Results 21 to 30 of about 249,513 (267)
The improvement of fiber-detection method to enhance the output of amplify-received relaying on FSO communications [PDF]
International Journal of Electronics and Telecommunications, 2023 The performance of free-space optical (FSO) communications that using an optical amplifier (OA) in the scheme of an amplify-received (AR)-relaying has a major drawback in the detection of input signal quality under the effects of turbulence.
Ucuk Darusalam +3 more
doaj +1 more source
Signals Of Opportunity In Mobile Radio Positioning
, 2012 Publication in the conference proceedings of EUSIPCO, Bucharest, Romania ...
Dammann, Armin +2 more
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Sensors, 2013 Since Global Navigation Satellite Systems (GNSS) show degraded performance in dense urban and indoor areas, a positioning sensor based on Digital Video Broadcast-Terrestrial (DVB-T) systems is presented in this paper.
Letizia Lo Presti +2 more
doaj +1 more source
Performance considerations for positioning with signals of opportunity
2016 International Conference on Localization and GNSS (ICL-GNSS), 2016 This 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 ...
Lohan Elena-Simona +1 more
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Remote SensingSignal-of-Opportunity (SOP) positioning based on Low-Earth-Orbit (LEO) constellations has gradually become a research hotspot. Due to their large quantity, wide spectral coverage, and strong signal power, LEO satellite SOP positioning exhibits robust ...
Lihao Yao +14 more
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Positioning Using IRIDIUM Satellite Signals of Opportunity in Weak Signal Environment [PDF]
Electronics, 2019 In order to get rid of the dependence of the navigation and positioning system on the global navigation satellite system (GNSS), radio, television, satellite, and other signals of opportunity (SOPs) can be used to achieve receiver positioning. The space-based SOPs based on satellites offer better coverage and availability than ground-based SOPs.
Zizhong Tan +3 more
openaire +1 more source
Analysis of Instantaneous Doppler Positioning Performance Based on LEO Satellite Ephemeris Errors
Remote SensingTo address the limitations of Global Navigation Satellite Systems (GNSSs), such as vulnerability to electromagnetic interference and weak ground signal power, signal of opportunity (SOP) provided by low Earth orbit (LEO) satellites can serve as a backup ...
Xingyu Shi +8 more
doaj +1 more source
Pediatric Blood &Cancer, EarlyView.ABSTRACT Introduction Adolescent siblings of children with cancer are at elevated risk for psychosocial problems. Unfortunately, various barriers such as limited family time and resources, conflicting schedules, and psychosocial staffing constraints at cancer centers hinder sibling access to support.
Christina M. Amaro +10 more
wiley +1 more source
Sensors, 2020 In airborne passive bistatic radar (PBR), the reference channel toward the opportunity illuminator is applied to receive the direct-path signal as the reference signal. In the actual scenario, the reference signal is contaminated by the multipath signals
Shuai Guo, Jun Wang, Hui Ma, Jipeng Wang
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Contributions to Geophysics and Geodesy, 2021 Hydrometeors (rain, fog and ice crystals) affect the transmission of electromagnetic signals. Previous research showed that alterations in the signal (amplitude and phase) are affected by the composition of the atmosphere, e.g.
Peter FABO +4 more
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