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Estimation of atmospheric path delays in TerraSAR-X data using models vs. measurements


Jehle, M; Perler, D; Small, D; Schubert, A; Meier, E (2008). Estimation of atmospheric path delays in TerraSAR-X data using models vs. measurements. Sensors, 8(12):8479 -8491.

Abstract

Spaceborne synthetic aperture radar (SAR) measurements of the Earth’s surface depend on electromagnetic waves that are subject to atmospheric path delays that affect geolocation accuracy. The atmosphere influences radar signal propagation by modifying its velocity and direction, effects which can be modeled. We use TerraSAR-X (TSX) data to investigate improvements in the knowledge of the scene geometry. To precisely estimate atmospheric path delays, we analyse the signal return of four corner reflectors with accurately surveyed positions (based on differential GPS), placed at different altitudes yet with nearly identical slant ranges to the sensor. The comparison of multiple measurements with path delay models under these geometric conditions also makes it possible to evaluate the corrections for the atmospheric path delay made by the TerraSAR processor and to propose possible improvements.

Abstract

Spaceborne synthetic aperture radar (SAR) measurements of the Earth’s surface depend on electromagnetic waves that are subject to atmospheric path delays that affect geolocation accuracy. The atmosphere influences radar signal propagation by modifying its velocity and direction, effects which can be modeled. We use TerraSAR-X (TSX) data to investigate improvements in the knowledge of the scene geometry. To precisely estimate atmospheric path delays, we analyse the signal return of four corner reflectors with accurately surveyed positions (based on differential GPS), placed at different altitudes yet with nearly identical slant ranges to the sensor. The comparison of multiple measurements with path delay models under these geometric conditions also makes it possible to evaluate the corrections for the atmospheric path delay made by the TerraSAR processor and to propose possible improvements.

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21 citations in Web of Science®
26 citations in Scopus®
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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Geography
Dewey Decimal Classification:910 Geography & travel
Uncontrolled Keywords:Synthetic aperture radar; SAR; atmosphere; troposphere; ionosphere; path delay; geolocation accuracy; calibration; TerraSAR-X
Language:English
Date:2008
Deposited On:19 Jan 2009 11:20
Last Modified:26 Jan 2017 08:42
Publisher:MDPI Publishing
ISSN:1424-8220
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.3390/s8128479
Official URL:http://www.mdpi.com/1424-8220/8/12/8479
Related URLs:http://www.mdpi.net/sensors/ (Publisher)

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Licence: Creative Commons: Attribution 3.0 Unported (CC BY 3.0)

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