Application of blind signal separation techniques to Airborne Antenna Arrays.

Airborne antenna arrays su}er from the problem of multipath\ formed due to scattering of the desired signal by the aircraft propellers[ The direct path includes the desired signal coming from a sonobuoy ~oating in the ocean or from other airborne radars\ and their re~ections from the ocean surface[ Numerous techniques have been proposed for multipath mitigation and localization of the desired signal\ that assume the propeller scatters to be point sources\ which is not true in actual scenarios[ Also\ the multipath from the ocean that accompanies the direct signal\ leads to a complicated spatial signature\ making existing techniques unsuitable[ In this paper\ we propose a new technique which deals with the propeller scatters as spatially extended sources\ and also takes into account the signal re~ections from the ocean[ The problem is presented as that of blind signal separation[ The objective is two!fold\ localization of the desired signal and extraction of its waveform[ The Second order Blind Identi_cation "SOBI# algorithm is applied to obtain the spatial signatures of the desired signal and the multipath\ which are then used to obtain both the temporal and spatial characteristics of the signals[ An e.cient method for recovering the desired waveform is also formulated[

Main Author: Bhalla, Nitin.
Other Authors: Belouchrani, Adel., Amin, Moeness G.
Language: English
Published: 1999
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