Exploiting Multipath from Airborne Platforms for Direction of Arrival Estimation

Conference: EuCAP 2009 - 3rd European Conference on Antennas and Propagation
03/23/2009 - 03/27/2009 at Berlin, Germany

Proceedings: EuCAP 2009

Pages: 5Language: englishTyp: PDF

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Nikolic, Marija M. (Department of Electrical and Systems Engineering, Washington University in St. Louis, St. Louis, MO 63130 USA)
Nikolic, Marija M.; Djordjevic, Antonije R. (School of electrical Engineering, University of Belgrade, Bulevar Kralja Aleksandra 73, 11000 Belgrade, Serbia)

In the direction-of-arrival estimation, the scattering of the incident signal from airborne platforms is often neglected or considered as a source of clutter. However, these additional signal paths, mostly due to the diffraction from the platform wedges, contain useful information about the incoming waves. Recent research showed that the waves reflected from the known objects surrounding the target improve the accuracy of the target estimation or image. We show that similar improvement is obtained if the array interaction with the hosting platform is taken into the account. We incorporate the multipath into the signal processing algorithms, and study the improvement by computing the Cramer-Rao bound. We show that the exploitation of the multipath from the sensor platforms improves the estimation accuracy significantly. Moreover, the capacity to resolve multiple incident signals is enhanced.