W-Band Scanning ARM Cloud Radar (W-SACR) Cross-Wind RHI Scan - wsacrcwrhi

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扫描云雷达为全相干双频双偏振多普勒雷达（fully coherent dual-frequency, dual-polarization Doppler radars），集成于统一的扫描转台（common scanning pedestal）之上。每台转台均配备一部Ka波段雷达（峰值功率2kW），而部署场景将决定其二部雷达为W波段扫描云雷达（W-SACR；峰值功率1.7kW）还是X波段扫描云雷达（XSACR；峰值功率20kW）。Ka波段与W波段的波束宽度（beamwidth）大致匹配，约为0.3度。 由于天线波束宽度极窄，ARM扫描云雷达所采用的扫描策略与典型气象雷达存在显著差异。其并未聚焦于平面位置显示（plan position indicator, PPI）扫描模式，其中的Ka波段扫描云雷达（Ka-SACR）会在多个方位角上执行距离高度显示（range height indicator, RHI）扫描，以获取云体三维体积数据。 W-SACR所采集的测量数据包括同极化与交叉极化雷达反射率（copolar and cross-polar radar reflectivity）、多普勒速度（Doppler velocity）、谱宽（spectrum width），以及非扫描状态下的频谱与线性退极化比（linear depolarization ratio）。