Phase calibration of TanDEM-X ATI-SAR data for sea surface velocity measurements

Anis Elyouncha; Leif E.B. Eriksson; Roland Romeiser; Lars M.H. Ulander

doi:10.1109/IGARSS.2017.8127103

Phase calibration of TanDEM-X ATI-SAR data for sea surface velocity measurements

Anis Elyouncha, Leif E.B. Eriksson, Roland Romeiser, Lars M.H. Ulander

Ocean Sciences

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

2 Scopus citations

Abstract

It has been demonstrated that Along Track Interferometric (ATI) SAR is a useful tool to retrieve ocean surface currents. The ATI SAR provides an interferometric phase (hereafter called phase) which is directly related to the Line-Of-Sight (LOS) component of the surface velocity. The accuracy of ocean currents retrieval is highly dependent on the phase processing. For instance, a properly processed phase must equal zero over static targets. The measured TanDEM-X phase rarely (if ever) satisfies this condition which indicates a phase offset independent of the surface properties. The offset can be either due to a phase synchronization issue or to using inaccurate orbital and attitude information in the processing. The objective of phase calibration is the estimation and the removal of the offset and possible trends from the measured phase. In this paper, the topographic phase is simulated using a Digital Elevation Model (DEM) and baseline information. The calibration is carried out by estimating the average of the phase over land, after topography correction, and subtracting the estimated value from the measured phase. Finally, the residual phase trend is removed using a second order polynomial fitting.

Original language	English (US)
Title of host publication	2017 IEEE International Geoscience and Remote Sensing Symposium
Subtitle of host publication	International Cooperation for Global Awareness, IGARSS 2017 - Proceedings
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	922-925
Number of pages	4
ISBN (Electronic)	9781509049516
DOIs	https://doi.org/10.1109/IGARSS.2017.8127103
State	Published - Dec 1 2017
Event	37th Annual IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2017 - Fort Worth, United States Duration: Jul 23 2017 → Jul 28 2017

Publication series

Name	International Geoscience and Remote Sensing Symposium (IGARSS)
Volume	2017-July

Other

Other	37th Annual IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2017
Country	United States
City	Fort Worth
Period	7/23/17 → 7/28/17

Keywords

ATI SAR
Ocean current
TanDEM-X
phase calibration

ASJC Scopus subject areas

Computer Science Applications
Earth and Planetary Sciences(all)

Access to Document

10.1109/IGARSS.2017.8127103

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Cite this

Elyouncha, A., Eriksson, L. E. B., Romeiser, R., & Ulander, L. M. H. (2017). Phase calibration of TanDEM-X ATI-SAR data for sea surface velocity measurements. In 2017 IEEE International Geoscience and Remote Sensing Symposium: International Cooperation for Global Awareness, IGARSS 2017 - Proceedings (pp. 922-925). [8127103] (International Geoscience and Remote Sensing Symposium (IGARSS); Vol. 2017-July). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/IGARSS.2017.8127103

Phase calibration of TanDEM-X ATI-SAR data for sea surface velocity measurements. / Elyouncha, Anis; Eriksson, Leif E.B.; Romeiser, Roland; Ulander, Lars M.H.

2017 IEEE International Geoscience and Remote Sensing Symposium: International Cooperation for Global Awareness, IGARSS 2017 - Proceedings. Institute of Electrical and Electronics Engineers Inc., 2017. p. 922-925 8127103 (International Geoscience and Remote Sensing Symposium (IGARSS); Vol. 2017-July).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Elyouncha, A, Eriksson, LEB, Romeiser, R & Ulander, LMH 2017, Phase calibration of TanDEM-X ATI-SAR data for sea surface velocity measurements. in 2017 IEEE International Geoscience and Remote Sensing Symposium: International Cooperation for Global Awareness, IGARSS 2017 - Proceedings., 8127103, International Geoscience and Remote Sensing Symposium (IGARSS), vol. 2017-July, Institute of Electrical and Electronics Engineers Inc., pp. 922-925, 37th Annual IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2017, Fort Worth, United States, 7/23/17. https://doi.org/10.1109/IGARSS.2017.8127103

Elyouncha A, Eriksson LEB, Romeiser R, Ulander LMH. Phase calibration of TanDEM-X ATI-SAR data for sea surface velocity measurements. In 2017 IEEE International Geoscience and Remote Sensing Symposium: International Cooperation for Global Awareness, IGARSS 2017 - Proceedings. Institute of Electrical and Electronics Engineers Inc. 2017. p. 922-925. 8127103. (International Geoscience and Remote Sensing Symposium (IGARSS)). https://doi.org/10.1109/IGARSS.2017.8127103

Elyouncha, Anis ; Eriksson, Leif E.B. ; Romeiser, Roland ; Ulander, Lars M.H. / Phase calibration of TanDEM-X ATI-SAR data for sea surface velocity measurements. 2017 IEEE International Geoscience and Remote Sensing Symposium: International Cooperation for Global Awareness, IGARSS 2017 - Proceedings. Institute of Electrical and Electronics Engineers Inc., 2017. pp. 922-925 (International Geoscience and Remote Sensing Symposium (IGARSS)).

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note = "Funding Information: This work was financially supported by the Swedish National Space Board (contract dnr 167/14). Data from TerraSAR-X and TanDEM-X were provided by the German Aerospace Center (DLR) under the license agreement ATI OCEA0401. We would like to thank DLR.; 37th Annual IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2017 ; Conference date: 23-07-2017 Through 28-07-2017",

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