Accession Number:

AD0730855

Title:

Some Higher Order Analyses of Earth and Lunar Orbiters,

Descriptive Note:

Corporate Author:

STANFORD UNIV CALIF DEPT OF AERONAUTICS AND ASTRONAUTICS

Personal Author(s):

Report Date:

1971-05-01

Pagination or Media Count:

132.0

Abstract:

The report is concerned with the accurate modelling of the translational behavior of a drag-free satellite in an almost circular near-earth orbit. Specifically, all of the short period and long period position fluctuations in the satellites coordinates down to one meter in amplitude are determined. Considered in the equations of motion are the general zonal and tesseral harmonic effects as well as the lunar and solar effects. The results of the study will allow the efficient evaluation of information about the gravity field from special low altitude small eccentricity orbits selected for drag-free operation. A non-canonical approach is followed. A mean orbital plane is chosen in such a way that no short period out-of-plane fluctuations greater than second order occur. This frame of reference undergoes long period changes in inclination and nodal position. The short period radial and cross-track fluctuations are computed as a function of position along the orbit. The in-track fluctuations are determined by the solution of the time equation. These fluctuations are derived from Lagranges Planetary Equations. Author

Subject Categories:

  • Unmanned Spacecraft
  • Spacecraft Trajectories and Reentry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE