Results 11 to 20 of about 336,461 (224)
A New Class of Broadband Arrays With Frequency Invariant Beam Patterns [PDF]
, 2004 In this paper, a new class of broadband arrays with frequency-invariant beam pattern is proposed. By suitable substitutions, the beam pattern of a continuous sensor array with continuous temporal processing can be regarded as the Fourier transform of its
S. Weiss +5 more
core +5 more sources
An omega‐k algorithm for multireceiver synthetic aperture sonar
Electronics Letters, 2023 In this Letter, the authors present a novel imaging algorithm for multireceiver synthetic aperture sonar (SAS). The Loffeld's bistatic formula (LBF) including quasi‐monostatic (QM) and multireceiver deformation (MD) phases is first reformulated into ...
Xuebo Zhang, Peixuan Yang, Haixin Sun
doaj +1 more source
Two-dimensional patterns with distinct differences; constructions, bounds, and maximal anticodes [PDF]
, 2010 A two-dimensional (2-D) grid with dots is called a configuration with distinct differences if any two lines which connect two dots are distinct either in their length or in their slope.
Etzion, T. +3 more
core +1 more source
Improved high-precision approach based on deconvolution in MIMO sonar imagery
The Journal of Engineering, 2019 Multiple-input multiple-output (MIMO) sonar enables high-resolution imaging, which is extremely useful in underwater acoustic high-precision imagery.
Lu Yan, Shengchun Piao, Feng Xu
doaj +1 more source
Reflections on “Parametric acoustic array,” source of virtual-array sonars [PDF]
The Journal of the Acoustical Society of America, 2021 The Reflections series takes a look back on historical articles from The Journal of the Acoustical Society of America that have had a significant impact on the science and practice of acoustics.
openaire +3 more sources
Coherent and Noncoherent Joint Processing of Sonar for Detection of Small Targets in Shallow Water
Sensors, 2018 A coherent-noncoherent joint processing framework is proposed for active sonar to combine diversity gain and beamforming gain for detection of a small target in shallow water environments.
Xiang Pan +5 more
doaj +1 more source
Sensors, 2020 Sonars are essential for underwater sensing as they can operate over extended ranges and in poor visibility conditions. The use of a synthetic aperture is a popular approach to increase the resolution of sonars, i.e., the sonar with its N transducers is ...
Heiko Bülow, Andreas Birk
doaj +1 more source
Measuring of False Peaks Occurring via Planar Antenna Arrays DOA Estimation
International Journal of Advances in Telecommunications, Electrotechnics, Signals and Systems, 2017 Direction-of-arrival (DOA) of radio signals takes a great scientific interest for radar, sonar and wireless communication tasks. In this paper the problem of DOA estimation methods for circular and concentric circular antenna arrays is considered.
Yuri B. Nechaev, Ilia W. Peshkov
doaj +1 more source
A review of Costas arrays [PDF]
, 2006 Costas arrays are not only useful in radar engineering, but they also present many interesting, and still open, mathematical problems. This work collects in it all important knowledge about them available today: some history of the subjects, density ...
Drakakis, Konstantinos +1 more
core +1 more source
An ADS-Based Sparse Optimization Method for Sonar Imaging Sensor Arrays
Applied Sciences, 2020 The Mills Cross sonar sensor array, achieved by the virtual element technology, is one way to build a low-complexity and low-cost imaging system while not decreasing the imaging quality.
Jiancheng Liu +3 more
doaj +1 more source