Bias in pole positions computed from Navy navigation satellites
Abstract
The accuracy of the computed orbit of a satellite with respect to an earth observer depends on the accuracy of knowledge of the motion of the earth's spin axis with respect to the crust (polar motion). Solutions for the orientation of the spin axis from Doppler observations of Navy navigation satellites 196792A and 197067A differed by 1 to 2 meters. Despite the fact that the orbital inclinations and heights of these satellites are similar, studies have shown that this bias in pole position can be due to imprecision in knowledge of the nonresonant terms in the gravity model used in the determination of the orbits.
 Publication:

AIAA, Astrodynamics Specialist Conference
 Pub Date:
 August 1981
 Bibcode:
 1981aiaa.confX....C
 Keywords:

 Earth Axis;
 Navigation Satellites;
 Orbit Calculation;
 Position Errors;
 Satellite Observation;
 Bias;
 Doppler Effect;
 Earth Rotation;
 Eccentricity;
 Error Analysis;
 Gravitational Fields;
 Navy;
 Satellite Orbits;
 Spin Dynamics;
 Astrodynamics