The Global Precipitation Measurement (GPM) Mission is a collaboration between the National Aeronautics and Space
Administration (NASA) and the Japanese Aerospace Exploration Agency (JAXA), and other US and international
partners, with the goal of monitoring the diurnal and seasonal variations in precipitation over the surface of the earth.
These measurements will be used to improve current climate models and weather forecasting, and enable improved
storm and flood warnings. This paper gives an overview of the mission architecture and addresses the status of some key
trade studies, including the geolocation budgeting, design considerations for spacecraft charging, and design issues
related to the mitigation of orbital debris.