Interferometry using Phase Slope Estimation
Conference: EUSAR 2016 - 11th European Conference on Synthetic Aperture Radar
06/06/2016 - 06/09/2016 at Hamburg, Germany
Proceedings: EUSAR 2016
Pages: 4Language: englishTyp: PDF
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Authors:
Synnes, Stig A. V. (Norwegian Defence Research Establishment (FFI), PO Box 25, 2027 Kjeller, Norway & University of Oslo (UiO), Department of Informatics, PO Box 1080, Blindern, 0316 Oslo, Norway)
Saebo, Torstein O.; Hansen, Roy E. (Norwegian Defence Research Establishment (FFI), PO Box 25, 2027 Kjeller, Norway)
Abstract:
The terrain elevation can be estimated with active radar and sonar by observing the scene from vertically displaced sensors and estimating the difference in time of arrival of the signal returns. A high precision estimate is available from the phase difference between preregistered time series. This estimate has an inherent 2pi wrap ambiguity, but the dynamics over the signal bandwidth can be used to estimate the correct wrap. Common absolute phase estimators based on either cross-correlation or the phase slope between sub-band images, depend on either spatial smoothing or down-sampling. We propose a generalization of the sub-band methods for phase slope estimation that has the potential of providing absolute phase estimates at full image resolution.