The effect of circular satellite orbits assumption on inverting earth's stmospheric parameters byGPS radio occultation

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Gps, Radio Occultation, Earth'S Atmospheric Parameters

Scientific paper

The analytic expressions for refracting angle in GPS radio occultation is presented Taking the refracting angle under circular orbit assumptions as a priori value iterative processing is employed to derive refracting angle series devoid of circular orbit assumptions. Further, differenced atmospheric parameters are calculated based on an inverse method, taking into account the two different cases cases (inclusive of and exclusive of circular orbit assumptions).It has demonstrated that effect of circular orbit assumptions will bring about up to one milli-bar bias in pressure and up to one Kelvin bias in temperature. On one hand, this result supports those researchers who are engaged in qualitative error sourced analyses and are liable to employ circular orbit assumptions; on the other hand, it warns it necessary to keep in mind forsaking the circular orbit assumptions when demanding accuracy is the atmospheric parameters.

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