Journal ArticleDOI
Thinning and weighting of large planar arrays by simulated annealing
TLDR
A synthesis method is proposed that is aimed at designing an aperiodic sparse two-dimensional array to be used with a conventional beam-former, and can design very large arrays, optimize both positions and weight coefficients, synthesize asymmetric arrays, and generate array configurations that are valid for every steering direction.Abstract:
Two-dimensional arrays offer the potential for producing three-dimensional acoustic imaging. The major problem is the complexity arising from the large number of elements in such arrays. In this paper, a synthesis method is proposed that is aimed at designing an aperiodic sparse two-dimensional array to be used with a conventional beam-former. The stochastic algorithm of simulated annealing has been utilized to minimize the number of elements necessary to produce a spatial response that meets given requirements. The proposed method is highly innovative, as it can design very large arrays, optimize both positions and weight coefficients, synthesize asymmetric arrays, and generate array configurations that are valid for every steering direction. Several results are presented, showing notable improvements in the array characteristics and performances over those reported in the literature.read more
Citations
More filters
Journal ArticleDOI
Sparse 2-D arrays for 3-D phased array imaging - design methods
Andreas Austeng,Sverre Holm +1 more
TL;DR: This work proposes new methods based on the principles of suppression of grating lobes to form symmetric and non-symmetric regular sparse periodic and radially periodic designs and introduces two new strategies to form designs with nonoverlapping elements.
Journal ArticleDOI
Three-dimensional image generation and processing in underwater acoustic vision
Vittorio Murino,Andrea Trucco +1 more
TL;DR: The state of-the art of the techniques and algorithms for acoustic image generation and processing are established, providing technical details and results for the most promising techniques, and pointing out the potential capabilities of this technology for underwater scene understanding are established.
Journal ArticleDOI
Linear Array Thinning Exploiting Almost Difference Sets
TL;DR: In this paper, a class of linear thinned arrays with predictable and well-behaved sidelobes is described, where element placement is based on almost difference sets and the array power pattern is forced to pass through N uniformly-spaced values that, although neither equal nor constant as for difference sets, are a-priori known from the knowledge of the aperture size, the number of active array elements K, and the features of the correlation function.
Journal ArticleDOI
Compressive Sensing Pattern Matching Techniques for Synthesizing Planar Sparse Arrays
TL;DR: In this paper, the design of sparse planar arrays is yielded through a set of innovative and efficient pattern matching algorithms within the Bayesian Compressive Sensing (BCS) framework and the single-task and the multi-task BCS solutions are derived.
Journal ArticleDOI
ADS-Based Guidelines for Thinned Planar Arrays
TL;DR: In this paper, an analytical technique based on almost difference sets (ADSs) was proposed for thinning planar arrays with well controlled sidelobes, which allows one to synthesize bidimensional arrangements with peak sidelobe levels (PSLs) predictable and deducible from the knowledge of the array aperture, the filling factor, and the autocorrelation function of the ADS at hand.
References
More filters
Journal ArticleDOI
Optimization by Simulated Annealing
TL;DR: There is a deep and useful connection between statistical mechanics and multivariate or combinatorial optimization (finding the minimum of a given function depending on many parameters), and a detailed analogy with annealing in solids provides a framework for optimization of very large and complex systems.
Book
Simulated Annealing: Theory and Applications
TL;DR: Performance of the simulated annealing algorithm and the relation with statistical physics and asymptotic convergence results are presented.
Journal ArticleDOI
Thinned arrays using genetic algorithms
TL;DR: This paper presents how to optimally thin an array using genetic algorithms, which determines which elements are turned off in a periodic array to yield the lowest maximum relative sidelobe level.
Journal ArticleDOI
High-speed ultrasound volumetric imaging system. I. Transducer design and beam steering
TL;DR: The authors describe the design considerations and preliminary evaluation of a high-speed, online volumetric ultrasound imaging system that uses the principles of pulse-echo, phased array scanning with a 2-D array transducer.
Journal ArticleDOI
Synthesis of unequally spaced arrays by simulated annealing
TL;DR: High flexibility of simulated annealing is applied to the synthesis of arrays in order to reduce the peaks of side lobes by acting on the elements' positions and weight coefficients.