Results 271 to 280 of about 481,935 (310)

Unstable periodic orbits and prediction

Physical Review A, 1991
A hierarchical approximation of a generic chaotic attractor can be formulated in terms of unstable periodic orbits. We demonstrate the possibility of extracting the most dominant unstable periodic orbits from a measurement of a time-continuous flow. Since unstable periodic orbits not only represent the static properties of the system but also dominate ...
Klaus Pawelzik, H. G. Schuster
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On the prediction of satellite orbit decay and impact [PDF]

Conference on Aerospace Meteorology, 1966
Abstract : Presentation of problems associated with predicting satellite orbit decay plus a description of several computer programs for computing long-term orbit decay, model atmospheres, and final decay and re-entry. Computation of long-term orbit decay using the RAND Satellite Lifetime Program is illustrated for Explorer 9, and the orbit-decay data ...
G. F. Schilling, Carl Gazley, Louis N. Rowell   +2 more
openaire   +1 more source

Orbit Prediction Technology

2018
The OTV fulfills orbital maneuver by selecting appropriate transfer points to save fuels. Usually, before the orbital maneuver, it shall carry out non-powered free sliding in large elliptic orbit for a long time. During such process, due to the longer sliding period, the error of inertial navigation will be accumulated as time elapses.
Xuefeng Li, Chaobing Li
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A discussion on orbital analysis - Some problems of orbital prediction

Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1967
Attention is paid to the problem of predicting accurately (a) the orbital elements of a balloon satellite over long periods of time, and (b) the time the satellite will pass through a given point in the orbit, a few days or weeks in advance of the event.
D. E. Smith, A. Abayaratna
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An analytical method for satellite orbit prediction

Chinese Astronomy and Astrophysics, 2006
Abstract Orbit prediction of artificial satellites is a key link in space surveillance and real-time tracking. Because of the large number of objects to be tracked and because the required precision is not too high, the analytical method is often used in this connection. Such a method is given in this paper.
Liu Lin, Wang Yan-rong
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Predicting the orbital lifetimes of Earth satellites

Acta Astronautica, 1988
Abstract Accurate prediction of the lifetimes of satellites decaying naturally under the action of air drag is one of the most difficult problems of orbital dynamics. Lifetime estimation is also a matter of practical importance when a satellite perceived as ‘dangerous’ is about to decay.
Doreen M.C. Walker, Desmond King-Hele
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NASA GSFC Lunar Reconnaissance Orbiter (LRO) Orbit Estimation and Prediction [PDF]

SpaceOps 2010 Conference, 2010
This paper details the upgrades performed and also provides an overview of the performance of these upgrades during the actual support of the mission. Also presented are details of the integration of the software tools and automation implemented, including an overview of the integration of government legacy orbit estimation tools and automation with ...
Ann Nicholson, Steven Slojkowski, Anne Long, Mark Beckman, Rivers Lamb   +4 more
openaire   +1 more source

The prediction of satellite orbits

1963
In this paper we develop a perturbation method and apply it to the prediction of orbits of earth satellites that are disturbed by various external forces. The theory of resonances and stable orbit configurations, possible when sunlight pressure is important, are also analyzed.
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Preoperative imaging to predict orbital invasion by tumor

Head & Neck, 2000
Our purpose was to examine the accuracy of preoperative imaging in assessing tumor invasion of the orbit and nasolacrimal system.Nineteen preoperative CT and 17 preoperative MR images from patients at risk for orbital invasion were retrospectively reviewed.
Andrew N. Goldberg, David M. Yousem, Marc D. Eisen, Laurie A. Loevner, Warren B. Bilker, Erica R. Thaler   +5 more
openaire   +3 more sources

Orbit Determination and Prediction, and Computer Programs

Bell System Technical Journal, 1963
Orbit determination and prediction programs are needed to generate ephemerides for the satellite. Orbit determination is from tracking data consisting of angles only, and is based on a modified version of a method by R. E. Briggs and J. W. Slowey of the Smithsonian Institution.
E. G. Halline, W. C. Ridgway, R. B. Blackman, A. J. Claus   +3 more
openaire   +2 more sources