NDLI: Techniques of orbital decay and long-term ephemeris prediction for satellites in earth orbit

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Techniques of orbital decay and long-term ephemeris prediction for satellites in earth orbit

Content Provider	NASA Technical Reports Server (NTRS)
Author	Pimm, R. S. Barry, B. F. Rowe, C. K.
Copyright Year	1971
Description	In the special perturbation method, Cowell and variation-of-parameters formulations of the motion equations are implemented and numerically integrated. Variations in the orbital elements due to drag are computed using the 1970 Jacchia atmospheric density model, which includes the effects of semiannual variations, diurnal bulge, solar activity, and geomagnetic activity. In the general perturbation method, two-variable asymptotic series and automated manipulation capabilities are used to obtain analytical solutions to the variation-of-parameters equations. Solutions are obtained considering the effect of oblateness only and the combined effects of oblateness and drag. These solutions are then numerically evaluated by means of a FORTRAN program in which an updating scheme is used to maintain accurate epoch values of the elements. The atmospheric density function is approximated by a Fourier series in true anomaly, and the 1970 Jacchia model is used to periodically update the Fourier coefficients. The accuracy of both methods is demonstrated by comparing computed orbital elements to actual elements over time spans of up to 8 days for the special perturbation method and up to 356 days for the general perturbation method.
File Size	8787381
Page Count	204
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19720004932
Archival Resource Key	ark:/13960/t99649c28
Language	English
Publisher Date	1971-11-01
Access Restriction	Open
Subject Keyword	Navigation Perturbation Theory Artificial Satellites Satellite Orbits Friction Drag Decay Orbit Calculation Geodesy Ephemerides Equations of Motion Orbital Elements Elliptical Orbits Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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