Improved threshold retracker for satellite altimeter waveform retracking over coastal sea*
Source abstract
Abstract
Abstract Data quality is a key factor for the application of satellite to geodesy and oceanography. Accuracy of altimetry is limited in the coastal area because the altimeter waveforms are seriously contaminated by topography and environmental pollution. So waveform retracking is needed to compute the range correction of geophysical data records (GDRs) for better accuracy. In this paper, a new waveform retracker named the improved threshold retracker (ITR) is put forward. The retracker first builds sub-waveforms based on leading edges detected in a waveform, then determines the middle point of each leading edge to compute the retracking range correction, finally calculates the referenced sea surface heights according to the geoid undulation from a local geopotential model and tide heights from an ocean tide mode, and compares it with all retracking ranges to determine the best one. As a test, altimeter waveforms of Geosat GM are retracked around the Taiwan coastal area. The result shows that accuracy of I...
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Geophysics and Gravity Measurements · Ocean Waves and Remote Sensing · Oceanographic and Atmospheric Processes
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (15)
Show source-provided references
1. Bosch, W.(2004) Geodetic application of satellite altimetry. In Satellite Altimetry for Geodesy, Geophysics and Oceanography. ( pp. 3 - 21 ). Berlin : Springer-Verlag. IAG Symposia10.1007/978-3-642-18861-9_1 ↗
2. Fu, L. and Cazenave, A.(2001) Satellite altimetry and Earth Sciences. In . San Diego California: Academic Press.
3. Deng, X.(2004) Improvement of geodetic parameter estimation in costal regions from satellite radar altimetry. In . Department of Spatial Sciences, Curtin University of Technology. Thesis for Ph. D
4. Brown, G. (1977) The average impulse response of a rugh surface and its application IEEE Transaction on Antenna and Propagation, AP-25(1), pp. 67 - 74.
5. Martin, T. and Zwally, H. and Brenner, A. and (1983) Analysis and tracking of continental ice sheet radar altimeter waveforms Journal of Geophysical Research, 88(C3), pp. 1608 - 1616.
6. Wingham, D. and Rapley, C. and Griffiths, H.(). New techniques in satellite altimeter tracking systems. Proceedings of IGARSS, 86 Symposium ZurichSept1986. In [ pp. 1339 - 1344] . .
7. Bamber, J. (1994) Ice sheet altimeter processing scheme International Journal of Remote Sensing, 20, pp. 48 - 54.
8. Davis, C. (1993) A surface and volume scattering retracking algorithm for ice sheet satellite altimetry IEEE Transaction on geoscience and Remote Sensing, 31(4), pp. 811 - 818.
9. Moritz, H.(1980) Advanced Physical Geodesy. In . New York : Abacus Press.
10. Bettadpur, S. and Eanes, R. (1994) Geographical representation of radial orbit perturbations due to ocean tides: implication for satellite altimetry Journal of Geophysical Research, 99, pp. 24883 - 24894.
11. Lillibridge, J. and Smith, W. and Scharroo, R. and et, al.(). The Geosat geodetic mission twentieth anniversary edition data product. AGU 2004 Fall Meeting San Francisco2004. In [ pp. ] . .
12. GRACE home page. http://www.csr.utexas.edu/grace/[2005.6.8]
13. Lemoine, F. and Kenyon, S. and Factor, J. and (1998) The development of joint NASA GSFC and the National Imagery and Mapping Agency (NIMA) geopotential model EGM96. In . Greenbelt MD: National aeronautics and space Administration. Report NASA/TP 1998–206861
14. Eanes, R. and Shuler, A.(1999) Applications of an improved global tide model. In . Greenbelt MD: NASA. Report T/P & Jason-1 SWT
15. Hwang, C. and Guo, J. and Liu, Y. and (2005) Gravity anomalies in coastal waters from retracked Geosat/GM altimetry: comparison with shipborne and airborne gravity data. In Dynamic Planet 2005. . Australia