Ιδρυματικό Αποθετήριο
Πολυτεχνείο Κρήτης
Πολυτεχνείο Κρήτης
EN
|
EL
| URI: | http://purl.tuc.gr/dl/dias/8F321666-69FD-4ABB-9A26-10816B41682F | ||
| Έτος | 2012 | ||
| Τύπος | Δημοσίευση σε Περιοδικό με Κριτές | ||
| Άδεια Χρήσης |
|
||
| Βιβλιογραφική Αναφορά | Hausleitner W., F. Moser, J.‐D. Desjonqueres, F. Boy, N. Picot, J. Weingrill, S. Mertikas, A. Daskalakis. "A new method of precise Jason‐2 altimeter calibration using a microwave transponder", Marine Geodesy, Vol. 35, No 1, pp:337-362 doi:10.1080/01490419.2012.718239 https://doi.org/10.1080/01490419.2012.718239 | ||
| Εμφανίζεται στις Συλλογές |
This study presents a new method of precise altimeter absolute calibration using a dedicated microwave transponder, which acts as an altimeter signal repeater that can be deployed at any sub-track position both in coastal regions and inland. The Austrian Academy of Sciences operates an altimeter transponder at the Gavdos calibration/validation facility located beneath a Jason cross-over point.We discuss the capabilities and strengths of the transponder technique in general and in the particular case of a dedicated calibration campaign carried out in 2011. For the accomplishment of this campaign, including 26 ascending and descending Jason-2 passes, the onboard Poseidon-3 altimeter had to be switched to the DIODE/DEM mode for every overflight. Four different methods have been developed to analyze the transponder generated waveforms, provided by S-IGDR and S-GDR products, respectively.The resulting biases of the altimetric ranges have proven to be stable (3 mm rms) and agree to a large extent among the proposed algorithms. However, the absolute bias value of 25.8 ± 0.3 cm derived from the transponder calibration technique shows a significant deviation of several centimeters compared with the ones resulting from conventional techniques. Possible causes of this behavior are under further investigation.
Copyright © DIAS 2013
