Results 121 to 130 of about 5,081,602 (245)

A Constant False Alarm Rate Detection Method for Sonar Imagery Targets Based on Segmented Ordered Weighting

Journal of Marine Science and Engineering
Achieving reliable target detection in the field of sonar imagery represents a significant challenge due to the complex underwater interference patterns characterized by speckle noise, tunnel effects, and low-signal-to-noise ratio (SNR) environments ...
Wankai Na, Haisen Li, Jian Wang, Jiani Wen, Tianyao Xing, Yuxia Hou   +5 more
doaj   +1 more source

Evaluation‐Constrained Projections Reveal a Potentially Navigable Arctic by the 2030s

Geophysical Research Letters, Volume 53, Issue 21, 16 November 2026.
Abstract The rapid decline in Arctic sea ice thickness (SIT) is reshaping Arctic navigation prospects. However, large uncertainties in climate model skill hinder robust projections of future navigability. Here we evaluate SIT simulated by the CMIP6 using satellite, airborne, reanalysis, and in situ data sets across freezing and melting seasons.
Yu Zhang, Changxing Li, Huan Li, Changsheng Chen, Weizeng Shao, Wenyun Guo, Yi Zhou   +6 more
wiley   +1 more source

Modulation, resolution and signal processing in radar, sonar and related systems

, 1966
Electronics and Instrumentation, Volume 35: Modulation, Resolution and Signal Processing in Radar, Sonar and Related Systems presents the practical limitations and potentialities of advanced modulation systems.
Benjamin, R, Fry, D W, Costrell, L
core  

Design and Implementation of an Automated Wheelchair With Voice and Gesture Control, Obstacle Avoidance, and Real‐Time Location Sharing

Engineering Reports, Volume 8, Issue 11, November 2026.
This work presents a standalone smart wheelchair featuring dual voice‐ and gesture‐based control, obstacle avoidance, and real‐time location sharing. The system achieves 100% gesture accuracy and 94% voice accuracy, enabling safe, independent mobility for users with severe physical impairments and providing emergency support without smartphone ...
Md Nurul Huda Rifat, S. M. Fatin Hasnat, Md. Habibur Rahman Aslam   +2 more
wiley   +1 more source

Optimization-Based Mismatched-Channel Filtering Using ADMM for Continuous Active Sonar

Journal of Marine Science and Engineering
Generalized Sinusoidal Frequency Modulation (GSFM) signals can enhance Continuous Active Sonar (CAS) performance by providing high sub-signal processing gain while achieving high target update rates.
Zitao Su, Juan Yang, Lu Yan
doaj   +1 more source

Widespread On‐Fault Geologic Evidence for Variable Mode Coseismic Slip to the Trench in Cascadia

AGU Advances, Volume 7, Issue 8, November 2026.
Abstract Investigating the geologic record of near‐trench coseismic strain release is critical for estimating the slip distribution and tsunamigenic potential of future large subduction zone earthquakes. However, the style and extent of upper plate coseismic deformation offshore in subduction zones is poorly constrained.
J. T. Watt, J. C. Hill, C. K. Paull, N. C. Miller, J. W. Kluesner, D. S. Brothers, D. W. Caress, A. Balster‐Gee, E. Lundsten, R. Gwiazda, J. B. Paduan, N. M. Nieminski   +11 more
wiley   +1 more source

IMPLEMENTATION OF FILTERING BEAMFORMING ALGORITHMS FOR SONAR DEVICES USING GPU

, 2013
Beamforming is a signal processing technique used in sensor arrays to direct signal transmission or reception. Beamformer combines input signals in the array to achieve constructive interference at particular angles (beams) and destructive interference ...
Kamali, Shahrokh
core  

WAH‐i: Optimising microphone array geometry for customised localisation accuracy

Methods in Ecology and Evolution, Volume 17, Issue 11, Page 3199-3219, November 2026.
Abstract Accurate spatial localisation of free‐flying echolocating bats is foundational for resolving fine‐scale flight and echolocation behaviour, prey interception and spatial decision‐making in natural environments. Acoustic localisation using microphone arrays is widely employed for this purpose, yet array geometries in field studies are typically ...
Ravi Umadi
wiley   +1 more source

Research on high-resolution processing of frequency modulation combined signal for active sonar detection

Frontiers in Physics
The Frequency Modulation Combined (FMC) waveform has delay (range)-Doppler (velocity) coupling resolution, and the traditional nonlinear high-resolution algorithms represented by Point-wise Product (PP) and Point-wise Minimization (PM) have good anti ...
Yaojun Jia, Pingbo Wang, Hongkai Wei, Qiang Chen, Yunhua Hu   +4 more
doaj   +1 more source

Behavioural Diversity of Fishes: Concepts, Drivers and Its Role in Conservation and Management

Fish and Fisheries, Volume 27, Issue 6, Page 1245-1268, November 2026.
ABSTRACT Human activity has altered nearly all ecosystems on Earth, contributing to substantial biodiversity loss across taxonomic, genetic and functional dimensions, from the intraspecific to the ecosystem scale. Yet some components of biodiversity remain hidden or underappreciated, including behavioural diversity.
Marie Prchalová, Robert Arlinghaus, Samuel Westrelin, Ivan Jarić, Michael G. Bertram, Josep Alós, Henrik Baktoft, Jack A. Brand, Tomas Brodin, Adolfo Cordero‐Rivera, Carlina Feldmann, Ryo Futamura, Stefan Hont, Pascal Klamser, Cecilie Iden Nilsen, Johann Mourier, Karl Øystein Gjelland, Esben Moland Olsen, Polona Pengal, Rubén Rabaneda‐Bueno, Milan Říha, Theresa Rueger, Holger Schielzeth, Marco Signaroli, Marija Smederevac‐Lalić, Christopher T. Monk   +25 more
wiley   +1 more source