Paper Info
Title
Efficient Evaluation of Fourier-Based SAR Focusing Kernels
Abstract
This letter addresses the efficient evaluation of Fourier-based kernels for synthetic aperture radar (SAR) image formation. The goal is to evaluate the quality of the focused impulse response function and the residual phase errors of the kernel without having to implement the processor itself nor perform a costly point-target simulation followed by the processing. The proposed methodology is convenient for situations where the assumption of a hyperbolic range history does not hold anymore, and hence, a compact analytic expression of the point target spectrum is not available. Examples where the hyperbolic range history does not apply include very high resolution spaceborne SAR imaging or bistatic SAR imaging. The approach first numerically computes the 2-D spectrum of a point target and then uses the transfer function of the focusing kernel to match it. The spectral support is then computed to adapt the spectrum to the output imaging geometry, so that the impulse response function (IRF) is finally obtained. The proposed approach is valid under the assumption of a large time-bandwidth product, as is usually the case for current air- and spaceborne SAR sensors. The methodology is validated by comparing the matched IRFs with the ones obtained using point-target simulations.
Year
DOI
Venue
2014
10.1109/LGRS.2013.2296371
IEEE Geosci. Remote Sensing Lett.
Keywords
DocType
Volume
2d point target spectrum simulation,synthetic aperture radar,optical focusing,compact analytic expression,focused impulse response function,spaceborne sar sensor,synthetic aperture radar (sar),image resolution,numerical analysis,sar simulation,sar processing,synthetic aperture radar image formation,image sensors,airborne radar,fourier-based sar focusing kernel,spaceborne sar image resolution,sar image formation,hyperbolic range history,transient response,spotlight sar,irf,residual phase error,transfer function,optical transfer function,spaceborne radar,radar imaging,geometry,bistatic sar image resolution,sar spectrum,airborne sar sensor
Journal
11
Issue
ISSN
Citations 
9
1545-598X
0
PageRank 
References 
Authors
0.34
11
6
Name
Order
Citations
PageRank
Pau Prats-Iraola133540.39
Marc Rodriguez-Cassola223329.96
Francesco De Zan312523.60
Paco López-Dekker416025.77
Rolf Scheiber557468.81
Andreas Reigber667070.53