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扫描云雷达是安装于统一扫描基座上的全相干双频双偏振多普勒雷达。每座基座搭载一部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（WSACR；峰值功率1.7kW）或是X波段（XSACR；峰值功率20kW）。Ka波段与W波段的波束宽度大致匹配，均约为0.3度。

由于天线波束宽度极窄，ARM扫描云雷达采用的扫描策略与常规天气雷达截然不同。Ka波段扫描云雷达（Ka-SACR）并未侧重平面位置显示器（"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，以及非扫描状态下的频谱与线性退极化比（linear depolarization ratio）。