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Author Scholnik, D.P. ♦ Coleman, J.O.
Sponsorship IEEE Signal Processing Society
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©2007
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Physics ♦ Electricity & electronics
Subject Keyword Wideband ♦ Computer architecture ♦ Polarization ♦ Signal synthesis ♦ Radio frequency ♦ Radar ♦ Signal generators ♦ Signal design ♦ Digital signal processing ♦ Digital filters ♦ second-order cone programming ♦ Antenna arrays ♦ array signal processing ♦ optimization methods
Abstract Some next-generation radio frequency systems are expected to share a common transmit aperture among multiple users across a wide range of frequencies and functions such as radar and communications. The requisite linear architectures and digital signal generation will permit far greater flexibility in the design of array patterns than traditional time-delay steered wideband transmit arrays. Merely replicating the traditional architecture in digital signal processing would generally represent an inefficient use of computational resources; thus, we propose instead to place a finite-impulse response filter per input signal at each element and to directly optimize the resulting wideband array pattern. For this architecture, we present a passband-equivalent transmit-array model and derive expressions for wideband directivity, efficiency, error sensitivity, gain, peak and mean-square sidelobes, mainlobe frequency-response flatness, and polarization. All can be constrained using second-order cone programming, a highly-efficient type of convex optimization. Several examples illustrate the design tradeoffs, including the need to limit undesirable superdirective effects in wideband arrays. The system model and the derivations are general enough to admit almost any array architecture, including arbitrary element locations, nonuniform element responses, and multiple polarizations.
Description Author affiliation :: Naval Res. Lab., Washington
ISSN 19324553
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2007-12-01
Publisher Place U.S.A.
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Volume Number 1
Issue Number 4
Size (in Bytes) 1.92 MB
Page Count 18
Starting Page 660
Ending Page 677

Source: IEEE Xplore Digital Library