The GPM Core Observatory satellite carries two instruments (the GPM Microwave Imager (GMI) and the Dual-frequency Precipitation Radar (DPR)) that measure properties of precipitation from space using a combination of active and passive remote-sensing techniques. Together, these measurements provide insights into behavior and characteristics of precipitation and provide a source for calibrating, unifying, and improving precipitation measurements from a constellation of research and operational satellites with microwave sensors in order to create a global dataset of precipitation measurements.