Abstract
This study investigates the behaviour of satellite altimeter data in coastal regions in order to estimate a boundary around Australia’s coasts in which the altimeter range may be poorly estimated by on-board tracking software. These contaminated data are then retracked to give a preliminary improved result. Over one million ERS-2 (March to April 1999) and Poseidon (January 1998 to January 1999) radar altimeter waveform data were used in an area of 350 km off Australia’s shoreline. Using the 50% retracking point as the estimate of the expected tracker point, the ERS-2 and Poseidon missions do not exactly track at the ‘tracker point/gate’ in areas within 10 km off the shoreline. Using the standard deviation of the mean power of the returned waveforms as an indication of the general variability shows obvious coastal contamination out to ~4 km, and less obvious contamination out to ~8-10 km. The preliminary results from an iterative least squares retracking procedure show that retracking can extend the altimeter-derived sea surface height profile shoreward along ground tracks. Therefore, retracking appears necessary to correct the on-board estimates of the range measurements in coastal regions.
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© 2002 Springer-Verlag Berlin Heidelberg
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Deng, X., Featherstone, W.E., Hwang, C., Berry, P.A.M. (2002). Analysis of Poseidon and ERS-2 Satellite Radar Altimeter Waveform Data around Australian Coasts. In: Ádám, J., Schwarz, KP. (eds) Vistas for Geodesy in the New Millennium. International Association of Geodesy Symposia, vol 125. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-04709-5_92
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DOI: https://doi.org/10.1007/978-3-662-04709-5_92
Publisher Name: Springer, Berlin, Heidelberg
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