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Evaluating VHF-Band SAR Autofocus Algorithms using a Forest Backscatter Model

Annelie Wyholt (Institutionen för radio- och rymdvetenskap, Radarfjärranalys) ; Lars M. H. Ulander (Institutionen för radio- och rymdvetenskap, Radarfjärranalys)
2009 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2009; Cape Town; South Africa; 12 July 2009 through 17 July 2009 Vol. 4 (2009), p. 9-12.
[Konferensbidrag, refereegranskat]

The objective of this paper is to assess the accuracy of an autofocus method developed for the Fast Factorized Back-Projection (FFBP) algorithm in simulated scenarios. We specifically address the question whether correlation measurements between subimages will suffice in the focusing process in one arbitrary merging step. A forest clutter model is used together with a model of the impulse responses to simulate two SAR sub-images of a forest. Correlation is used for sub-image matching and residual displacement errors are compiled using simulation. We conclude that the matching error increases with increased number of trees per resolution cell but can be restored with a larger image size in the correlation measurements. We also conclude that the autofocus method will be successful.

Nyckelord: SAR, Autofocus, VHF-Band, Back-Projection


Article number 5417608



Denna post skapades 2009-11-19. Senast ändrad 2016-07-13.
CPL Pubid: 101892

 

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Institutioner (Chalmers)

Institutionen för radio- och rymdvetenskap, Radarfjärranalys (2005-2010)

Ämnesområden

Signalbehandling
Elektroteknik

Chalmers infrastruktur