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Higher order ionospheric propagation effects on GPS radio occultation signals

Hoque, Mohammed Mainul and Jakowski, Norbert (2010) Higher order ionospheric propagation effects on GPS radio occultation signals. Advances in Space Research, 46 (2), pp. 162-173. Elsevier. DOI: 10.1016/j.asr.2010.02.013 ISSN 0273-1177

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Abstract

With the increasing number of remote sensing satellites using the GPS radio occultation technique for atmospheric sounding, the estimation of higher order ionospheric effects and their mitigation have become relevant and important. Due to long ionospheric limb paths, GPS signals are strongly affected by ionospheric refraction during radio occultation. Standard dual-frequency GPS measurements may be used to estimate the first order term of the refractive index. However, non linear terms such as the second and third order ionospheric terms and ray path bending effects are not considered in occultation measurements so far. Analysing selected CHAMP-GPS occultation events different higher order ionospheric terms are estimated and their effects on dual-frequency range estimation and total electron content (TEC) estimation are discussed. We have found that the separation between the GPS L1 and L2 ray paths exceeds the kilometer level during occultation for a vertical TEC level of more than 160 TEC units. Corresponding errors in the GPS dual-frequency range estimation and TEC estimation are found to exceed the meter and 10 TEC units level, respectively.

Item URL in elib:https://elib.dlr.de/70236/
Document Type:Article
Title:Higher order ionospheric propagation effects on GPS radio occultation signals
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hoque, Mohammed MainulMainul.Hoque (at) dlr.deUNSPECIFIED
Jakowski, NorbertNorbert.Jakowski (at) dlr.deUNSPECIFIED
Date:15 July 2010
Journal or Publication Title:Advances in Space Research
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:46
DOI :10.1016/j.asr.2010.02.013
Page Range:pp. 162-173
Publisher:Elsevier
Series Name:GNSS Remote Sensing-1
ISSN:0273-1177
Status:Published
Keywords:Higher order ionospheric terms; Radio occultation; GNSS positioning; Accurate total electron content estimation
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Vorhaben Weltraumwetter (old)
Location: Neustrelitz
Institutes and Institutions:Institute of Communication and Navigation > Navigation
Deposited By: Hoque, Mohammed Mainul
Deposited On:29 Jun 2011 10:35
Last Modified:06 Sep 2019 15:27

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