X-SAPR Plan Position Indicator scan - xsaprppi

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波段双偏振多普勒天气雷达。该雷达采用同步收发（STAR）模式工作，即对发射信号进行分路，从而同时在水平与垂直偏振方向上发射功率。其发射机为峰值功率200千瓦的磁控管，接收机基于维萨拉RVP-900平台，运行维萨拉IRIS软件。

除前三个多普勒矩量（反射率、径向速度与谱宽）外，X-SAPR还可提供差分反射率、相关系数及比差分相位。双偏振气象变量可用于估算降雨速率并识别降水类型。在南大平原观测站点，三台X-SAPR环绕中央设施部署，支持通过多多普勒速度反演来获取风场估算结果。