Earth's Rotation in 1975-1979 Based on Doppler Satellite Observations.

Abstract

Doppler observations of Navy Navigation Satellites have been used to determine changes in earth's rotation during the years 1975-1979. Annual and semiannual variations determined from the Doppler observations are not valid due to the neglect of the gravitational effects of atmospheric and ocean tides on the orbit of a satellite. However, variations with periods of 50 to 120 days are correlated well with astronomic results. These variations integrate to amplitudes of two or more milliseconds in UT-1. Shorter period variations only occasionally correlate with astronomic results. There are also occasional conflicts in phases; and, generally, there is only about a 50-percent agreement in amplitude of the shorter period variations obtained from observations of different satellites. (Author)

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1980
Accession Number
ADA088095

Entities

People

  • Richard J. Anderle

Organizations

  • Naval Surface Warfare Center Dahlgren Division

Tags

DTIC Thesaurus Topics

  • Artificial Satellites
  • Astronautics
  • Classification
  • Coefficients
  • Computations
  • Frequency
  • Geodetic Satellites
  • Geological Phenomena
  • Inertial Navigation Systems
  • Navigation
  • Navigation Satellites
  • Observation
  • Ocean Tides
  • Orbits
  • Rotation
  • Satellite Orbits
  • Spacecraft

Fields of Study

  • Environmental science

Readers

  • Astronomy and Astrophysics.
  • Space Exploration and Orbital Mechanics.
  • Space/Atmospheric Physics.

Technology Areas

  • Space
  • Space - Orbital Debris