Abstract's details
Wave vertical orbital velocity effects on Doppler Altimeter waveform and SSH measurement
CoAuthors
Event: 2016 SAR Altimetry Workshop
Session: Applications, SAR for science
Presentation type: Type Poster
Contribution: not provided
Abstract:
The resolution of Doppler altimeters is based on the Doppler shift caused by the movement of the antenna relative to the earth. Such an effect depends on the vertical component of the satellite velocity, which is very small near the zenith, i.e. a few metres per second at the border of the first Doppler beam for the Cryosat DDA.
(FIG 1)
Vertical components of the sea waves orbital velocity can easily reach such values and in principle they might interfere with the along-track positioning of the return beam. This interference (“Reale effect”) normally does not constitute a problem when the wavelength of sea waves is much smaller than resolution of the altimeter; however, swell over the ocean may reach wavelengths of the same order as the Doppler beam length (a few hundred meters).
The paper will present the results of simulations aimed at assessing the effect of R-effect on the waveform formation as well as on the SSH values, with special regard to long wave sea states (swell),
Basic references:
Fenoglio Marc, L, Dinardo, S., Scharroo, R., Roland, A., Dutour, M., Lucas, B., Becker, M., Benveniste, J., Weiss, R. (2015). The German Bight: a validation of CryoSat altimeter data in SAR mode,
Gommenginger C, Cipollini P., Snaith H., West L.& Passaro M. SAR altimetry over the open and coastal ocean: Status and Open issues
Gommenginger Christine, Cristina Martin‐Puig, Laiba Amarouche & R. Keith Raney, Review Of State Of Knowledge For SAR Altimetry Over Ocean EUMETSAT REFERENCE: EUM/RSP/REP/14/749304 2013
Halimi A.,C. Mailhes, J.-Y. Tourneret, P. Thibaut, and F. Boy, A semi-analytical model for delay/Doppler altimetry and its estimation algorithm, IEEE Trans. Geosci. and Remote Sensing, 52 (7), 4248 - 4258, July 2014. DOI: 10.1109/TGRS.2013.2280595
Martin-Puig, G. Ruffini, J. Marquez, D. Cotton, M. Srokosz, P. Challenor, R. K. Raney, and J. Benveniste,
“Theoretical model of SAR altimeter over water surfaces,” Proc. IEEE Int. Conf. Geosci. Remote Sens. (IGARSS) Boston, U.S.A., July 7-11, 200
Raney R. K. The Delay-Doppler Altimeter 200 Briefing for the Coastal Altimetry Workshop
Reale F., F. Dentale, E. Pugliese Carratelli On the effect of wave vertical orbital velocity on Doppler Radar Altimetry, 2016 EUMETSAT Conference 2016, Darmstadt, Germany,
(FIG 1)
Vertical components of the sea waves orbital velocity can easily reach such values and in principle they might interfere with the along-track positioning of the return beam. This interference (“Reale effect”) normally does not constitute a problem when the wavelength of sea waves is much smaller than resolution of the altimeter; however, swell over the ocean may reach wavelengths of the same order as the Doppler beam length (a few hundred meters).
The paper will present the results of simulations aimed at assessing the effect of R-effect on the waveform formation as well as on the SSH values, with special regard to long wave sea states (swell),
Basic references:
Fenoglio Marc, L, Dinardo, S., Scharroo, R., Roland, A., Dutour, M., Lucas, B., Becker, M., Benveniste, J., Weiss, R. (2015). The German Bight: a validation of CryoSat altimeter data in SAR mode,
Gommenginger C, Cipollini P., Snaith H., West L.& Passaro M. SAR altimetry over the open and coastal ocean: Status and Open issues
Gommenginger Christine, Cristina Martin‐Puig, Laiba Amarouche & R. Keith Raney, Review Of State Of Knowledge For SAR Altimetry Over Ocean EUMETSAT REFERENCE: EUM/RSP/REP/14/749304 2013
Halimi A.,C. Mailhes, J.-Y. Tourneret, P. Thibaut, and F. Boy, A semi-analytical model for delay/Doppler altimetry and its estimation algorithm, IEEE Trans. Geosci. and Remote Sensing, 52 (7), 4248 - 4258, July 2014. DOI: 10.1109/TGRS.2013.2280595
Martin-Puig, G. Ruffini, J. Marquez, D. Cotton, M. Srokosz, P. Challenor, R. K. Raney, and J. Benveniste,
“Theoretical model of SAR altimeter over water surfaces,” Proc. IEEE Int. Conf. Geosci. Remote Sens. (IGARSS) Boston, U.S.A., July 7-11, 200
Raney R. K. The Delay-Doppler Altimeter 200 Briefing for the Coastal Altimetry Workshop
Reale F., F. Dentale, E. Pugliese Carratelli On the effect of wave vertical orbital velocity on Doppler Radar Altimetry, 2016 EUMETSAT Conference 2016, Darmstadt, Germany,
