Northrop Grumman Corporation (NYSE:NOC) has been selected to supply a Scalable Space Inertial Reference Unit (Scalable SIRU(TM)) for NASA's Global Precipitation Measurement (GPM) Mission. The Scalable SIRU™ is an inertial reference system that supplies critical rotation rate data that enables the stabilization, pointing, and attitude control of satellites and space vehicles. For the GPM mission, the Scalable SIRU will be installed on the GPM Core Observatory satellite. The satellite-based GPM mission will study global precipitation from space, allowing regional and global scale precipitation measurement, which cannot be easily collected from the ground. The Core Observatory, which will serve as the reference standard for precipitation estimates from other GPM constellation spacecraft, is scheduled to launch on July 21, 2013. Accurate physical orientation of the Core Spacecraft is vital to ensure the correct mapping of precipitation data originating on Earth. Scalable SIRU missions include Earth observation, communications, and science applications in low earth orbit, geostationary, and deep space mission profiles. Northrop Grumman's Hemispherical Resonating Gyro technology installed in the Scalable SIRU has reached more than 14 million operating hours in space without a mission failure.