Ka-Band Scanning ARM Cloud Radar, filtered spectral data, cross-polarized mode - kasacrspeccmaskxpol

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波段扫描型ARM云雷达（Ka-Band Scanning ARM Cloud Radar，KASACR）用于记录云系特性参数。 ARM旗下的扫描型云雷达均为双频段、双偏振多普勒雷达，搭载于统一的扫描转台上。每台扫描转台均配备一台Ka波段雷达（峰值功率2千瓦），配套的第二台雷达型号由部署场地决定，可选用W波段（峰值功率1.7千瓦）或X波段（峰值功率20千瓦）。 Ka波段与W波段搭配时，两者的波束宽度大致匹配，均为0.3度；而X波段的波束宽度约为1度。由于天线波束宽度极窄，ARM的扫描型云雷达采用与常规天气雷达迥异的扫描策略：不再以平面位置显示器（plan position indicator，PPI）扫描为核心工作模式，而是在多个方位角下执行距离高度显示器（range height indicator，RHI）扫描，以获取云体三维数据。Ka-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多普勒谱，以及线性退极化比。