W-Band ARM Scanning Cloud Radar (WSACR); CF-Radial Hemispherical Sky RHI Scan - wsacr2cfrhsrhi

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扫描式云雷达是搭载于统一扫描基座的全相干双频双极化多普勒雷达。每套基座均集成一台Ka波段雷达（峰值功率2kW），部署位置将决定配套的第二部雷达为W波段（WSACR；峰值功率1.7kW）还是X波段（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°。

由于天线波束宽度极窄，ARM扫描式云雷达采用的扫描策略与常规天气雷达存在显著差异。Ka波段扫描云雷达（Ka-SACR）并未聚焦于平面位置显示器（plan position indicator, PPI）扫描模式，而是通过在多个方位角上执行距离高度显示器（range height indicator, RHI）扫描，以获取云体三维体积数据。

W-SACR采集的测量数据涵盖同极化与交叉极化雷达反射率、多普勒速度、谱宽、非扫描工况下的频谱，以及线性退极化比。