Results 51 to 60 of about 5,786 (208)
Kogia Records in Brazilian Equatorial and Southwestern Atlantic Oceans
Marine Mammal Science, Volume 42, Issue 4, October 2026.ABSTRACT The pygmy (Kogia breviceps) and dwarf (Kogia sima) sperm whales are cryptic cetaceans characterized by inconspicuous surfacing behavior, small group sizes, and deep‐diving habits, making visual detection particularly challenging. Here, we present the first broad‐scale passive acoustic monitoring (PAM) assessment of Kogia spp.
Joao Pedro M. Mura +12 more
wiley +1 more source
Initial Relative Orbit Determination Using Heterogeneous TDOA
, 2017 This paper presents a solution for the initial orbit determination of a space-based RF transmitter using time-difference-of-arrival (TDOA) measurements obtained from space-based receivers in known orbits. Orbit determination requires six independent TDOA
Sinclair, Andrew J. +5 more
core +1 more source
Applied Sciences, 2022 Currently, the performance analysis of positioning algorithms and optimization of ground station deployment schemes are predominantly based on pure TOA or TDOA measurement information, and the relevant theoretical analysis is primarily the geometric ...
Guoning Ma +6 more
doaj +1 more source
Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.Abstract Doppler frequency shifts (DFSs) recorded by continuous wave‐high frequency Doppler sounding systems and ionograms observed by five ionosondes in Taiwan and Japan are used to study three‐dimensionally seismo‐ and tsunami‐traveling ionospheric disturbances (STIDs and TTIDs) triggered by the 29 July 2025 Mw8.8 Kamchatka earthquake.
Yao‐Chun Chen +9 more
wiley +1 more source
Research of underground positioning algorithm based on DOA and TDOA
Gong-kuang zidonghua, 2013 In view of problems that current underground positioning system is sensitive to environmental change and has low positioning accuracy, the paper introduced an underground positioning algorithm based on DOA and TDOA. The algorithm takes advantages of high
ZHAI Yan-rong +5 more
doaj +1 more source
Intelligent Acousto‐Electrical Metamaterials (IAM) for Sound Source Detection
Advanced Materials, Volume 38, Issue 36, 26 June 2026.Our proposed metamaterial concept enables sound source detection using a single material, in contrast to conventional arrays that require dozens or even hundreds of transducers. We show that the coupled acoustic–vibrational–electrical responses in piezoelectric metamaterials give rise to topology‐governed charge transport, producing distinct voltage ...
Victor Couëdel +7 more
wiley +1 more source
TDOA-Based Localization System with Narrow-band Signals [PDF]
, 2013 This paper gives a general overview of the challenges that arise in using narrow-band signals, such as GSM, for localisation based on the time properties of the signal. Specifically, synchronisation and retrieving of time information are addressed.
Dimitrova, D. C., Braun, T., Li, Z.
core +1 more source
Two-dimensional precise positioning method of coal mine field personnel
Meikuang Anquan, 2023 Aiming at the slow speed of two-dimensional accurate positioning of TOF in coal mine sites, a two-dimensional positioning method based on TOF combined with TDOA was proposed to meet the needs of rapid localization in coal mine sites.
WEN Xianpei
doaj +1 more source
Prioritising research on endocrine disruption in the marine environment: a global perspective
Biological Reviews, Volume 101, Issue 2, Page 848-868, April 2026.ABSTRACT A healthy ocean is a crucial life support system that regulates the global climate, is a source of oxygen and supports major economic activities. A vast and understudied biodiversity from micro‐ to macro‐organisms is integral to ocean health.
Patricia I. S. Pinto +23 more
wiley +1 more source