X-Band Scanning ARM Precipitation Radar (XSAPR); Plan-Position-Indicator Scan - xsaprcfrppi

The X-band Scanning ARM Precipitation Radar (X-SAPR) is an X-band dual-polarization Doppler weather radar. The X-SAPR operates in a simultaneous transmit and receive (STAR) mode, meaning that the transmit signal is split so that power is transmitted on both horizontal and vertical polarizations at the same time. The X-SAPR transmitter is a 200 kW (peak power) magnetron. The receiver is based upon the Vaisala RVP-900 and runs Vaisala s IRIS software. \n \nIn addition to the first three Doppler moments (reflectivity, radial velocity, and spectra width), the X-SAPR also provides differential reflectivity, correlation coefficient, and specific differential phases. The dual-polarization variables enable estimates of rainfall rates and identification of precipitation types. At the Southern Great Plains site, three X-SAPRs surround the Central Facility, allowing the use of multi-Doppler velocity retrievals to estimate wind fields.X波段扫描型ARM降水雷达（X-band Scanning ARM Precipitation Radar，X-SAPR）是一款X波段双极化多普勒天气雷达。该雷达采用同步收发（STAR，simultaneous transmit and receive）模式，即对发射信号进行拆分，可同时在水平与垂直极化方向发射功率。X-SAPR的发射机为峰值功率200千瓦的磁控管（magnetron），其接收机基于维萨拉（Vaisala）RVP-900硬件，并运行维萨拉的IRIS软件。 除反射率因子、径向速度与谱宽这前三个多普勒矩量外，X-SAPR还可提供差分反射率、相关系数及比差分相位。双极化变量可用于降雨率估算与降水类型识别。在南大平原观测站点，三台X-SAPR环绕中央设施布设，能够通过多多普勒速度反演来估算风场。