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28 October 2006 ENVISAT ASAR orbit error analysis and case study
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Proceedings Volume 6419, Geoinformatics 2006: Remotely Sensed Data and Information; 641928 (2006)
Event: Geoinformatics 2006: GNSS and Integrated Geospatial Applications, 2006, Wuhan, China
Satellite's position is the major role for determining the baseline errors in interferograms. With high precision satellite position, the flat earth component can be removed. Envisat satellite bases on DORIS system for controlling and calculating its orbit within several centimeters precision. However, even several millimeters baseline error may cause fringes in the interferogram. This paper studied the baseline error profiles in interferograms and analyzed the Envisat satellite orbit characters. The linear part and the nonlinear part of the baseline errors in the interferograms have been studied. Fourier transformation for the two parts has been tested. With ASAR data sets, a case study has been made. The results showed that the orbits in ASAR products were not precise enough for interferometry and precise orbits from Delft and GFZ were more reliable. The linear part of the baseline error is easy to be discerned and mimicked but the nonlinear part is hard to derive and eliminate. The satellite orbit characters should be studied more to reveal the nonlinear part baseline errors.
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Tao Li, Jingnan Liu, Mingsheng Liao, and Ye Xia "ENVISAT ASAR orbit error analysis and case study", Proc. SPIE 6419, Geoinformatics 2006: Remotely Sensed Data and Information, 641928 (28 October 2006);

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