5. A Simulation Study for Sub-Meter Geodesy in the Pacific Basin

  1. George H. Sutton,
  2. Murli H. Manghnani,
  3. Ralph Moberly and
  4. Ethel U. Mcafee
  1. P. Morgan

Published Online: 17 MAR 2013

DOI: 10.1029/GM019p0059

The Geophysics of the Pacific Ocean Basin and Its Margin

The Geophysics of the Pacific Ocean Basin and Its Margin

How to Cite

Morgan, P. (1976) A Simulation Study for Sub-Meter Geodesy in the Pacific Basin, in The Geophysics of the Pacific Ocean Basin and Its Margin (eds G. H. Sutton, M. H. Manghnani, R. Moberly and E. U. Mcafee), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM019p0059

Author Information

  1. Division Of National Mapping, P.O. Box 667. Canherra City, A.C.T., 2601, Australia

Publication History

  1. Published Online: 17 MAR 2013
  2. Published Print: 1 JAN 1976

ISBN Information

Print ISBN: 9780875900193

Online ISBN: 9781118663592



  • Geophysics—Pacific area—Congresses;
  • Woollard, George Prior, 1908


The advent of Lunar Laser Ranging (LLR). with precisions greater than 10 cm, offers geodesists and geophysicists an unprecedented tool for measuring the dynamic earth and exploring its mysteries. LLR is a fixed-site astronomical technique not readily adaptable to rapid observations in some of the earth's harsher environments nor to the special logistics of those regions. Orbiting artificial satellites, as well as being weather independent, offer techniques that make use of portable equipment. Unfortunately this gain in versatility is at the expense of precision and accuracy. The combination of three Pacific basin LLR observatories collocated with Doppler tracking stations offers the possibility of recovering geodetic information at the sub-meter level. The actual level of the precision of recovery is dependent on the configuration adopted. The Timation III satellite, the only current high precision geodetic satellite capable of spanning the Pacific basin, is particularly suited for this work as offsets and biases of all oscillators taking part in the observing program can now be calibrated. thus considerably tightening up the a priori conditions of the solution. Simulation studies combining Doppler tracking of the Timation satellite in a multi-pass multi-station short arc mode with time transfer information and high precision LLR control show that sub-meter positions can be determined in a unique center of mass reference system over the entire Pacific basin. At the present time the level of precision is 0.3 m per component. This precision should be improved once the satellite is also tracked by laser ranging devices, and transportable LLR becomes operational.