Results 261 to 270 of about 808,226 (293)

Behavior of diagonal-to-column joint under cycling loading

Pollack Periodica, 2011
Non-linear analysis of steel semi-rigid diagonal-to-column joint is presented in the paper. Investigated joint is a part of a structural system, which was often used in Slovakia. The results from analysis will help with the correct preparation of a test. Evaluation of stiffness and resistance of this joint is the purpose. These parameters are the input
Lang, Tibor, Sokol, Milan
openaire   +2 more sources

Coarseness in OTHR Image and Its Application for Diagonal Loading Factor Determination

IEEE Geoscience and Remote Sensing Letters, 2020
The sky-wave over-the-horizon radar is easily interfered with by radio frequency interference (RFI) since the high-frequency band is shared by many radio devices. Various RFI suppression techniques have been developed by both spatial and temporal processing.
Zhaoyi Wang, Zhongtao Luo, Zishu He, Shengnan Shi   +3 more
openaire   +1 more source

Wideband Automatic Diagonal-Loading Beamformers for Acoustic Imaging

2009 2nd International Congress on Image and Signal Processing, 2009
The data-independent delay-and-sum beamformer (DAS) is widely used for acoustic imaging applications, although it has lower resolution and worse interference rejection capability than the standard Capon beamformer (SCB). However, the performance of SCB can be degraded by many factors existed in practice, for example, array covariance matrix estimation ...
Qi Xu, Xiaochuan Ma, Jun Yang
openaire   +1 more source

Equivalence of adaptive array diagonal loading and omnidirectional jamming

IEEE Transactions on Antennas and Propagation, 1995
Diagonal loading, where a diagonal matrix is added to the estimate of the covariance matrix, is often used in adaptive arrays to minimize the array's responsiveness to random fluctuations in the estimate of the interference environment. Poor estimates of the covariance matrix often result in high random sidelobes in the sample matrix inversion (SMI ...
openaire   +1 more source

Robust Adaptive Diagonal Variable Loading RLS Beamforming

INTERNATIONAL JOURNAL ON Advances in Information Sciences and Service Sciences, 2012
This paper deals with diagonal variable loading recursive least squares (VLRLS) array beamforming based on a generalized sidelobe canceller. In conjunction with a subweight partition approach, the VLRLS-based beamformer demonstrates the advantages of fast convergence speed, insensitivity to dynamic estimate modeling error, less computational load, and ...
openaire   +1 more source

A class of diagonally loaded robust Capon beamformers for noncircular signals of interest

Signal Processing, 2014
Diagonal loading is a simple and effective method for robustness enhancement of the Capon beamformer against perturbation in the presumed steering vector of the signal-of-interest (SOI). However, the determination of an appropriate diagonal loading level is not a trivial task.
Yougen Xu, Jingyan Ma, Zhiwen Liu, Wei Liu 0001   +3 more
openaire   +2 more sources

Statistical performance of the MVDR beamformer in the presence of diagonal loading

Proceedings of the 2000 IEEE Sensor Array and Multichannel Signal Processing Workshop. SAM 2000 (Cat. No.00EX410), 2002
New results are derived that describe the statistical performance of the MVDR (minimum variance distortionless response) adaptive beamformer when the weights are computed utilizing the sample covariance matrix and diagonal loading. It is well known that undesirably high sidelobes are generated when the unaugmented sample covariance matrix is used as an
openaire   +1 more source

Closed-form Pd expression for diagonally-loaded GLRT

IEEE Transactions on Aerospace and Electronic Systems, 2007
The recent paper by Shnidman [1] introduced two new models for radar target fluctuation. One of them is the noncentral gamma-gamma (NCGG) distribution, specified by a density function expressed as an infinite sum. It is shown here that one can actually derive an expression for the density in terms of the confluent hypergeometric function.
openaire   +1 more source

Improving the STAP Performance via Diagonal Loading

Journal of Electronics & Information Technology, 2011
Cong-feng Liu, Gui-sheng Liao
openaire   +1 more source

Beamforming technique based on adaptive diagonal loading in wireless access networks

Ad Hoc Networks, 2020
Jiaqi Zhen
exaly