wsacrspeccmaskxpol (a0)

ARM's scanning cloud radars are fully coherent 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 (WSACR; 1.7 kW peak power) or X-band (XSACR; 20 kW peak power). Beamwidths at Ka and W bands are roughly matched at 0.3 degrees. Due to the narrow antenna beamwidth, ARM’s scanning cloud radars use scanning strategies that are 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 W-SACR are copolar and cross-polar radar reflectivity, Doppler velocity, spectra width and spectra when not scanning, and linear depolarization ration.

ARM扫描式云雷达均为全相干双频双极化多普勒雷达，搭载于统一扫描基座之上。每座基座均配备一部Ka波段雷达（峰值功率2kW），部署位置将决定第二部雷达为W波段雷达（WSACR；峰值功率1.7kW）还是X波段雷达（XSACR；峰值功率20kW）。Ka波段与W波段的波束宽度均约为0.3°，二者大致匹配。由于天线波束极窄，ARM扫描式云雷达所采用的扫描策略与常规天气雷达截然不同。其并未聚焦于平面位置指示（plan position indicator, PPI）扫描模式，Ka波段扫描云雷达（Ka-SACR）会针对多个方位角执行距离高度指示（range height indicator, RHI）扫描，以获取云体三维体积数据。W-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、谱宽，以及非扫描状态下的频谱与线性退极化比（linear depolarization ratio）。