Range Focusing in Volumetric SAR: a Phase Recovery Approach

Konferenz: EUSAR 2016 - 11th European Conference on Synthetic Aperture Radar
06.06.2016 - 09.06.2016 in Hamburg, Germany

Tagungsband: EUSAR 2016

Seiten: 4Sprache: EnglischTyp: PDF

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Yaghoobi, Mehrdad; Kelly, Shaun; Davies, Mike E. (University of Edinburgh, UK)

Synthetic aperture radar (SAR) systems have been introduced to essentially increase the azimuth resolution. This has been possible by coherently combining the range compressed information along the flying track. The key point is to have a set of calibrated measurements. While the problem of calibration and digitally focusing of the pulses, collected along a single pass, has been significantly investigated, there has been very little attention to the multipass scenario. In this setting the range estimation error can be generally larger and, as a result, conventional range focusing techniques will normally fail to correct such errors. We here investigate the problem of volumetric SAR, where a set of range compressed pulses are provided by multipass circular trials. We demonstrate that the range estimation error causes some structured phase errors, which can be then formulated as a phase recovery problem. We introduce a new range focusing method using Gerchberg-Saxton type phase recovery. We finally show that the new technique is capable of correcting the range error up to a small offset.