The German Experimental Space Surveillance and Tracking Radar (GESTRA) system is one of the most modern radar systems for detecting objects in space. This unique system can monitor space debris and active space systems in low-Earth orbits around the clock. GESTRA was built by the Fraunhofer Institute for High-Frequency Physics and Radar Technology (FHR) on behalf of the DLR Space Administration with funding from the BMWi. It will soon enter operation from the FHR site near Koblenz. GESTRA will make a significant contribution to space security at national, European and international levels.