on adaptive Gaussian weighted integration

• DOI: 10.1364/ao.473632
• Publication Date: 2022-09-28T14:00:09Z
• Authors: Yujun Li; Xiangkai Zhao; Jinxin Wang; Xiaoli Xi; Dongmei Li
• Keywords: Velocimetry; Acoustic Doppler velocimetry

Velocity measurement has a high application value in hydrological monitoring and flood disaster warning. The long-distance laser Doppler water flow velocimetry technology the advantage of strong anti-interference ability spatial resolution, it can realize high-precision velocity. Because low reflectance characteristics, how to extract frequency from weak non-stationary coherent signals is crucial problem be solved velocity measurement. However, classical method requires time domain signal have stationarity not suitable for processing Aiming at this problem, we proposed based on adaptive Gaussian weighted integral (AGWI). First, spectral characteristics are analyzed detail, statistical model established. A second-order Kaiser self-multiplication window (KSMW) designed suppress leakage asynchronously sampled data. Then, an homogenization power subtraction (AHPSS) reduce system noise. Finally, spectrum reconstruction estimation performed using AGWI obtain frequency, which further processed get experimental results show that paper achieve accurate stable river surface under conditions.