Journal ArticleDOI
Derivative constraints for broad-band element space antenna array processors
Meng Er,Antonio Cantoni +1 more
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TLDR
A class of linear constraints, also termed as derivative constraints, which is applicable to broad-band element space antenna array processors, is presented and can be made as broad as desired and the beam spacings can be selected without fear of substantial signal suppression in the event of signal arrivals between beams.Abstract:
In this paper a class of linear constraints, also termed as derivative constraints, which is applicable to broad-band element space antenna array processors, is presented. The performance characteristics of the optimum processor with derivative constraints are demonstrated by computer studies involving two types of array geometries, namely linear and circular arrays. As a consequence of derivative constraints, the beam width in the look direction can be made as broad as desired and the beam spacings can be selected without fear of substantial signal suppression in the event of signal arrivals between beams. However, this increased beam width is achieved at the price of reducing array gain.read more
Citations
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Journal ArticleDOI
Beamforming: a versatile approach to spatial filtering
B.D. Van Veen,K.M. Buckley +1 more
TL;DR: An overview of beamforming from a signal-processing perspective is provided, with an emphasis on recent research.
Journal ArticleDOI
Application of antenna arrays to mobile communications. II. Beam-forming and direction-of-arrival considerations
TL;DR: This paper provides a comprehensive and detailed treatment of different beam-forming schemes, adaptive algorithms to adjust the required weighting on antennas, direction-of-arrival estimation methods-including their performance comparison-and effects of errors on the performance of an array system, as well as schemes to alleviate them.
Journal ArticleDOI
Robust adaptive beamforming
TL;DR: It is shown that a simple scaling of the projection of tentative weights, in the subspace orthogonal to the linear constraints, can be used to satisfy the quadratic inequality constraint.
Journal ArticleDOI
On robust Capon beamforming and diagonal loading
TL;DR: It is shown that a natural extension of the Capon beamformer to the case of uncertain steering vectors also belongs to the class of diagonal loading approaches, but the amount of diagonalloading can be precisely calculated based on the uncertainty set of the steering vector.
Journal ArticleDOI
An overview of matched field methods in ocean acoustics
TL;DR: In this paper, a short historical overview of matched field processing (MFP) is presented, followed by background material in both ocean acoustics and array processing needed for MFP.
References
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Journal ArticleDOI
An algorithm for linearly constrained adaptive array processing
TL;DR: A constrained least mean-squares algorithm has been derived which is capable of adjusting an array of sensors in real time to respond to a signal coming from a desired direction while discriminating against noises coming from other directions.
Journal ArticleDOI
Resolving power and sensitivity to mismatch of optimum array processors
TL;DR: In this paper, the effects of mismatch on a conventional beamformer and two optimum beamformers are compared and conditions for the resolution of closely spaced sources by an optimum beamformer are presented.
Journal ArticleDOI
Adaptive arrays with main beam constraints
S. Applebaum,D. Chapman +1 more
TL;DR: This paper examines the major techniques for constraining the response of the adaptive processor, including methods of controlling the Response of the array in the absence of external interference, including angle domain techniques such as pilot signals, preadaption spacial filtering, and control loop spatial filtering.
Journal ArticleDOI
A simple adaptive algorithm for real-time processing in antenna arrays
TL;DR: The new algorithm is shown to converge to the optimum processor in the limit as the number of adaptations becomes large, and the variance of the adapted filter about the optimum solution can be made arbitrarily small by appropriate choice of a scalar constant in the algorithm.
Effects ofPerturbations on thePerformance of Optimum/Adaptive Arrays
TL;DR: In this paper, an investigation of the effects of system and medium perturbations, and the deviations of signal field statistics from usual assumptions, on the performance of adaptive arrays is presented.