Results 61 to 70 of about 8,425 (174)

Location errors in time of arrival (TOA) and time difference of arrival (TDOA) systems [PDF]

, 1977
It is shown that the covariance matrix of object location errors is identical for time of arrival (TOA) and time difference of arrival (TDOA) systems if the inverse of the covariance matrix of TOA (TDOA) errors is used as a weighting matrix. Also, with this weighting the location errors statistics do not depend on the particular difference pairs in the
openaire   +2 more sources

Seismo‐Acoustic Detection and Localization of Iceberg Collapse in Atka Bay, Antarctica

Geophysical Research Letters, Volume 52, Issue 23, 16 December 2025.
Abstract On 12 January 2022, an iceberg collapsed at the edge of frozen Atka Bay, Antarctica. The event generated seismic, hydroacoustic, and atmospheric infrasound waves recorded by a local network comprising land‐ and iceshelf‐based seismometers, an underwater hydrophone, and an on‐ice infrasound array.
G. Averbuch, A. Houstin, D. P. Zitterbart, J. Bonnel, J. A. Collins, J. D. Assink   +5 more
wiley   +1 more source

Experimental studies on multi‐scale data‐driven methods within the framework of structural health monitoring

Civil Engineering Design, Volume 7, Issue 4, Page 147-168, December 2025.
Abstract The German Research Foundation has established the priority program SPP 100+. Its subject is monitoring bridge structures in civil engineering. The data‐driven methods cluster deals with the use of measurements and their special global and local analysis methods, which complement each other in an overall multi‐scale concept in order to realize
Maximilian Rohrer, Jan Backhaus, Ulf Bestmann, Vanessa De Arriba López, Pedro Achanccaray Diaz, Markus Gerke, Carsten Könke, Armin Lenzen, Lukas Lippold, Mehdi Maboudi, Max Moeller, Carlos Luis Paz Villegas, Paul Winkler, Volkmar Zabel   +13 more
wiley   +1 more source

Automatic Analysis of Hydroacoustic Signals Related to the Activity of the Fani Maoré Submarine Volcano

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 12, December 2025.
Abstract Due to the properties of sound propagation underwater, including the existence of the SOFAR channel, sounds in the ocean can propagate over large distances with little attenuation. This makes passive acoustics a relevant method for monitoring natural events such as ice calving, earthquakes, and underwater volcanic eruptions.
Pierre‐Yves Raumer, Sara Bazin, Romain Safran, Dorian Cazau, Jean‐Yves Royer   +4 more
wiley   +1 more source

Improvement of the Time Difference of Arrival (TDOA) Estimation of GSM Signals Using Wavelets

, 2000
Abstract : The problem of localization of wireless emitters (GSM based) using time difference of arrival (TDOA) techniques is studied. The wavelet transform and denoising techniques are used to increase the accuracy of the TDOA estimate. GSM like signals are simulated using the Hewlett-Packard Advanced Designs System (HP-ADS) software.
Tri T. Ha, Timothy Haney, Ralph D. Hippenstiel   +2 more
openaire   +3 more sources

Distributed localization of a RF target in NLOS environments

, 2014
We propose a novel distributed expectation maximization (EM) method for non-cooperative RF device localization using a wireless sensor network. We consider the scenario where few or no sensors receive line-of-sight signals from the target. In the case of
Leng, Mei, Quitin, Francois, Razul, Sirajudeen G., Tay, Wee Peng, Xu, Wenjie   +4 more
core   +1 more source

A General Bayesian Framework for Ellipse-based and Hyperbola-based Damage Localisation in Anisotropic Composite Plates [PDF]

, 2015
This paper focuses on Bayesian Lamb wave-based damage localization in structural health monitoring of anisotropic composite materials. A Bayesian framework is applied to take account for uncertainties from experimental time-of-flight measurements and ...
FENDZI, Claude, GUSKOV, Mikhail, MECHBAL, Nazih, REBILLAT, Marc   +3 more
core   +3 more sources

Inferring activity patterns of aquatic animals from single‐receiver acoustic telemetry setups

Methods in Ecology and Evolution, Volume 16, Issue 12, Page 2931-2944, December 2025.
Abstract Acoustic telemetry has become an essential tool for studying activity patterns of animals in aquatic environments. Activity is typically recorded using transmitters with integrated sensors or dense receiver arrays for positional tracking. While effective, these approaches are financially and logistically expensive due to the need for advanced ...
Eneko Aspillaga, Josep Alós, Ignacio A. Catalán, Vicenç Moltó, Jordi Abad‐Platas, David Villegas‐Ríos   +5 more
wiley   +1 more source

M‐SADR: Mobile Self Adaptive Data Rate for Enhanced LoRa End‐Device Connectivity on the Move

International Journal of Communication Systems, Volume 38, Issue 15, October 2025.
The proposed M‐SADR method targets mobile LoRa end‐devices and achieves better performance, with a 2.4% improvement in packet delivery ratio and a 5.7% reduction in power consumption per successfully delivered packet. ABSTRACT Mobility is a critical aspect of the Internet of Things, reflecting the diverse and dynamic nature of potential applications ...
Vasileios Moysiadis, Panagiotis Radoglou‐Grammatikis, Evangelos Mourikis, Maria Zevgara, Dimitrios N. Skoutas, Charalabos Skianis, Panagiotis Sarigiannidis   +6 more
wiley   +1 more source

Outbreak of Gigantic Jets Over an Isolated Thunderstorm in South China

Earth and Space Science, Volume 12, Issue 10, October 2025.
Abstract On the evening of 18 August 2022, a sequence of five gigantic jets (GJs) were recorded within 7 min over an isolated coastal thunderstorm approximately 170 km to the southwest of Luoding County, Guangdong Province of China. The thunderstorm exhibited a higher −10°C isotherm altitude (500 m above average), a significant CAPE value (∼2,158 J/kg),
Yiwei Zhao, Gaopeng Lu, Hailiang Huang, Jixin Wang, Feifan Liu, Zhengwei Cheng, Renjun Zhou, Yazhou Chen, Baoyou Zhu, Hui Li, Xiaoyang Zhang   +10 more
wiley   +1 more source