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Impulse response function for ultra-wideband SAR

Lars M. H. Ulander (Institutionen för rymd- och geovetenskap, Radarfjärranalys)
European Conference on Synthetic Aperture Radar (EUSAR), Berlin, Germany, 3-5 June 2014 p. 798-801. (2014)
[Konferensbidrag, refereegranskat]

A new impulse response function (IRF) for ultra-wideband synthetic-aperture radar (SAR) is derived based on an analytical Fourier transform pair. The latter corresponds in 2D frequency domain to a triangular area with con-stant amplitude, zero amplitude otherwise, which is used to model the SAR IRF. We show that the IRF reduces to a 2D sinc function for small aperture angles and that it is a good approximation for SAR up to about 10° of aperture angle. This IRF also generates the characteristic crossed sidelobe arms of ultra-wideband SAR from two rotated and interfering sinc functions. For aperture angles greater than about 10°, the IRF is constructed by su-perposition of adjacent triangles next to each other in frequency domain. The IRF for ultra-wideband SAR corresponding to an annulus sector is thus given by an infinite series of such triangular regions, but only a few terms are necessary for typical ultra-wideband SAR systems. About one term per 10° of aperture angle gives an accurate result.

Denna post skapades 2015-01-15. Senast ändrad 2016-05-24.
CPL Pubid: 210860


Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Radarfjärranalys (2010-2017)


Teknisk fysik

Chalmers infrastruktur