Mitigation of wing flexure induced errors for airbornedirection-finding applications
Gustafsson, K.
McCarthy, F.
Paulraj, A.
Ericsson Mobile Commun. AB, Lund;
This paper appears in: Signal Processing, IEEE Transactions on
Publication Date: Feb 1996
Volume: 44,
Issue: 2
On page(s): 296-304
ISSN: 1053-587X
References Cited: 16
CODEN: ITPRED
INSPEC Accession Number: 5235950
Digital Object Identifier: 10.1109/78.485925
Current Version Published: 2002-08-06
Abstract
Errors in array calibration are the dominant error source for
direction finding (DF) in airborne platforms. This problem arises since
wings in large surveillance aircraft exhibit significant flexure, and
their actual instantaneous positions during array calibration and
operational flight is likely to be quite different. Scattering from
time-varying wing structures onto the belly mounted antennas therefore
causes the array responses to deviate from the array calibration and
gives rise to DF errors. We present a simple model for array manifold
perturbations due to wing flexure that captures their effect. The model
is physically motivated and has been validated using experiments on a
scale-model aircraft in an anechoic chamber. Our model can be exploited
to derive new versions of the classical DF estimation schemes including
weighted subspace fitting (WSF)
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