Direction-Finding Methods for Cyclostationary Signals in the Presence of Coherent Sources
Resource
IEEE Transactions on Antennas and Propagation 49 (12): 1821-1826
Journal
IEEE Transactions on Antennas and Propagation
Journal Volume
49
Journal Issue
12
Pages
1821-1826
Date Issued
2001-12
Author(s)
Abstract
By exploiting the signal cyclostationarity, conjugate cyclic MUSIC presented by Gardner (1994), has been shown to be effective in performing signal-selective direction finding. However, a direct application of conjugate cyclic MUSIC in the presence of coherent signals of interest (SOIs) will result in ambiguity. To tackle the drawback of conjugate cyclic MUSIC, we present a scheme called the Hankel approximation method (HAM) in conjunction with conjugate cyclic MUSIC to cope with the performance deterioration due to coherent SOIs for a uniform linear array. Theoretical analysis shows that at least 2K sensor elements are required to resolve K coherent SOIs. Making use of the forward/backward (F/B) technique presented by Pillai and Kwon (1989), F/B HAM is further developed, which requires [3K/2] sensor elements to decorrelate K coherent SOIs, where [x] represents the integer part of x. Several simulation examples are also presented for illustrating the effectiveness of the proposed methods.
Type
journal article
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