915-MHz Radar Wind Profiler/RASS (RWP915): wind moments - 915rwpwindmom

\n \nThe radar wind profiler/radio acoustic sounding system (RWP/RASS), available in 915-MHz (for U.S. deployments) and 1290-MHz (for foreign deployments), measures wind profiles and backscattered signal strength between (nominally) 0.1 km and 5 km and virtual temperature profiles between 0.1 km and 2.5 km. However, ARM no longer operates the RASS portion. \n \nThe RWP transmits electromagnetic energy into the atmosphere in as many as five directions (four tilted in opposing vertical planes and on vertical) and measures the strength and frequency of backscattered energy. Calculation of the Doppler shift of the returned signal allows calculation of the atmospheric wind profile.雷达风廓线仪/无线电声探测系统（Radar Wind Profiler/Radio Acoustic Sounding System, RWP/RASS）分为适配美国部署场景的915兆赫兹版本，与适配海外部署场景的1290兆赫兹版本。该系统可在标称0.1千米至5千米的区间内测量风廓线与后向散射信号强度，并可在0.1千米至2.5千米的区间内获取虚温廓线。不过，大气辐射测量项目（Atmospheric Radiation Measurement, ARM）已停止运营其RASS子系统。 RWP可向大气发射最多五个方向的电磁能量（其中四个分别在两个对立垂直平面内倾斜，另一个沿垂直方向布设），并测量后向散射能量的强度与频率。通过对返回信号的多普勒频移进行计算，即可推演出大气风廓线。