Results 21 to 30 of about 318,817 (173)
Sensors, 2018 For ultra-rapid orbits provided by the Global Navigation Satellite System (GNSS), the key parameters, accuracy and timeliness, must be taken into consideration in real-time and near real-time applications.
Qianxin Wang, Chao Hu, Ya Mao
doaj +1 more source
Remote Sensing, 2019 This paper describes the sensitivity of both the orbital frame domain selection and the gravity model on the performance of on-board real-time orbit determination.
Eunhyouek Kim +2 more
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Shadowing Lemma and Chaotic Orbit Determination [PDF]
, 2015 Orbit determination is possible for a chaotic orbit of a dynamical system, given a finite set of observations, provided the initial conditions are at the central time. In a simple discrete model, the standard map, we tackle the problem of chaotic orbit determination when observations extend beyond the predictability horizon. If the orbit is hyperbolic,
arxiv +1 more source
Precise Orbit Determination of FY-3C with Calibration of Orbit Biases in BeiDou GEO Satellites
Remote Sensing, 2018 The emerging BeiDou navigation satellite system has contributed to global precise positioning and has recently moved toward space-borne applications.
Qiang Zhang +3 more
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Applied Sciences, 2023 The Changchun Observatory of the National Astronomical Observatories, Chinese Academy of Sciences, and the Shanghai Astronomical Observatory are used to generate very short arc (VSA) angle observations of objects in low Earth orbit (LEO) and ...
Xiangxu Lei +8 more
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Comparing Analytical and Numerical Approaches to Meteoroid Orbit Determination using Hayabusa Telemetry [PDF]
, 2018 Fireball networks establish the trajectories of meteoritic material passing through Earth's atmosphere, from which they can derive pre-entry orbits. Triangulated atmospheric trajectory data requires different orbit determination methods to those applied to observational data beyond the Earth's sphere-of-influence, such as telescopic observations of ...
arxiv +1 more source
A sub-determinant approach for pseudo-orbit expansions of spectral determinants in quantum maps and quantum graphs [PDF]
Phys. Rev. E 87, 052919 (2013), 2012 We study implications of unitarity for pseudo-orbit expansions of the spectral determinants of quantum maps and quantum graphs. In particular, we advocate to group pseudo-orbits into sub-determinants. We show explicitly that the cancellation of long orbits is elegantly described on this level and that unitarity can be built in using a simple sub ...
arxiv +1 more source
Remote SensingSpace-based opportunistic positioning is a crucial component of resilient positioning, navigation, and timing (PNT) systems, and it requires the acquisition of orbit information for non-cooperative low Earth orbit (LEO) satellites.
Ruofan Deng, Honglei Qin, Yu Zhang
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Initial Conditions of Closed Classical Orbits from Quantum Spectra [PDF]
Chaos 6, 63 (1996), 2008 A method is presented for determining the initial conditions of classical orbits from the quantum spectra of the diamagnetic hydrogen atom. Each classical trajectory which is closed at the nucleus produces a sinusoidal fluctuation in the photoabsorption spectrum.
arxiv +1 more source
Orbit Determination for All-Electric GEO Satellites Based on Space-Borne GNSS Measurements
Remote Sensing, 2022 Orbit accuracy of the transfer orbit and the mission orbit is the basis for the orbit control of all-electric-propulsion Geostationary Orbit (GEO) satellites.
Wenqiang Lu +3 more
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