|Robert A. Gabel
MIT Lincoln Laboratory
244 Wood Street
Lexington, MA 02173-9108
Abstract With the advent of high-quantity antenna arrays and adaptive nulling techniques, it has become possible to greatly reduce the effects of direct-path interference on radar and communication systems. As a consequence, terrain-scattered main-beam interference has become a potentially limiting factor on system performance. In contrast with direct-path arrivals, multipath interference signals may be difficult to attenuate, since they can be widely dispersed in azimuth, delay, and Doppler.
This presentation describes elements of the ARPA Mountaintop program that were designed to measure terrain-scattered jammer phenomena, identify sources of the underlying scattering, and develop algorithms to lessen the adverse effects of scattered interference. This presentation focuses on the azimuth-adaptive RSTER-90 array configuration using both ground-based and aircraft-based jammers. The jammer energy is portrayed as a function of bistatic delay and azimuth, illustrating both the direct and terrain-scattered jammer components. Adaptive algorithms for jammer mitigation are discussed and their performance against measured interference is analyzed in the context of jammer scenario.
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