2-D-IIR Time-Delay-Sum Linear Aperture Arrays

A uniform linear array (ULA) digital beamformer with enhanced selectivity (interference rejection) over conventional true-time delay-sum (TTDS) beamforming is proposed for scanned aperture applications. Conventional TTDS transfer function, which contains only zero-manifolds, is modified by introduci...

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Bibliographic Details
Published in:IEEE antennas and wireless propagation letters 2014, Vol.13, p.591-594
Main Authors: Madanayake, Arjuna, Wijenayake, Chamith, Wijayaratna, Sewwandi, Acosta, Roberto, Hariharan, S. I.
Format: Article
Language:English
Subjects:
Antenna arrays
Antennas
Apertures
Array signal processing
Arrays
Beamforming
Digital
Frequency-domain analysis
Infinite impulse response (IIR)
Interference
linear antenna arrays
Noise levels
phased arrays
Selectivity
Transfer functions
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Summary:A uniform linear array (ULA) digital beamformer with enhanced selectivity (interference rejection) over conventional true-time delay-sum (TTDS) beamforming is proposed for scanned aperture applications. Conventional TTDS transfer function, which contains only zero-manifolds, is modified by introducing complex pole-manifolds based on 2-D infinite impulse response (IIR) digital beam filters, thereby achieving enhanced selectivity for the same number of antennas in the ULA. For a ULA of 64 antennas, desired direction of arrival (DOA) 30° and interference DOA -60 ° from array broadside, a relative improvement in signal-to-interference ratio (SIR) of 7 dB is verified. For 128-element ULA, interference DOA -10°, a relative improvement in SIR of 5-10 dB is obtained for the desired DOA in the range 10°-90°. The projected improvements are independent of the weights of the conventional phased-array, TTDS, or filter-sum beamformer used because the method does not change the zero-manifolds of the original array pattern.
ISSN:1536-1225
1548-5757
DOI:10.1109/LAWP.2014.2312109