Frequency domain algorithm for bistatic SAR

Konferenz: EUSAR 2006 - 6th European Conference on Synthetic Aperture Radar
16.05.2006 - 18.05.2006 in Dresden, Germany

Tagungsband: EUSAR 2006

Seiten: 4Sprache: EnglischTyp: PDF

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Giroux, Vincent; Cantalloube, Hubert (ONERA - Chemin de la Huniere 91761 PALAISEAU CEDEX France)
Daout, Franck (GEA university PARIS 10 PST Villes d'Avray - 1 chemin desvallieres 92410 Villes d'Avray France)

Bistatic SAR uses transmitter and receiver flying distinct platforms. There are two main configuration types. Time invariant configuration: velocity vectors are identical and parallel to the ground. Thus, equidistance lines and lines of equal radial velocity are translated along the trajectory as time grows. Non time invariant configuration: velocity vectors are not equal. There are two principal kinds of algorithms for computing (bistatic) SAR image: temporal domain synthesis such as fast back projection or frequency domain synthesis such as w-k algorithm. The latter is more computationally efficient, particularly in monostatic case it is used in computing images with wide bandwidth. In bistatic case, w-k algorithm was proposed for time invariant case. The main idea is to use a coordinate system in which one the expression of the phase was linear. In this article we propose to fit this idea to the non time invariant case.