ProSensing (formerly known as Quadrant Engineering) is a systems engineering company that specializes in custom-built radar and radiometer systems for environmental remote sensing applications. It designs and builds millimeter-wave and weather radars, polarimetric scatterometers, G-band water vapor and hurricane wind speed radiometers, trihedral corner reflectors, radiometer calibration cold loads, etc. The company serves government research agencies, university research groups, and large corporations.