Split Band Interferometry versus Absolute Ranging with Wideband SAr Systems
Bamler, Richard and Eineder, Michael (2004) Split Band Interferometry versus Absolute Ranging with Wideband SAr Systems. In: Proceedings of IGARSS 2004, CD-ROM, pp. 980-984. Geoscience and Remote Sensing Symposium, IGARSS'04, Anchorage, 20.09.2004 - 24.09.2004.
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Estimation of differential shift of image elements between two SAR images is the basis for many applications, like DEM generation or ground motion mapping. The shift measurement can be done non-ambiguously on the macro scale at the accuracy of the range resolution of the system or on the micro scale by employing interferometric methods. The latter suffers from phase cycle ambiguities and requires phase unwrapping. Modern wideband high resolution SAR systems boast resolutions as small as a few tens of a wavelength. If sufficiently many samples are used for shift estimation, the accuracy can be increased to a small fraction of a resolution cell and even in the order of a wavelength. Then accurate absolute ranging becomes precise enough to support phase unwrapping or even make it obsolete. The paper gives equations and simulation results for the achievable shift estimation accuracy for several algorithms: coherent speckle correlation, incoherent speckle correlation, split band interferometry, and correlation of point scatterers in clutter. It is shown that the performance of split band interferometry is close to the one of optimum MLE. Special Dk systems are proposed to best take advantage of the available bandwidth.
|Document Type:||Conference or Workshop Item (Speech, Paper)|
|Title:||Split Band Interferometry versus Absolute Ranging with Wideband SAr Systems|
|Journal or Publication Title:||Proceedings of IGARSS 2004|
|Page Range:||pp. 980-984|
|Series Name:||Vol. I|
|Keywords:||SAR image coregistration, differential delay estimation, speckle tracking, image correlation, delta-k interferometry, split bandwidth interferometry|
|Event Title:||Geoscience and Remote Sensing Symposium, IGARSS'04, Anchorage, 20.09.2004 - 24.09.2004|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W EO - Erdbeobachtung|
|DLR - Research area:||Space|
|DLR - Program:||W EO - Erdbeobachtung|
|DLR - Research theme (Project):||UNSPECIFIED|
|Institutes and Institutions:||Remote Sensing Technology Institute|
|Deposited By:||Cornelia Roehl|
|Deposited On:||15 Jan 2009|
|Last Modified:||06 Jan 2010 22:33|
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