Results 81 to 90 of about 23,037 (220)
, 2014 In many practical problems it is not necessary to compute the DFT in a perfect manner including some radar problems. In this article a new multiplication free algorithm for approximate computation of the DFT is introduced. All multiplications $(a\times b)
Akbas, Cem Emre +4 more
core +1 more source
Marine Mammal Science, Volume 42, Issue 2, April 2026.ABSTRACT We compiled 46 years of cetacean strandings in the Algarve, Portugal, describing temporal–spatial patterns, size–sex structure, and causes of death (COD). We analyzed national records and years with a dedicated regional stranding network (SN) to assess annual/seasonal trends, spatial hotspots, and compare biometrics and COD.
Jan Hofman +7 more
wiley +1 more source
Visualisation forms in passive sonar with towed array
Archives of Acoustics, 2014 This paper presents forms of visualisation used in modern underwater systems, a topic covered at two previous Seminars. This year’s presentation describes how imaging is organised on the monitors of a passive sonar with a long acoustic array, towed ...
A. Raganowicz +4 more
doaj
Machine Learning Ship Classifiers for Signals from Passive Sonars
Applied SciencesThe accurate automatic classification of underwater acoustic signals from passive SoNaR is vital for naval operational readiness, enabling timely vessel identification and real-time maritime surveillance.
Allyson A. da Silva +2 more
doaj +1 more source
Underwater Acoustic Research Trends with Machine Learning: Passive SONAR Applications
한국해양공학회지, 2020 Underwater acoustics, which is the domain that addresses phenomena related to the generation, propagation, and reception of sound waves in water, has been applied mainly in the research on the use of sound navigation and ranging (SONAR) systems for ...
Haesang Yang +3 more
doaj +1 more source
Resolution capabilities of passive sonar receiving arrays [PDF]
The Journal of the Acoustical Society of America, 1975 Resolution is defined as a binary hypothesis test or detection problem using the formulation of Rockmore and Bershad [J. Acoust. Soc. Am. 58, 684–692 (1975).] The formulation assumes Gaussian random signal and noise. The sufficient statistic, from the likelihood ratio, is compared with a threshold to determine whether the signal is from one or two ...
openaire +1 more source
BTSTNet: A Beamforming-Based Target Separation Transformer Network for Passive SONAR
IEEE AccessPassive SONAR has attracted significant attention in covert operations, enabling vessel detection and classification through spectrogram analysis of received signals without active transmission. However, in realistic ocean environments, interference from
Yeonbi Jeong +4 more
doaj +1 more source
Journal of Marine Science and Engineering, 2019 Capon beamforming is often applied in passive sonar to improve the detectability of weak underwater targets. However, we often have no accurate prior information of the direction-of-arrival (DOA) of the target in the practical applications of passive ...
Yu Hao, Nan Zou, Guolong Liang
doaj +1 more source
Socionic Multi-Agent Systems Based on Reflexive Petri Nets and Theories of Social Self-Organisation [PDF]
This contribution summarises the core results of the transdisciplinary ASKO project, part of the German DFG's programme Sozionik, which combines sociologists' and computer scientists' skills in order to create improved theories and models of artificial ...
Daniel Moldt +5 more
core
Sea ice-atmosphere interaction: Application of multispectral satellite data in polar surface energy flux estimates [PDF]
The application of multi-spectral satellite data to estimate polar surface energy fluxes is addressed. To what accuracy and over which geographic areas large scale energy budgets can be estimated are investigated based upon a combination of available ...
Barry, R. +5 more
core +4 more sources