Results 241 to 250 of about 457,797 (282)

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 ...
Saeid Seydnejad, Dariush Abbasi-Moghadam
exaly   +3 more sources

Robust adaptive beamforming in nested array

Signal Processing, 2015
In this communication, we consider the problem of designing robust adaptive beamformer in the newly proposed nested array, where we maintain distortionless response towards the true desired signal and suppress more interferences than the number of actual physical sensors.
Jie Yang 0075, Guisheng Liao, Jun Li 0007   +2 more
openaire   +2 more sources

Two dimensional nested arrays on lattices

2011 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2011
In this paper, we develop the theory of a new class of two dimensional arrays with sensors on lattice(s) which can be used to construct a virtual array of much larger size through passive processing. This structure is obtained by systematically nesting two arrays, one with sensors suitably placed on a sparse lattice and the other on an appropriately ...
Pal, Piya, Vaidyanathan, P. P.
openaire   +3 more sources

Operators in an APL containing nested arrays

ACM SIGAPL APL Quote Quad, 1978
Formal definitions of several functions and operators for manipulating nested arrays are presented. Three operators that control the application of a function to the items or groups of items of an array are defined. In addition, the definition of current APL operators is extended to nested arrays. A proposal is presented to accept some of the ideas for
Michael A. Jenkins, Jean Michel
openaire   +2 more sources

Array Gain of a Nested Array in Spatially Uncorrelated Noise

2021 OES China Ocean Acoustics (COA), 2021
Spatial resolution will be improved with the increment of the aperture in array signal processing. In order to obtain high resolution, a large number of sensors are needed for the uniform linear array (ULA), resulting in the high hardware cost and computational complexity.
Ran Cao, Xuan Zhou, Jingwei Yin, Longxiang Guo   +3 more
openaire   +1 more source

Nested Array Processing for Distributed Sources

IEEE Signal Processing Letters, 2014
We consider the problem of using linear nested arrays to estimate the directions of arrival (DOAs) of distributed sources and to detect the source number, where we have more sources than actual physical sensors. Angular spread, caused by the multipath nature of the distributed sources, makes the commonly used point-source assumption challenging.
Keyong Han, Arye Nehorai
openaire   +2 more sources

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
openaire   +1 more source

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
openaire   +2 more sources

Transmit Subaperturing for MIMO Radars With Nested Arrays [PDF]

Signal Processing, 2017
Abstract We consider a multiple-input multiple-output (MIMO) radar equipped with a colocated nested array for both transmit and receive. A novel transmit subaperturing (TS) approach that decomposes the nested array into unequal subarrays is proposed to take the advantage of the degrees of freedom (DOF) provided by the nested array but without ...
Hongbin Li, Linlin Mao, Qunfei Zhang
exaly   +2 more sources

Nested Arrays: A Novel Approach to Array Processing With Enhanced Degrees of Freedom [PDF]

IEEE Transactions on Signal Processing, 2010
A new array geometry, which is capable of significantly increasing the degrees of freedom of linear arrays, is proposed. This structure is obtained by systematically nesting two or more uniform linear arrays and can provide O(N2) degrees of freedom using only N physical sensors when the second-order statistics of the received data is used.
Piya Pal, Palghat Vaidyanathan
exaly   +4 more sources