نتایج جستجو برای: initial orbit determination
تعداد نتایج: 649417 فیلتر نتایج به سال:
Abstract Since the first pair of BeiDou satellites was deployed in 2000, China has made continuous efforts to establish its own independent Navigation Satellite System (BDS) provide regional radio determination satellite service as well and global navigation services, which rely on high quality orbit clock products. This article summarizes achievements precise (POD) BDS past decade with focus o...
Sentinel-1A is the first satellite of the European Copernicus programme. Equipped with a Synthetic Aperture Radar (SAR) instrument the satellite was launched on April 3, 2014. Operational since October 2014 the satellite delivers valuable data for more than two years. The orbit accuracy requirements are given as 5 cm in 3D. In order to fulfill this stringent requirement the precise orbit determ...
The computational complexity of track initiation, also known as initial orbit determination or IOD, using only angle measurements is polynomial in the number of observations. However, the polynomial degree can be high, always at least cubic and commonly quartic or higher. Therefore, practical implementations require attention to the scalability of the algorithms, when one is dealing with the ve...
We study generalized indicators of sensitivity to initial conditions and orbit complexity in topological dynamical systems. The orbit complexity is a measure of the asymptotic behavior of the information that is necessary to describe the orbit of a given point. The indicator generalizes, in a certain sense, the Brudno’s orbit complexity (which is strongly related to the entropy of the system). ...
Flight dynamics is a topic often overlooked by operators of small satellites without propulsion systems, as two-line elements (TLE) are easily accessible and accurate enough for most ground segment needs. However, the advent cheap miniaturized global navigation satellite system (GNSS) receivers laser retroreflectors well modern, easy-to-use, open-source software tools have made it easier to acc...
In this paper, a generalized Adams-Moulton method that is a m-step method derived by using the Taylor’s series is proposed to solve the satellite orbit determination problem. We show that our proposed method has produced much smaller error than the original Adams-Moulton method. Finally, the accuracy performance is demonstrated in the satellite orbit correction problem by giving a numerical exa...
Orbits for satellites o f the Global Positioning System (GPS) have been determined with submeter accuracy. Tests used to assess orbit accuracy include orbit comparisons from independent data sets, orbit prediction, ground baseline determination, and formal errors. One satellite tracked for 8 hours each day shows rms errors below I m even when predicted more than 3 days outside of a 1-week data ...
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