DocumentCode :
1444159
Title :
Dual-beam interferometry for ocean surface current vector mapping
Author :
Frasier, Stephen J. ; Camps, Adriano J.
Author_Institution :
Dept. of Electr. & Comput. Eng., Massachusetts Univ., Amherst, MA, USA
Volume :
39
Issue :
2
fYear :
2001
fDate :
2/1/2001 12:00:00 AM
Firstpage :
401
Lastpage :
414
Abstract :
The recent use of along-track interferometry (ATI) in synthetic aperture radar (SAR) has shown promise for synoptic measurement of ocean surface currents. ATI-SARs have been used to estimate wave fields, currents, and current features. This paper describes and analyzes a dual-beam along-track interferometer to provide spatially resolved vector surface velocity estimates with a single pass of an aircraft. The design employs a pair of interferometer beams, one squinted forward and one squinted aft. Each interferometric phase is sensitive to the component of surface Doppler velocity in the direction of the beam. Therefore, a proper combination of these measurements provides a vector surface velocity estimate in one pass of the aircraft. The authors find that precise measurements dictate widely spaced beams and that the spatial resolution for the squinted SAR is essentially identical to the sidelooking case. Practical instrument design issues are discussed, and an airborne system currently in development is described. Through computer simulation, they observe the azimuthal displacement of interferometric phases by moving surfaces identical to those of conventional SAR and find that such displacement can bias the estimated surface velocity
Keywords :
airborne radar; oceanographic techniques; remote sensing by radar; synthetic aperture radar; InSAR; SAR; airborne method; along-track interferometer; along-track interferometry; azimuthal displacement; dual-beam interferometry; dynamics; measurement technique; moving surface; ocean; radar interferometry; radar remote sensing; surface current; synoptic measurement; synthetic aperture radar; vector mapping; vector surface velocity; Aircraft; Current measurement; Instruments; Interferometry; Oceans; Sea measurements; Sea surface; Spatial resolution; Synthetic aperture radar; Velocity measurement;
fLanguage :
English
Journal_Title :
Geoscience and Remote Sensing, IEEE Transactions on
Publisher :
ieee
ISSN :
0196-2892
Type :
jour
DOI :
10.1109/36.905248
Filename :
905248
Link To Document :
بازگشت