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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 und Balss, Ulrich und 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, 2015-04-12 - 2015-04-17, Wien, Österreich.

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

Kurzfassung

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.

elib-URL des Eintrags:https://elib.dlr.de/100570/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Mitigation of Atmospheric Delay in SAR Absolute Ranging Using Global Numerical Weather Prediction Data: Corner Reflector Experiments at 3 Different Test Sites
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Cong, XiaoyingTUM-LMFNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Balss, Ulrichulrich.balss (at) dlr.dehttps://orcid.org/0009-0004-2996-6842NICHT SPEZIFIZIERT
Eineder, Michaelmichael.eineder (at) dlr.dehttps://orcid.org/0000-0001-5068-1324NICHT SPEZIFIZIERT
Datum:2015
Erschienen in:Geophysical Research Abstracts
Referierte Publikation:Nein
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Band:17
Verlag:Copernicus
Status:veröffentlicht
Stichwörter:Atmospheric propagation delay, SAR range, corner reflector
Veranstaltungstitel:EGU 2015
Veranstaltungsort:Wien, Österreich
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:12 April 2015
Veranstaltungsende:17 April 2015
Veranstalter :EGU
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erdbeobachtung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben hochauflösende Fernerkundungsverfahren (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Methodik der Fernerkundung > SAR-Signalverarbeitung
Hinterlegt von: Cong, Xiao Ying
Hinterlegt am:07 Dez 2015 13:59
Letzte Änderung:24 Apr 2024 20:05

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