GESTRA

GESTRA (German Experimental Space Surveillance and Tracking Radar) is a quasi-monostatic L-band phased-array radar operating between 1280 and 1380 MHz. Developed by the Fraunhofer Institute for High-Frequency Physics and Radar Techniques in Wachtberg, Germany, it is designed for space surveillance and tracking in low-Earth orbit. The system monitors objects at altitudes from 300 to 3000 km, supporting the German Space Situational Awareness Center in cataloging orbital data. GESTRA utilizes separate transmitting and receiving antennas, spaced approximately 100 meters apart, each with 256 active cavity-backed stacked patch antennas in a circular arrangement. The transmitting radiators use linear polarization, while the receiving elements are designed for dual polarization and employ digital beamforming.

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