利用闪烁和到达角起伏测量横向风速的对比研究

Comparison of Measurement of Path-Averaged Transverse Wind Speed from Scintillation and Angle-of-Arrival Fluctuations

基于湍流冻结假说,利用时空相关函数分析了使用大气相干长度仪(DIMM)测量横向平均风速的原理,并通过闪烁和到达角起伏测量风速的路径权重函数确定风速传感器的安装位置。在弱湍流条件下,根据水平1 km传输实验测量的到达角起伏和光强起伏数据,分别计算横向风速并与风速传感器同时测量的参考风速对比,发现利用到达角起伏计算的风速与参考风速有一定的相关性。该实验拓展了大气相干长度仪的使用功能。

Based on the frozen-flow hypothesis, the theory of measuring average transverse wind speed was analyzed by using space-time cross correlation function with atmospheric coherence length monitor （DIMM）. The best location of meteorological sensor is determined angle-of-arrival （AOA） fluctnations. Under the weak tur by bul the path-weighted function of scintillation and ence condition, the transverse wind speed was calculated by data of scintillation and AOA fluctuations which was carried out in the experiment of 1 km horizontal propagation path by DIMM. Some results were from the comparison between the transverse wind speed and the wind speed obtained by meteorological sensor. The wind speed obtained by AOA fluctuations has a certain correlation with wind speed acquired by meteorological sensor. The function of DIMM is expanded based on the experiment.