Ka-Band Scanning ARM Cloud Radar (KASACR) RHI scans, which can vary in elevation range and azimuth - kasacrrhi

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波段扫描型ARM云雷达（Ka-Band Scanning ARM Cloud Radar，KASACR）用于采集云系属性数据。

ARM旗下的扫描型云雷达均为双频双极化多普勒雷达，搭载于统一的扫描转台之上。每个转台均配备一台Ka波段雷达（峰值功率2千瓦），而第二台雷达的波段则取决于部署点位：可为W波段雷达（峰值功率1.7千瓦），或X波段雷达（峰值功率20千瓦）。

Ka波段与W波段搭配时的波束宽度大致匹配，约为0.3度；X波段的波束宽度则约为1度。由于天线波束宽度极窄，ARM的扫描型云雷达采用了不同于常规天气雷达的扫描策略。KASACR并未采用主流的平面位置显示器（Plan Position Indicator，PPI）扫描模式，而是在多个方位角下执行距离高度显示器（Range Height Indicator，RHI）扫描，以此获取云体三维数据。该雷达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、谱宽以及非扫描状态下的频谱，还有线性退极化比。

目前，阿根廷境内2018—2019年云、气溶胶与复杂地形相互作用（Cloud, Aerosol, and Complex Terrain Interactions，CACTI）野外试验所获取的KASACR数据，已以b1级产品的形式对外发布。该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，数据质量得到显著提升：数据已完成统一交叉定标，针对试验期间出现的业务问题对数据流进行了修正，并集成了多组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》。