NDLI: Broadband efficient adaptive method for true-time-delay array processing

Content Provider	IEEE Xplore Digital Library
Author	Wagner, K.H. Weaver, S. Kraut, S. Griffiths, L. Weverka, T.R.
Copyright Year	1998
Description	Author affiliation: Optoelectron. Comput. Syst. Center, Colorado Univ., Boulder, CO, USA (Wagner, K.H.)
Abstract	In this paper we present a new approach to efficient true-time-delay (TTD) beamforming for large adaptive phased arrays as well as its elegant and compact optical implementation. This broadband and efficient adaptive Method for time-delay array processing (BEAMTAP) algorithm decreases the number of tapped delay lines required to process an N-element phased array antenna from N to only 2, producing an enormous savings in delay-line hardware, especially for large arrays, while still providing the full NM degrees of freedom of a conventional N element time delay beamformer with M taps each. This allows the system to fully and optimally adapt to an arbitrarily complex spatio-temporal signal environment that can contain broadband signals, noise, and narrowband and broadband jammers, all of which can arrive from arbitrary ranges and angles onto an arbitrarily shaped array, thus enabling a variety of application in radar, sonar, and communication. This algorithm is an excellent match with the capabilities of RF photonic systems using gratings in photorefractive crystals as adaptive weights, because the hardware implementation of tapped delay lines is the factor which limits the scalability of these systems to large arrays. Because the number of available adaptive coefficients in a photorefractive crystal is practically unlimited, these photonic systems can adaptively control very large 1-D or 2-D phased arrays, that are well beyond the capabilities of conventional RF or real-time digital signal processing techniques.
Starting Page	289
Ending Page	298
File Size	1063261
Page Count	10
File Format	PDF
ISBN	0780343115
ISSN	1095323X
DOI	10.1109/AERO.1998.685835
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-03-28
Publisher Place	Colorado
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Adaptive arrays Phased arrays Photonic crystals Array signal processing Optical arrays Signal processing algorithms Delay lines Antenna arrays Broadband antennas Delay effects
Content Type	Text
Resource Type	Article
Subject	Aerospace Engineering Space and Planetary Science

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