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Positioning Based on Signals of Opportunity
IEEE Communications Letters, 2014A novel approach to opportunistic positioning based on timing measurements is presented. The asynchronous radio transmissions from fixed stations and from mobile GPS-equipped nodes are jointly exploited to cooperatively localize a blind node. To this end, a weighted least-squares (WLS) estimator is proposed; its effectiveness is illustrated via ...
COLUCCIA, ANGELO +2 more
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Mobile Communication Signal Selection Algorithm for Signal of Opportunity Navigation
2021 23rd International Conference on Advanced Communication Technology (ICACT), 2021At present, the satellite navigation and positioning system can provide a high precision positioning service to end users in outdoor environments. But in urban canyons, high-rise buildings, urban tunnels, tree canopy covered areas, and other environments with weak signal such as military base and other special places with signal disturbance or spoofery,
Huijie Zhu +5 more
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Mobile Positioning with Signals of Opportunity in Urban and Urban Canyon Environments
2020 IEEE/ION Position, Location and Navigation Symposium (PLANS), 2020This paper presents field test results of mobile positioning with signals of opportunity (SOOP) in urban and urban canyon environments and the lessons learned. The particular SOOP considered in this paper is the digital television (DTV) signals available
Chun Yang, A. Soloviev
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Blind Opportunistic Navigation: Cognitive Deciphering of Partially Known Signals of Opportunity
Proceedings of the 33rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2020), 2020A blind opportunistic navigation (BON) framework is proposed. This framework deciphers partially known signals of opportunity (SOPs) in a cognitive fashion.
M. Neinavaie, Joe J. Khalife, Z. Kassas
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Modeling the Coherence of Scattered Signals of Opportunity
IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium, 2019The reflection of radar echoes collected under both monostatic and bistatic configurations generally undergoes losses of coherence. These can be affected by many factors, depending on both the system features and the illuminated surface, and it should be properly considered for an accurate characterization of the scattering phenomenon.
Comite D. +3 more
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Performance considerations for positioning with signals of opportunity
2016 International Conference on Localization and GNSS (ICL-GNSS), 2016This paper presents a study on the benefit of observing several signals of opportunity for positioning purposes. Several static emitters are placed over a defined area where an user is moving and acquiring measurements to each of these emitters. The simulation considers that the user is capable of acquiring time of arrival measurements from several ...
Pedro Figueiredo e Silva +1 more
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Signals or Mixed Signals: Why Opportunities for Mobilization are not Opportunities for Policy Reform
Mobilization: An International Quarterly, 2007Drawing on political opportunity theory, the theory of legislative logic, and political mediation theory, we hypothesize differential effects of the political environment on the actions of challengers (suffragists) and state actors (legislators) in the women's suffrage movement. We use sequential logistic regression to assess the effects of explanatory
Marie Cornwall +4 more
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3-D Indoor Positioning Based on Passive Radio Frequency Signal Strength Distribution
IEEE Internet of Things Journal, 2023In recent years, indoor positioning systems (IPSs) have received attention from many research fields, such as robotics, navigation, human–computer interaction, etc. However, IPS based on passive radio frequency (PRF) technology is still rare.
Liangqi Yuan +4 more
semanticscholar +1 more source
Hypoxia signaling: Challenges and opportunities for cancer therapy
Seminars in Cancer Biology, 2022Hypoxia is arguably the first recognized cancer microenvironment hallmark and affects virtually all cellular populations present in tumors. During the past decades the complex adaptive cellular responses to oxygen deprivation have been largely elucidated, raising hope for new anti cancer agents.
Mircea Ivan +5 more
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Signaling, Investment Opportunities, and Dividend Announcements
Review of Financial Studies, 1995This article examines potential explanations for the wealth effects surrounding dividend change announcements. We find that new information concerning managers' investment policies is not revealed at the time of the dividend announcement. We also find that dividend increases (decreases) are associated with subsequent significant increases (decreases ...
Yoon, Pyung Sig, Starks, Laura T
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