W-Band Scanning ARM Cloud Radar (WSACR) Corner Reflector Raster Scan - wsacrcrraster

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扫描云雷达为搭载于统一扫描基座的全相干双频双极化多普勒雷达。每个基座配备一台Ka波段雷达（峰值功率2千瓦），部署地点决定了第二台雷达为W波段扫描云雷达（WSACR，峰值功率1.7千瓦）或X波段扫描云雷达（XSACR，峰值功率20千瓦）。Ka波段与W波段的波束宽度大致匹配，均为0.3度。 由于天线波束宽度极窄，ARM扫描云雷达采用与常规天气雷达迥异的扫描策略。Ka波段扫描云雷达（Ka-SACR）并未采用平面位置显示器（Plan Position Indicator, PPI）扫描模式，而是通过多方位角的距离高度显示器（Range Height Indicator, RHI）扫描来获取云体三维数据。 W波段扫描云雷达（W-SACR）采集的观测数据包括同极化与交叉极化雷达反射率、多普勒速度、多普勒谱宽，以及非扫描状态下的频谱与线性退极化比。