Statistics – Methodology
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994angeo..12..775e&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 12, no. 8, p. 775-784
Statistics
Methodology
Aerodynamic Drag, Earth Orbits, Ers-1 (Esa Satellite), Orbit Calculation, Orbit Perturbation, Orbital Mechanics, Radiation Pressure, Acceleration, Doppler Radar, Geomagnetism, Orbital Elements, Solar Radiation, Spot (French Satellite), Tracking (Position)
Scientific paper
In long-arc precise orbit determinations of altimetric satellites such as ERS-1, large errors may occur from mismodeling of aerodynamic drag and solar radiation pressure. Such surface forces for nonspherical satellites require accurate modeling of the effective area and particle-surface interactions, but the dominant source of error is neutral air density as derived from thermospheric models for aerodynamic drag. Several techniques can be employed to alleviate air-drag mismodeling but all require the solution of additional parameter from the racking data. However, for ERS-1 the sparsity of laser range data limits the application of such empirical techniques. To overcome this, use can be made of the dense Doppler Orbitography and Radiopositioning Integrated by Satellite (DORIS) Doppler tracking for SPOT2 which is in a similar orbit to ERS-1. A recent investigation by CNES examined the use of drag scale factors from SPOT2 to constrain the ERS-1 orbit. An improvement to that methodology is to consider along-track mismodeling as observed by timing errors in the Doppler data for each pass of SPOT2. The along-track correction to the acceleration as derived from SPOT2 can then be applied to ERS-1 orbits, solving for a scale factor to absorb systematic errors - particularly that arising from the 50 km altitude difference. Results ae presented of the associated improvement in ERS-1 orbits as derived from concurrent SPOT2 arcs. It will be seen that the procedure not only improves the laser range fit, but more importantly, leads to more precise radial positioning as evident in the altimeter and crossover residuals.
Ehlers S.
Moore Patrick
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