Results 21 to 30 of about 174,298 (206)
Doppler Differential Positioning Technology Using the BDS/GPS Indoor Array Pseudolite System
Sensors, 2019 A Global Satellite Navigation System (GNSS) cannot provide normal location services in an indoor environment because the signals are blocked by buildings.
Xingli Gan +7 more
doaj +1 more source
A Non-Linear Filtering Algorithm Based on Alpha-Divergence Minimization
Sensors, 2018 A non-linear filtering algorithm based on the alpha-divergence is proposed, which uses the exponential family distribution to approximate the actual state distribution and the alpha-divergence to measure the approximation degree between the two ...
Yarong Luo +3 more
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Accurate and automatic NOAA-AVHRR image navigation using a global contour matching approach [PDF]
, 2000 The problem of precise and automatic AVHRR image navigation is tractable in theory, but has proved to be somewhat difficult in practice. The authors' work has been motivated by the need for a fully automatic and operational navigation system capable of ...
Eugenio, F +4 more
core +1 more source
A Comprehensive Signal Quality Assessment for BDS/Galileo/GPS Satellites and Signals
Remote SensingWith the modernization of global navigation satellite systems (GNSS), especially the rapid development of the BeiDou Navigation Satellite System (BDS), more observations of satellites and signals have become available.
Yijun Tian +10 more
doaj +1 more source
Global Navigation Satellite System Spoofing Detection in Inertial Satellite Navigation Systems
Inventions, 2023 The susceptibility of global navigation satellite systems (GNSSs) to interference significantly limits the possibility of their use. From the standpoint of possible consequences, the most dangerous interference is the so-called spoofing. Simultaneously, in most cases of GNSS use, an inertial navigation system (INS) or an attitude and heading reference ...
Maksim Zharkov +3 more
openaire +2 more sources
IEEE Access, 2020 In Wi-Fi fingerprint positioning, what we should most care about is the distance relationship between the user and the reference points (RP). However, most of the existing weighted k-nearest neighbor (WKNN) algorithms use the Euclidean distance of ...
Boyuan Wang +6 more
doaj +1 more source
Precise Orbit Determination of LEO Satellite Using Dual-Frequency GPS Data [PDF]
Journal of Astronomy and Space Sciences, 2009 KOrea Multi-purpose SATellite (KOMPSAT)-5 will be launched at 550km altitude in 2010. Accurate satellite position (20 cm) and velocity (0.03 cm/s) are required to treat highly precise Synthetic Aperture Radar (SAR) image processing.
Yoola Hwang +3 more
doaj +1 more source
Upper-bounding bias errors in satellite navigation
, 2014 A satellite navigation system for a safety critical application is required to provide an integrity alert of any malfunction; the probability that a navigation positioning error exceeds a given alert limit without an integrity alert is required to be ...
Iwamoto, Takashi
core +1 more source
Chaotic transport of navigation satellites [PDF]
Chaos: An Interdisciplinary Journal of Nonlinear Science, 2019 Navigation satellites are known from numerical studies to reside in a dynamically sensitive environment, which may be of profound importance for their long-term sustainability. We derive the fundamental Hamiltonian of Global Navigation Satellite System dynamics and show analytically that near-circular trajectories lie in the neighborhood of a Normally ...
Ioannis Gkolias +4 more
openaire +3 more sources
TEMPUS: A proposal for international time transfer and precision tracking satellite [PDF]
, 1979 Very Long Baseline Interferometry (pulsars), Television relay via satellite, portable clocks, Navigation Technology Satellite, and Loran C are described and ...
Holmes, D. C.
core +1 more source