Ka-Band Scanning ARM Cloud Radar (KASACR) Along-Wind RHI Scan - kasacrawrhi

The Ka-Band Scanning ARM Cloud Radar (KASACR) records cloud properties. \n \nARM's scanning cloud radars are 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 (1.7 kW peak power) or an X-band (20 kW peak power). \n \nBeamwidths for Ka-bands paired with W-bands are roughly matched at 0.3 degrees. The X-band beamwidth is approximately 1 degree. Due to the narrow antenna beamwidth, ARM s scanning cloud radars use scanning strategies 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. Measurements collected with the Ka-SACR are copolar and cross-polar radar reflectivity, Doppler velocity, spectra width and spectra when not scanning, and linear depolarization ratio.Ka波段扫描ARM云雷达（Ka-Band Scanning ARM Cloud Radar, KASACR）用于记录云系特性。 ARM的扫描型云雷达为双频段、双偏振多普勒雷达，搭载于同一扫描转台。每台转台配备一台Ka波段雷达（峰值功率2kW），根据部署位置的不同，第二台雷达可为W波段（峰值功率1.7kW）或X波段（峰值功率20kW）雷达。 Ka波段与W波段配对时的波束宽度大致匹配，约为0.3°；X波段波束宽度约为1°。由于天线波束宽度极窄，ARM扫描型云雷达采用与常规天气雷达迥异的扫描方案。相较于以平面位置显示器（Plan Position Indicator, PPI）扫描为核心的常规模式，Ka-SACR会在多个方位角上采用距离高度显示器（Range Height Indicator, RHI）扫描，以获取云体三维体积数据。Ka-SACR采集的测量参数包括同偏振与交叉偏振雷达反射率、多普勒速度、谱宽、非扫描状态下的频谱，以及线性退极化比。