Paper Info
Title
Nonuniform azimuth image shift observed in the Radarsat images of ships in motion
Abstract
This paper describes, for the first time to the authors' knowledge, the phenomenon of nonuniform azimuth image shift of a rigid body observed in the Radarsat synthetic aperture radar (SAR) images of cruising ships. The effect is caused by the different slant-range velocities of coherent scatterers across the hull associated with the ship motions. The slant-range velocity is estimated from the SAR image of an identified ship, and it is compared with that computed from a numerical model using the ship's specification and meteorological data. The result indicates that the dominant contribution to the nonuniform image shift is the pitching motion of the ship. Further comparison is made with the wave orbital velocity, and the results are shown to be in good agreement. Comparisons are also made between the SAR-derived slant-range velocities of two unknown ships and wave orbital velocities, and reasonable agreement is obtained. One of the ships' images exhibits not only nonuniform shift but also image skew. The latter skewing effect may be caused by rolling of the ship.
Year
DOI
Venue
2002
10.1109/TGRS.2002.802478
Geoscience and Remote Sensing, IEEE Transactions  
Keywords
Field
DocType
radar imaging,remote sensing by radar,ships,synthetic aperture radar,Radarsat images,SAR,coherent scatterers,cruising ships,hull,image skewing effect,meteorological data,nonuniform azimuth image shift,numerical model,pitching motion,pitching velocity,rolling motion,ship detection,ship motions,slant-range velocities,synthetic aperture radar,wave orbital velocity
Radar imaging,Ship motions,Synthetic aperture radar,Remote sensing,Orbital speed,Azimuth,Rigid body,Skew,Hull,Geodesy,Mathematics
Journal
Volume
Issue
ISSN
40
10
0196-2892
Citations 
PageRank 
References 
9
1.43
0
Authors
4
Name
Order
Citations
PageRank
Kazuo Ouchi111215.71
Iehara, M.291.43
Morimura, K.391.43
Kumano, S.491.43