The GPM Ground Validation NASA Micro Rain Radar (MRR) guide describes the data format and the vertically pointing Doppler radar which provides measurements of vertical velocity, drop size distribution, rainfall rate, attenuation, liquid water content, and reflectivity factor obtained during the GPM Cold-season Precipitation Experiment (GCPEx), which took place in Canada during Winter 2011-2012. The MRR is a frequency-modulated continuous wave (FMCW) vertically pointing Doppler radar, which operates at 24.24GHz, and it is the second generation of the instrument manufactured by METEK (http://www.metek.de/product-details/mrr-2.html). NASA MRR data was collected from late October 2011 through March 2013.
