W-Band ARM Scanning Cloud Radar (WSACR); CF-Radial Cross-Wind RHI Scan - wsacr2cfrcwrhi

ARM's scanning cloud radars are fully coherent dual-frequency, dual-polarization Doppler radars mounted on a common scanning pedestal. Each pedestal includes a Ka-band radar (2kW peak power) and the deployment location determines whether the second radar is a W-band (WSACR; 1.7 kW peak power) or X-band (XSACR; 20 kW peak power). Beamwidths at Ka and W bands are roughly matched at 0.3 degrees. \n \nDue to the narrow antenna beamwidth, ARM s scanning cloud radars use scanning strategies that are unlike typical weather radars. Rather than focusing on plan position indicator, or PPI, scans, the Ka-SACR uses range height indicator, or RHI, scans at numerous azimuths to obtain cloud volume data. \n \nMeasurements collected with the W-SACR are copolar and cross-polar radar reflectivity, Doppler velocity, spectra width and spectra when not scanning, and linear depolarization ration.ARM扫描云雷达（scanning cloud radars）为搭载于统一扫描基座的全相干双频双偏振多普勒雷达（fully coherent dual-frequency, dual-polarization Doppler radars）。每套基座均配备一台Ka波段（Ka-band）雷达（峰值功率2kW），部署位置决定了配套的第二部雷达类型：若为W波段（W-band）雷达，则该系统称为WSACR（峰值功率1.7kW）；若为X波段（X-band）雷达，则称为XSACR（峰值功率20kW）。Ka波段与W波段的波束宽度大致匹配，均约为0.3度。 得益于极窄的天线波束宽度，ARM扫描云雷达采用的扫描策略与常规天气雷达截然不同。Ka波段扫描云雷达（Ka-SACR）并未以平面位置指示（plan position indicator, or PPI）扫描为核心扫描模式，而是通过在多个方位角执行距离高度指示（range height indicator, or RHI）扫描，以获取云体三维体积数据。 W波段扫描云雷达（W-SACR）采集的测量参数包括：同极化与交叉极化雷达反射率、多普勒速度、非扫描状态下的谱宽与频谱，以及线性退极化比（linear depolarization ratio）。