Results 81 to 90 of about 4,885,884 (343)
Introducing relativity in global navigation satellite systems
Annalen der Physik, 2007 AbstractToday, the Global Navigation Satellite Systems, used as global positioning systems, are the GPS and the GLONASS. They are based on a Newtonian model and hence they are only operative when several relativistic effects are taken into account. The most important relativistic effects (to order 1/c2) are: the Einstein gravitational blue shift effect
openaire +2 more sources
Cooperative monocular-based SLAM for multi-UAV systems in GPS-denied environments [PDF]
, 2018 This work presents a cooperative monocular-based SLAM approach for multi-UAV systems that can operate in GPS-denied environments. The main contribution of the work is to show that, using visual information obtained from monocular cameras mounted onboard ...
Grau Saldes, Antoni +3 more
core +3 more sources
Molecular Oncology, EarlyView.Dormant cancer cells can hide in distant organs for years, evading treatment and the immune system. This review highlights how signals from the surrounding tissue and immune environment keep these cells inactive or trigger their reawakening. Understanding these mechanisms may help develop therapies to eliminate or control dormant cells and prevent ...
Kanishka Tiwary +1 more
wiley +1 more source
GPS-Based Relative Navigation for Laser Crosslink Alignment in the VISION CubeSat Mission
AerospaceAs the demand for high-speed space-borne data transmission grows, CubeSat-based Free-Space Optical Communication (FSOC) offers a viable solution for achieving a Gbps-speed optical intersatellite link on low-cost platforms.
Yeji Kim +4 more
doaj +1 more source
Aircraft approach guidance using relative Loran-C navigation [PDF]
The experiments carried out at MIT during 1984 focussed on two aspects of Loran-C relative navigation that would impact system performance at the sub-microsecond level of accuracy: tracking loop bandwidth and localized field deformation.
Elias, Antonio L.
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Validation on flight data of a closed-loop approach for GPS-based relative navigation of LEO satellites [PDF]
, 2013 This paper describes a carrier-phase differential GPS approach for real-time relative navigation of LEO satellites flying in formation with large separations.
Grassi M, Renga A, Tancredi U
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Molecular Oncology, EarlyView.Radiotherapy (RT) response depends on the DNA repair capacity of tumor and host cells. We show that circulating tumor cell (CTC) counts and apoptosis rates before and after RT predict treatment response and outcome, which can be accessed via easily accessible liquid biopsy approaches. Created in BioRender. Wikman, H.
Yvonne Goy +10 more
wiley +1 more source
Observability and Information Bounds in UUV Relative Navigation from Range-Rate
Applied SciencesIn this paper, we investigate the relative navigation of two underwater vehicles in a leader–follower configuration when the only available inter-vehicle acoustic measurement is Doppler-derived range-rate, i.e., the rate of change in range, with no ...
Łukasz Marchel
doaj +1 more source
A multi-sensor optical relative navigation system for small satellite servicing
Acta Astronautica, 2023 Giuseppe Napolano +4 more
semanticscholar +1 more source
NASA Johnson Space Center Mini AERCam texting with the GSS6560 [PDF]
, 2004 GPS based programs at NASA-JSC are enumerated on page 1: Several Detailed Test Objectives (DTOs) flown on STS missions featuring GPS are the primary focus of the DTO: GANE on STS-77, RGPS RME on STS-80, ARPK on STS-84 & STS-86, SIGI DTOs on STS-88, STS ...
Cryan, Scott P.
core +1 more source