GPM Ground Validation Dual-frequency Dual-polarized Doppler Radar (D3R) OLYMPEX

The GPM Ground Validation Dual-frequency Dual-polarized Doppler Radar (D3R) OLYMPEX dataset contains radar reflectivity, velocity, differential reflectivity, differential phase, spectrum width, and co-polar correlation products collected during the Global Precipitation Measurement mission (GPM) Ground Validation (GV) Olympic Mountains Experiment (OLYMPEX). The OLYMPEX field campaign took place between November 2015 and January 2016, with additional ground sampling continuing through February 2016, on the Olympic Peninsula in the Pacific Northwest of the United States. The purpose of the campaign was to provide ground-validation data for the measurements taken by instrumentation aboard the GPM Core Observatory satellite. The Dual-frequency Dual-polarized Doppler Radar (D3R) was developed by a government-industry-academic consortium with funding from NASA’s GPM mission and was used in several ground validation projects. D3R operates at the Ku-band (13.91 GHz ± 25 MHz) and Ka-band (35.56 GHz ± 25 MHz) frequencies, similar to the frequencies used for the GPM satellite instruments, and covers a fixed range from 450 m to 40 km. For OLYMPEX, the D3R was co-located with the NASA S-band Dual Polarimetric (NPOL) Doppler Radar at a coastal Washington state location on the Olympic Peninsula. Due to blockage caused by NPOL, the D3R measurement area is limited to a 220 degree to 120 degree sector. The GPM GV D3R OLYMPEX dataset files are available from November 8, 2015 through January 15, 2016 in netCDF-4 format along with browse imagery of reflectivity in PNG format.

GPM 地面验证双频双偏振多普勒雷达（D3R）OLYMPÉX 数据集收录了在全球降水测量任务（GPM）地面验证（GV）奥林匹克山脉实验（OLYMPÉX）期间收集的雷达反射率、速度、差分反射率、差分相位、频谱宽度和同极化相关产品。该OLYMPÉX实地考察活动于2015年11月至2016年1月间进行，并在2016年2月继续进行额外的地面采样，地点位于美国太平洋西北部的奥林匹克半岛。此次考察旨在为搭载GPM 核心观测卫星的仪器所进行的测量提供地面验证数据。双频双偏振多普勒雷达（D3R）由政府、工业和学术界组成的联合体开发，并获得美国国家航空航天局（NASA）GPM任务的资金支持，并在多个地面验证项目中得到应用。D3R 工作在Ku频段（13.91 GHz ± 25 MHz）和Ka频段（35.56 GHz ± 25 MHz），与GPM 卫星仪器的频率相似，并覆盖从450米到40公里的固定距离。对于OLYMPÉX项目，D3R 与位于奥林匹克半岛华盛顿州沿海地区的NASA S波段双偏振（NPOL）多普勒雷达共同定位。由于NPOL的遮挡，D3R的测量区域被限制在220度至120度的扇区。GPM GV D3R OLYMPÉX数据集文件以netCDF-4格式提供，并附带PNG格式的反射率浏览图像，可从2015年11月8日至2016年1月15日获取。