Ka-Band Scanning ARM Cloud Radar (KASACR) CF-Radial Spectral Data Vertically-Pointing Scan, High-Resolution Scan, Cross-Polarization Mode - kasacr2cfrspcvpthrcxpol

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 KASACR uses range height indicator, or RHI, scans at numerous azimuths to obtain cloud volume data. Measurements collected with the KASACR are copolar and cross-polar radar reflectivity, Doppler velocity, spectra width and spectra when not scanning, and linear depolarization ratio. \n \nKASACR data from the 2018 2019 Cloud, Aerosol, and Complex Terrain Interactions (CACTI) field campaign in Argentina are now available as b1-level products. Building on the original CACTI operational data, the b1-level products feature improved data quality resulting from extensive analyses and corrections. The data are cross-calibrated to a common point, datastreams are corrected for operational issues that occurred during the campaign, and several data quality masks and basic derived products are incorporated. For more information, read the CACTI radar b1-level processing report.

Ka波段扫描式ARM云雷达（Ka-Band Scanning ARM Cloud Radar, KASACR）可记录云系相关属性。

ARM扫描式云雷达为搭载于统一扫描基座的双频双偏振多普勒雷达。每台扫描基座均配备一台Ka波段雷达（峰值功率2kW），而部署地点将决定第二台雷达为W波段（峰值功率1.7kW）还是X波段雷达（峰值功率20kW）。

Ka波段与W波段配对时的波束宽度大致匹配，约为0.3°；X波段波束宽度则约为1°。由于天线波束宽度较窄，ARM扫描式云雷达采用的扫描策略与常规天气雷达截然不同。相较于常规侧重平面位置显示器（plan position indicator, PPI）扫描的雷达，KASACR会在多个方位角上进行距离高度显示器（range height indicator, RHI）扫描，以此获取云体三维数据。KASACR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、谱宽以及非扫描状态下的频谱，还有线性退极化比。

源自2018至2019年在阿根廷开展的云、气溶胶与复杂地形相互作用（Cloud, Aerosol, and Complex Terrain Interactions, CACTI）野外试验的KASACR数据，现已以b1级产品形式对外发布。b1级产品基于原始CACTI业务数据构建，通过全面的分析与校正流程提升了数据质量：数据已完成跨点交叉定标，针对试验期间出现的业务问题对数据流进行了校正，并集成了多套数据质量掩码与基础衍生产品。如需了解更多细节，请参阅《CACTI雷达b1级处理报告》。