Precise orbit determination with a short-arc technique

Details Precise orbit determination with a short-arc technique Precise orbit determination with a short-arc technique

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993cemda..57..405b&link_type=abstract

Celestial Mechanics and Dynamical Astronomy (ISSN 0923-2958), vol. 57, no. 1-2, p. 405

Astronomy and Astrophysics

Astronomy

Calibrating, Satellite Altimetry, Satellite Orbits, Satellite Tracking, Altimeters, Ers-1 (Esa Satellite), Laser Range Finders, Poseidon Satellite, Satellite Doppler Positioning, Satellite-Borne Instruments, Spot (French Satellite), Topex

Scientific paper

Satellites carrying altimeters can measure the height of the satellite above the ocean surface with an accuracy of about 2 cm to 10 cm. In order to use fully these data, for studies of ocean topography, it is necessary to determine the height of the satellite above a reference surface with a similar accuracy; it is also necessary to calibrate the altimetric measurements. These points require a precise orbit determination in order to obtain an absolute satellite position with an accuracy of a few centimeters, at least locally, and essentially for the radial component. Considering the value of the expected accuracy of the radar altimeters, the use of a short-arc technique based on a geometric approach should permit us to take into account local errors in limited geographical regions which can not be considered in a global orbit computation by a dynamical approach. Our method consists in fitting the geometrical positions of the satellite over a short period of time with the tracking measurements from a ground station network and considering a simplified orbital error model. We correct the reference orbit by applying along-track, across-track and radial displacements, that are represented as simple constants, or with a linear or quadratic variation in time. The ability of the short-arc technique to reach the required accuracy on the radial orbit component is shown.

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