Geometry and accuracy of reflecting points in bistatic satellite altimetry |
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Authors: | J Kostelecký J Kloko?ník CA Wagner |
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Institution: | (1) Center for Earth Dynamics Research (CEDR), Prague-Ondřejov, Czech Republic;(2) Astronom. Inst. Czech Acad. Sci., 251 65, Ondřejov Observatory, Czech Republic;(3) Faculty of Civil Engineering, TU Prague, Czech Republic;(4) Research Institute of Geodesy, Topography and Cartography, 250 66, Zdiby 98, Czech Republic;(5) NOAA/NESDIS, Laboratory for Satellite Altimetry, Silver Spring, MD 20910-3226, USA |
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Abstract: | The analysis of the time and space distribution of specular (reflecting) points in bistatic altimetry between GPS and CHAMP
satellites or SAC-C (taken as examples) is extended from Wagner and Klokočník (2003 J. Geod 77: 128–138). We demonstrate a
significantly higher number and density of reflecting points in bistatic altimetry in comparison with traditional monostatic
altimetry. After an outline of our older accuracy assessment for the vertical position of the reflecting point, we add a new
independent derivation and compare both approaches. We account for orbit errors of both the transmitters (GPS) and receiver
(CHAMP) satellites, and the measurement (delay) error. We found that the accuracy of the vertical position of the reflecting
point decreases only slowly with increasing off-nadir angle and that the orbit errors must be accounted for if decimeter and
better accuracy is required. In this paper, we do not study errors such as state of the ocean, technical parameters of the
receiving system, and atmospheric corrections. |
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Keywords: | Satellite bistatic (GPS GNSS-R) altimetry GPS CHAMP SAC-C Satellite dynamics Orbit accuracy |
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