Results 211 to 220 of about 11,492 (243)

Improved array weighting for short nested arrays

The Journal of the Acoustical Society of America, 2019
Often linear acoustic arrays are comprised of shorter nested subcomponent arrays cut for higher frequencies. This reduces costs and complexity by trading-off performance, specifically in resolution, SNR, and grating lobes. Typically each sub-aperture is processed individually, and the results incoherently combined over a frequency bandwidth of interest.
Geoffrey F. Edelmann, Magnus L. Nordenvad   +1 more
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Calibrating Nested Sensor Arrays With Model Errors

IEEE Transactions on Antennas and Propagation, 2014
We consider the problem of direction of arrival (DOA) estimation based on a nonuniform linear nested array, which is known to provide $O(N^2)$ degrees of freedom (DOFs) using only $N$ sensors. Both subspace-based and sparsity-based algorithms require certain modeling assumptions, e.g., exactly known array geometry, including sensor gain and ...
Keyong Han, Peng Yang 0006, Arye Nehorai
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Nested arrays and operators

ACM SIGAPL APL Quote Quad, 1992
Following the new direction taken by the ISO Standards Committee meeting in Palo Alto, during August, 1991, an extended APL standard is considered using a nested array basis with particular features from IBM's APL2 program product. APL2 develops from ISO APL with the relaxation of two early scalar constraints.
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A Novel Nested Array for Real-Valued Sources Exploiting Array Motion

IEEE Signal Processing Letters, 2021
In this letter, a novel nested array is proposed which not only increases the degrees of freedom (DOF) but also reduces the mutual coupling that occurs in the general nested array structure by moving the original array only half wavelength. Here we deal with real-valued sources like AM or BPSK whereby we can explore the property of the sum coarray ...
Rajen Kumar Patra, Anindya Sundar Dhar
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Bounds for asymmetric nested orthogonal arrays

Discrete Mathematics
The paper explores nested orthogonal arrays (NOAs), which are widely used in statistical experiments and fractional factorial designs when different factors require different numbers of levels. It addresses the core problem of determining minimal sizes (i.e., the smallest possible number of runs) for constructing such NOAs, under asymmetry constraints (
Xiao Lin, Shanqi Pang, Guangzhou Chen
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DOA estimation in conformal arrays based on the nested array principles

Digital Signal Processing, 2016
The nested array structure has attracted great attention recently due to its ability in reducing the number of sensors in an array and at the same time preserving the array performance. While a uniform linear array (ULA) can detect at most N - 1 sources with N sensors, a nested array can provide O ( N 2 ) degrees of freedom with the same number of ...
Pourya Alinezhad, Saeid Reza Seydnejad, Dariush Abbasi-Moghadam   +2 more
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Stability of compression of the inner array plasma in nested arrays

Plasma Physics Reports, 2017
The implosion of nested fiber/wire arrays was studied experimentally at the Angara-5-1 facility. The outer array consisted of kapron fibers, while the inner array was made of tungsten wires. The experiments were carried out at a discharge current of 3 MA.
K. N. Mitrofanov, V. V. Aleksandrov, E. V. Grabovski, A. V. Branitsky, A. N. Gritsuk, I. N. Frolov, Ya. N. Laukhin   +6 more
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Nested arrays as an extension for APL

Proceedings of the international conference on APL: part 1 - APL '79, 1979
This workshop will be held to inform interested members of the APL community about current research on adding nested arrays to APL. The Chairman will present a brief summary of current research in the area, indicating the issues that are yet unresolved, and presenting a set of criteria for deciding them.
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Optimization of the inner array in a nested array Z-pinch

IEEE Conference Record - Abstracts. 1999 IEEE International Conference on Plasma Science. 26th IEEE International Conference (Cat. No.99CH36297), 1999
Summary form only given. Nested wire arrays have been used to improve pinch quality and X-ray power. Numerical simulations suggest that the inner array acts to reduce the growth of the MHD Rayleigh-Taylor (RT) instability present in the outer array prior to impact.
K. Cochrane, M. Douglas, N.F. Roderick
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Systolic array implementation of nested loop programs

[1990] Proceedings of the International Conference on Application Specific Array Processors, 2002
The authors consider a formal and systematic method to convert a class of nested loop programs to single assignment codes and, when possible, to regular algorithms (RAs) for systolic array implementation. The authors concentrate on the analysis of certain imperative nested loop programs in view of the ultimate objective, which is the (semi)-automatic ...
Jichun Bu, Ed F. Deprettere, Lothar Thiele   +2 more
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