A ML multichannel ATI-SAR technique for measuring ocean surface velocities

Author

Lombardini, Fabrizio ; Griffiths, Hugh D. ; Gini, Fulvio

Author_Institution

Dept. of Electron. & Electr. Eng., Univ. Coll. London, UK

Volume

2

fYear

1998

fDate

28 Sep-1 Oct 1998

Firstpage

778

Abstract

Conventional along-track interferometric (ATI) synthetic aperture radars (SAR) derive the ocean surface velocity from an estimate of the phase difference between the SAR processed echoes received from two displaced phase centres with a single time-lag. A maximum likelihood (ML) algorithm is proposed to process the multi-channel SAR data from an array of phase centres with multiple time-lags. The new technique provides sensibly better estimation accuracy than the conventional one. Moreover, it provides unambiguous velocity retrieval and flexibility to ocean coherence time

Keywords

oceanographic techniques; radiowave interferometry; remote sensing by radar; synthetic aperture radar; SAR processed echoes; along-track interferometric synthetic aperture radar; estimation accuracy; maximum likelihood algorithm; multichannel ATI-SAR technique; multichannel SAR data; multiple time-lags; ocean coherence time; ocean surface velocity measurement; phase centre array; single time-lag; velocity retrieval; Doppler shift; Maximum likelihood estimation; Oceans; Phase estimation; Phased arrays; Pixel; Sea measurements; Sea surface; Synthetic aperture radar; Velocity measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

OCEANS '98 Conference Proceedings

Conference_Location

Nice

Print_ISBN

0-7803-5045-6

Type

conf

DOI

10.1109/OCEANS.1998.724344

Filename

724344