W-Band Scanning ARM Cloud Radar, filtered spectral data, cross-polarized mode - wsacrspeccmaskxpol

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. \n \nDue 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. \n \nMeasurements 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扫描云雷达是搭载于统一扫描基座的全相干双频双极化多普勒雷达（fully coherent dual-frequency, dual-polarization Doppler radars）。每个基座配备一部Ka波段雷达（峰值功率2kW），其部署场景决定了配套的第二部雷达为W波段（WSACR；峰值功率1.7kW）或X波段（XSACR；峰值功率20kW）。Ka波段与W波段的波束宽度大致相当，均为0.3°。

由于天线波束宽度极窄，ARM扫描云雷达采用不同于常规气象雷达的扫描策略。Ka-SACR并未采用常规的平面位置显示器（plan position indicator, PPI）扫描模式，而是通过在多个方位角上执行距离高度显示器（range height indicator, RHI）扫描，以获取云体的三维体积数据。

W-SACR采集的测量数据包括同极化与交叉极化雷达反射率、多普勒速度、谱宽、非扫描状态下的频谱，以及线性退极化比（linear depolarization ratio）。