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A zeppelin experiment to study airborne altimetry using specular Global Navigation Satellite System reflections

Semmling, A. M. and Wickert, J. and Schön, S. and Stosius, Ralf and Markgraf, Markus and Gerber, T. and Ge, M. and Beyerle, Georg (2013) A zeppelin experiment to study airborne altimetry using specular Global Navigation Satellite System reflections. Radio Science, 48 (4), pp. 427-440. Wiley. DOI: 10.1002/rds.20049 ISSN 0048-6604

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This paper describes an altimetric method based on data recorded during experimental zeppelin flights over Lake Constance. Interferometric observations for this method are obtained using a Master-Slave receiver configuration. These observations contain the relative phasing of direct and reflected signals and are used for altimetry. Separated antennas are attached to the receiver to record direct and reflected signals at slant elevation angles. Filtering is required to remove direct contributions in this slant geometry. Filtered observations are corrected using an altimetric model, and thus Doppler residuals are retrieved. This correction reduces the width of the spectral reflection peak from 3 mHz to less than 10 mHz. Doppler residuals are sensitive to surface height. Lake level is estimated inversely for the residuals at different trial heights. A case study of reflection events is presented. Lake level is estimated using data from antennas with right-handed and left-handed circular polarization. Reference level is determined from tide gauge data for stations around the lake. Mean deviation of estimates from reference level is 50 cm. Doppler shifts of different model corrections are compared. The altimetric correction is the most important, with mean Doppler shifts between 316 and 560 mHz. Mean Doppler shifts are much smaller for baseline correction (less than 0.2 mHz) and water-vapor correction (0.1–1.0 mHz). In addition, the geoid undulation effect (up to 25 cm amplitude) is predicted with mean Doppler shifts between 0.1 and 0.9 mHz. Precision of Doppler residuals (0.5–0.6 mHz) is insufficient to resolve the geoid undulation effect. The resolution from phase residuals is better. The effect of geoid undulation, however, is not dominant in phase residuals.

Item URL in elib:https://elib.dlr.de/88145/
Document Type:Article
Title:A zeppelin experiment to study airborne altimetry using specular Global Navigation Satellite System reflections
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Semmling, A. M.GFZ PotsdamUNSPECIFIED
Schön, S.Institut für Erdmessung, Leibniz UniversitätUNSPECIFIED
Stosius, RalfEnviscope GmbHUNSPECIFIED
Beyerle, GeorgGFZ PotsdamUNSPECIFIED
Date:August 2013
Journal or Publication Title:Radio Science
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1002/rds.20049
Page Range:pp. 427-440
Keywords:GNSS; reflectometry; altimetry; interferometry
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):R - Vorhaben Infrastruktur und Unterstützung für Raumflugbetrieb
Location: Oberpfaffenhofen
Institutes and Institutions:Space Operations and Astronaut Training
Deposited By: Markgraf, Markus
Deposited On:11 Feb 2014 09:21
Last Modified:14 Dec 2019 04:25

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