Nonuniform azimuth image shift observed in the Radarsat images of ships in motion

Autor:	M. Iehara, Kazuo Ouchi, K. Morimura, Kumano Shintaro, I. Takami
Rok vydání:	2002
Předmět:	Synthetic aperture radar Azimuth Orbital speed Computer Science::Computer Vision and Pattern Recognition Radar imaging Hull Skew General Earth and Planetary Sciences Electrical and Electronic Engineering Rigid body Geodesy Ship motions Geology
Zdroj:	IEEE Transactions on Geoscience and Remote Sensing. 40:2188-2195
ISSN:	1558-0644 0196-2892
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::10ecdda28aa0ebba559323e540ffe4aa https://doi.org/10.1109/tgrs.2002.802478 Zobrazit plný text záznamu