A Study on the Radial Velocity Information obtained from SAR Subapertures

Konferenz: EUSAR 2012 - 9th European Conference on Synthetic Aperture Radar
23.04.2012 - 26.04.2012 in Nuremberg, Germany

Tagungsband: EUSAR 2012

Seiten: 4Sprache: EnglischTyp: PDF

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Radius, Andrea (Edisoft S.A., Portugal)
Marques, Paulo (Instituto de Telecomunicações – Pólo Lisboa, ISEL, Portugal)

Although in the last years many techniques for moving target indication (MTI) were developed for multi-channel SAR systems, there are only a very small number of platforms with multi-channel capabilities. Furthermore, for civil applications only single channel data is typically made available. It is well known that the velocity estimation with a single channel is a challenging problem having several limitations. To take the most out of this kind of data it is necessary to use all of its informative content. This paper investigates the information that can be retrieved from symmetrical sub-apertures to estimate the radial velocity and to analyze the effects that the target motion has on the SAR Impulse Response Function (IRF) in phase and amplitude. It is shown that the radial motion does not generate relevant phase and amplitude difference in the sub-apertures; the only informative content is contained in the spatial shift of the peak of IRF.