Demonstration satellites built by Northrop Grumman and Raytheon successfully tracked a ground-based missile launch in a systems test last month. Tracking data generated by satellite sensors was transmitted to the Missile Defense Integration and Operation Center in Colorado Springs, Colo., which serves as the ground station for the two demonstration spacecraft, Northrop Grumman said in a news release "The STSS satellites operated as expected and the system generated high-quality track data during the boost phase in this first missile test of capabilities," said Gabe Watson, vice president, missile defense and missile warning programs for Northrop Grumman Aerospace Systems.