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Mitigation of Atmospheric Delay in SAR Absolute Ranging Using Global Numerical Weather Prediction Data: Corner Reflector Experiments at 3 Different Test Sites

Cong, Xiaoying and Balss, Ulrich and Eineder, Michael (2015) Mitigation of Atmospheric Delay in SAR Absolute Ranging Using Global Numerical Weather Prediction Data: Corner Reflector Experiments at 3 Different Test Sites. In: Geophysical Research Abstracts, 17. Copernicus. EGU 2015, 12.-17. Apr. 2015, Wien, Österreich.

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Official URL: http://meetingorganizer.copernicus.org/EGU2015/orals/17193

Abstract

The atmospheric delay due to vertical stratification, the so-called stratified atmospheric delay, has a great impact on both interferometric and absolute range measurements. In our current researches [1][2][3], centimeter-range accuracy has been proven based on Corner Reflector (CR) based measurements by applying atmospheric delay correction using the Zenith Path Delay (ZPD) corrections derived from nearby Global Positioning System (GPS) stations. For a global usage, an effective method has been introduced to estimate the stratified delay based on global 4-dimensional Numerical Weather Prediction (NWP) products: the direct integration method [4][5]. Two products, ERA-Interim and operational data, provided by European Centre for Medium-Range Weather Forecast (ECMWF) are used to integrate the stratified delay. In order to access the integration accuracy, a validation approach is investigated based on ZPD derived from six permanent GPS stations located in different meteorological conditions. Range accuracy at centimeter level is demonstrated using both ECMWF products. Further experiments have been carried out in order to determine the best interpolation method by analyzing the temporal and spatial correlation of atmospheric delay using both ECMWF and GPS ZPD. Finally, the integrated atmospheric delays in slant direction (Slant Path Delay, SPD) have been applied instead of the GPS ZPD for CR experiments at three different test sites with more than 200 TerraSAR-X High Resolution SpotLight (HRSL) images. The delay accuracy is around 1-3 cm depending on the location of test site due to the local water vapor variation and the acquisition time/date.

Item URL in elib:https://elib.dlr.de/100570/
Document Type:Conference or Workshop Item (Speech)
Title:Mitigation of Atmospheric Delay in SAR Absolute Ranging Using Global Numerical Weather Prediction Data: Corner Reflector Experiments at 3 Different Test Sites
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Cong, XiaoyingTUM-LMFUNSPECIFIED
Balss, Ulrichulrich.balss (at) dlr.deUNSPECIFIED
Eineder, Michaelmichael.eineder (at) dlr.deUNSPECIFIED
Date:2015
Journal or Publication Title:Geophysical Research Abstracts
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:17
Publisher:Copernicus
Status:Published
Keywords:Atmospheric propagation delay, SAR range, corner reflector
Event Title:EGU 2015
Event Location:Wien, Österreich
Event Type:international Conference
Event Dates:12.-17. Apr. 2015
Organizer:EGU
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 hochauflösende Fernerkundungsverfahren (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Cong, Xiao Ying
Deposited On:07 Dec 2015 13:59
Last Modified:31 Jul 2019 19:57

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