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Correction of ionospheric and tropospheric path delay for L-band interferograms

Gomba, Giorgio and Cong, Xiaoying and Eineder, Michael (2015) Correction of ionospheric and tropospheric path delay for L-band interferograms. In: Geoscience and Remote Sensing Symposium (IGARSS), 2015 IEEE International, pp. 310-313. IEEE Xplore. IGARSS 2015, 26-31 July 2015, Milan, Italy. doi: 10.1109/IGARSS.2015.7325762.

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Abstract

The differential atmospheric path delay is a major error source in L-band interferograms. Refractivity index variations with respect to the nominal value, in the troposphere and in the ionosphere, delay the propagation of radio waves changing the slant range distance. This additional delay is superimposed to topography and ground deformation signals, hindering the measure of geophysical processes. Therefore, it needs to be corrected. In this work we present the correction results for two test cases. We mitigate the impact of height-dependent tropospheric effects (stratified delay) with a method based on the direct integration using numerical weather prediction data. We compensate the ionospheric delay using the split-spectrum method, which is based on the dispersive nature of the ionosphere and estimates the delay from the SAR data itself. Errors are reduced from almost one meter to a centimeter level.

Item URL in elib:https://elib.dlr.de/99262/
Document Type:Conference or Workshop Item (Poster)
Title:Correction of ionospheric and tropospheric path delay for L-band interferograms
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Gomba, Giorgiogiorgio.gomba (at) dlr.deUNSPECIFIED
Cong, XiaoyingTUM-LMFUNSPECIFIED
Eineder, MichaelUNSPECIFIEDUNSPECIFIED
Date:2015
Journal or Publication Title:Geoscience and Remote Sensing Symposium (IGARSS), 2015 IEEE International
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.1109/IGARSS.2015.7325762
Page Range:pp. 310-313
Editors:
EditorsEmailEditor's ORCID iD
UNSPECIFIEDIEEE Org.UNSPECIFIED
Publisher:IEEE Xplore
Status:Published
Keywords:InSAR, SAR ionospheric effects, ionosphere estimation
Event Title:IGARSS 2015
Event Location:Milan, Italy
Event Type:international Conference
Event Dates:26-31 July 2015
Organizer:IEEE
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Vorhaben Tandem-L Vorstudien (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Gomba, Giorgio
Deposited On:03 Dec 2015 08:42
Last Modified:31 Jul 2019 19:56

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