Results 11 to 20 of about 284 (118)

Differential Signals-of-Opportunity Timing Back-Up Method on VHF Band for Critical Infrastructures

IEEE Access
This paper describes a back-up method for GNSS-free timing for power lines which is currently achieved using fibre links. The method is based on software-defined-radio technologies for monitoring low-frequency signals of opportunity (SoOp) serving as an ...
Martta-Kaisa Olkkonen, Maija Makela, Sanna Kaasalainen   +2 more
doaj   +2 more sources

ANALYTICAL KIRCHHOFF SOLUTIONS (AKS) AND NUMERICAL KIRCHHOFF APPROACH (NKA) FOR FIRST-PRINCIPLE CALCULATIONS OF COHERENT WAVES AND INCOHERENT WAVES AT P BAND AND L BAND IN SIGNALS OF OPPORTUNITY (SOOP) [PDF]

Progress In Electromagnetics Research, 2021
In this paper, we derived Analytical Kirchhoff Solutions (AKS) for bistatic scattering near the specular directions at P band and L band for applications in Signals of Opportunity (SoOp). The land surface profiles are divided into three scales: microwave
Bowen Ren, Jiyue Zhu, Leung Tsang, Haokui Xu   +3 more
openaire   +2 more sources

Sensing Lunar Dust Density Using Radio Science Signals of Opportunity

Remote Sensing
Previous lunar missions, such as Surveyor, Apollo, and the Lunar Atmosphere and Dust Environment Explorer (LADEE), have played a pivotal role in advancing our understanding of the lunar exosphere’s dynamics and its relationship with solar wind flux.
Kamal Oudrhiri, Yu-Ming Yang, Daniel Erwin   +2 more
doaj   +2 more sources

SNOOPI: Demonstrating Earth remote sensing using P-band signals of opportunity (SoOp) on a CubeSat

Advances in Space Research, 2023
James L. Garrison, Manuel A. Vega, Rashmi Shah, Justin R. Mansell, Benjamin Nold, Juan Raymond, Roger Banting, Rajat Bindlish, Kameron Larsen, Seho Kim, Weihang Li, Mehmet Kurum, Jeffrey Piepmeier, Hasnaa Khalifi, Forrest A. Tanner, Kevin Horgan, Chase E. Kielbasa, Sachidananda R. Babu   +17 more
openaire   +2 more sources

Wetland monitoring with Global Navigation Satellite System reflectometry. [PDF]

Earth Space Sci, 2017
Abstract Information about wetland dynamics remains a major missing gap in characterizing, understanding, and projecting changes in atmospheric methane and terrestrial water storage. A review of current satellite methods to delineate and monitor wetland change shows some recent advances, but much improved sensing technologies are still needed for ...
Nghiem SV, Zuffada C, Shah R, Chew C, Lowe ST, Mannucci AJ, Cardellach E, Brakenridge GR, Geller G, Rosenqvist A.   +9 more
europepmc   +2 more sources

Ambiguity function analysis of iridium burst transmissions for opportunistic navigation

Electronics Letters, Volume 59, Issue 21, November 2023., 2023
The objective of this work is to investigate the Ambiguity Function (AF) characterization of the Iridium L‐band downlink burst transmissions under single burst and multiband multi‐burst mode to demonstrate its suitability and capability as Signal of OPportunity (SoOP) for navigation.
Ruidan Luo, Xiao Chen, Zhongwang Wu, Yaping Li   +3 more
wiley   +1 more source

The Impact of Zooplankton Calcifiers on the Marine Carbon Cycle

Global Biogeochemical Cycles, Volume 37, Issue 6, June 2023., 2023
Abstract Shelled pteropods and planktic foraminifers are calcifying zooplankton that contribute to the biological carbon pump via the sinking of their calcareous shells. However, their importance for regional and global plankton biomass and carbon fluxes is not well understood.
Nielja S. Knecht, Fabio Benedetti, Urs Hofmann Elizondo, Nina Bednaršek, Sonia Chaabane, Catharina de Weerd, Katja T. C. A. Peijnenburg, Ralf Schiebel, Meike Vogt   +8 more
wiley   +1 more source

Inorganic Carbon Transport and Dynamics in the Florida Straits

Journal of Geophysical Research: Oceans, Volume 127, Issue 10, October 2022., 2022
Abstract Ocean heat and carbon are transported through the Florida Straits, contributing to the Atlantic Meridional Overturning Circulation, and playing an important role in climate. Insufficient observations of carbonate chemistry within the Florida Straits have limited our understanding of ocean acidification within this region.
Yuan‐Yuan Xu, Rik Wanninkhof, Emily Osborne, Molly Baringer, Leticia Barbero, Wei‐Jun Cai, James Hooper   +6 more
wiley   +1 more source

Designing Sustainable Recovery Network of End‐of‐Life Product during the COVID‐19 Pandemic: A Real and Applied Case Study

Discrete Dynamics in Nature and Society, Volume 2022, Issue 1, 2022., 2022
One of the most important aspects of supply chain management (SCM) is the recovery network (RN), which covers all activities associated with return products (such as collection, recovery, repair, recycling, and waste disposal). Our goal in this paper is to provide a new mathematical model of sustainable end‐of‐life management (SEOLM) during the COVID ...
Sina Abbasi, Maryam Daneshmand-Mehr, Armin Ghane Kanafi, Reza Lotfi   +3 more
wiley   +1 more source

Reduced Ocean Carbon Sink in the South and Central North Sea (2014–2018) Revealed From FerryBox Observations

Geophysical Research Letters, Volume 48, Issue 11, 16 June 2021., 2021
Abstract Surface seawater carbon dioxide partial pressure (pCO2) in the south‐central North Sea was measured between 2014 and 2018 using FerryBox‐integrated membrane sensors on ships‐of‐opportunity. Average annual pCO2 variability was biologically controlled, with thermal effects modulating its amplitude.
V. A. Macovei, W. Petersen, H. Brix, Y. G. Voynova   +3 more
wiley   +1 more source