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Author: Publisher: ISBN: Category : Languages : en Pages : 46
Book Description
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 from the satellite are used to derive a current model atmosphere different from any standard atmospheres and permitting, in subsequent decay computations, a good long-term prediction capability. Computation of final orbit decay with both the Satellite Lifetime Program and the RAND ROCKET Program is then illustrated for the case of Cosmos 5; in this case adjustment of the satellite's ballistic coefficient is used to adjust effectively a model atmosphere to simulate the current atmosphere. (Author).
Author: Publisher: ISBN: Category : Languages : en Pages : 46
Book Description
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 from the satellite are used to derive a current model atmosphere different from any standard atmospheres and permitting, in subsequent decay computations, a good long-term prediction capability. Computation of final orbit decay with both the Satellite Lifetime Program and the RAND ROCKET Program is then illustrated for the case of Cosmos 5; in this case adjustment of the satellite's ballistic coefficient is used to adjust effectively a model atmosphere to simulate the current atmosphere. (Author).
Author: Brian D. Neuenfeldt Publisher: ISBN: Category : Languages : en Pages : 250
Book Description
The primary goal of this thesis is to identify the 'state-of-the-art' in orbit-decay-induced uncontrolled reentry/impact prediction methods, with an emphasis on the physics of the final few revolutions to impact. This was accomplished through a comprehensive literature survey from the 1950's to the present of unclassified military and civil databases. The results of the survey show that the current U.S. and international reentry/impact prediction methodologies are based on analysis which is over 30 years old. Of the various 'extensions' to the current reentry theory, of which the NORAD method is recognized as the international standard, there does not appear to be any one method which is singularly superior to the others. It has also been shown that numerous reentry investigations made simplifying assumptions due to insufficient data needed to accurately model reentry and also because of computing limitations of their day. Also, current deterministic dynamic models appear to inadequately describe the actual uncontrolled reentry process, due to a lack of observational data, uncertainty in determining aerodynamic coefficients, atmospheric density, and point mass modeling where changes in vehicle configuration, attitude and lift are neglected. Stochastic and statistical methods could be applied to the current methodology, to better analyze the various uncertainties, which could help to improve the overall predicted impact time and location; however, further research into these methods along with the physics of uncontrolled reentry is necessary. Reentry, Uncontrolled reentry, Reentry effects, Reentry prediction, Impact prediction, Reentry motion, Reentry aerothermodynamics, Satellite breakup, Atmospheric density models, Reentry/ impact models.
Author: Oliver Montenbruck Publisher: Springer Science & Business Media ISBN: 9783540672807 Category : Nature Languages : en Pages : 400
Book Description
This modern presentation guides readers through the theory and practice of satellite orbit prediction and determination. Starting from the basic principles of orbital mechanics, it covers elaborate force models as well as precise methods of satellite tracking. The accompanying CD-ROM includes source code in C++ and relevant data files for applications. The result is a powerful and unique spaceflight dynamics library, which allows users to easily create software extensions. An extensive collection of frequently updated Internet resources is provided through WWW hyperlinks.
Author: National Research Council Publisher: National Academies Press ISBN: 0309051258 Category : Science Languages : en Pages : 225
Book Description
Since the beginning of space flight, the collision hazard in Earth orbit has increased as the number of artificial objects orbiting the Earth has grown. Spacecraft performing communications, navigation, scientific, and other missions now share Earth orbit with spent rocket bodies, nonfunctional spacecraft, fragments from spacecraft breakups, and other debris created as a byproduct of space operations. Orbital Debris examines the methods we can use to characterize orbital debris, estimates the magnitude of the debris population, and assesses the hazard that this population poses to spacecraft. Potential methods to protect spacecraft are explored. The report also takes a close look at the projected future growth in the debris population and evaluates approaches to reducing that growth. Orbital Debris offers clear recommendations for targeted research on the debris population, for methods to improve the protection of spacecraft, on methods to reduce the creation of debris in the future, and much more.
Author: 
Author: 
Author: Carl Gazley
Author: Martin C. Eckstein
Author: Canada. Department of Communications
Author: Jon David Strizzi
Author: J. De Lafontaine
Author: Rand Corporation
Author: Brian D. Neuenfeldt
Author: Oliver Montenbruck
Author: National Research Council