Bi- and monostatic SAR-GMTI

This chapter presents a novel simultaneous monostatic and bistatic ground moving target indication (GMTI) mode for improved target detection and imaging capability. The mode uses an airborne multichannel radar system and a stationary transmitter. Both systems transmit simultaneously on adjacent frequency bands, and the airborne multichannel system receives both its monostatic echoes and the bistatic returns. Geometrical diversity between the monostatic and the bistatic measurements enhances moving target-detection capabilities. Moreover, for movers detected in both datasets, an estimation of the target velocity vector (i.e., velocity and direction of motion) can be performed. By simply extracting a singlechannel dataset, this also allows correct focusing of moving targets both in monostatic and in bistatic datasets, if SAR-GMTI capability is required. Consequently, situational awareness over the observed area is greatly improved. The effectiveness of the proposed technique is analyzed both from a theoretical point of view and by means of an ad-hoc experiment conducted by the Fraunhofer Institute for High Frequency Physics and Radar Techniques (FHR) in fall 2013.