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双偏振多普勒雷达，搭载于共用扫描转台。每个转台包含一台Ka波段雷达（峰值功率2kW），且根据部署场地的不同，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）。

Ka波段与W波段配对时，波束宽度大致匹配，约为0.3°；X波段波束宽度约为1°。由于天线波束极窄，ARM扫描云雷达采用了不同于常规天气雷达的扫描策略。KASACR并未聚焦于平面位置指示（Plan Position Indicator，PPI）扫描，而是在多个方位角上采用距离高度指示（Range Height Indicator，RHI）扫描，以获取云体三维数据。该设备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频谱，以及线性退极化比。

目前，2018-2019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）外场试验的KASACR数据已作为b1级产品发布。相较于原始CACTI业务数据，b1级产品经过全面分析与校正，数据质量得到显著提升：数据已交叉校准至统一基准，针对试验期间出现的业务问题对数据流进行了修正，并集成了多套数据质量掩码及基础衍生产品。如需了解更多细节，请参阅《CACTI雷达b1级处理报告》。