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Determining the refractivity at the bottom of the atmosphere using radio occultation
Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.ORCID iD: 0000-0002-2856-6140
Molflow, SWE.
RUAG Space AB, SWE.
Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.ORCID iD: 0000-0002-6643-312x
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2017 (English)In: 2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), IEEE, 2017, p. 4433-4436Conference paper, Published paper (Refereed)
Abstract [en]

High accuracy of impact height is important to get reliableRadio Occultation (RO) measurements of the atmosphere refractivity.We have made an investigation on how accuratelywe can measure the impact height at ground level using waveoptics simulations, realistic refractivity profiles, a realisticsimulator for an advanced RO instrument including noise,and using phase matching for the inversion. The idea of theinvestigation is to increase the measurement accuracy of impactheight at low altitudes and to give reliable measurementseven in cases of super-refractive layers. We present statisticson the accuracy and precision of the determination of theimpact height at ground, as well as the resulting accuracy andprecision in the measured refractivity.

Place, publisher, year, edition, pages
IEEE, 2017. p. 4433-4436
Series
IEEE International Symposium on Geoscience and Remote Sensing IGARSS, ISSN 2153-6996
Keywords [en]
radio occultation, GPS, marine boundary layer
National Category
Meteorology and Atmospheric Sciences
Identifiers
URN: urn:nbn:se:bth-15745DOI: 10.1109/IGARSS.2017.8127984ISI: 000426954604121ISBN: 978-1-5090-4951-6 (electronic)OAI: oai:DiVA.org:bth-15745DiVA, id: diva2:1173121
Conference
2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), Fort Worth
Available from: 2018-01-11 Created: 2018-01-11 Last updated: 2019-01-10Bibliographically approved
In thesis
1. GNSS Radio Occultation Inversion Methods and Reflection Observations in the Lower Troposphere
Open this publication in new window or tab >>GNSS Radio Occultation Inversion Methods and Reflection Observations in the Lower Troposphere
2019 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

GNSS Radio Occultation (GNSS-RO) is an opportunistic Earth sensing technique where GNSS signals passing through the atmosphere are received in low Earth orbit and processed to extract meteorological parameters. As signals are received along an orbit, the measured Doppler shift is transformed to a bending angle profile (commonly referred to as bending angle retrieval), which, in turn, is inverted to a refractivity profile. Thanks to its high vertical resolution and SI traceability, GNSS-RO is an important complement to other Earth sensing endeavors. In the lower troposphere, GNSS-RO measurements often get degraded and biased due to sharp refractive gradients and other complex structures. The main objective of this thesis is to explore contemporary retrieval methods such as phase matching and full spectrum inversion to improve their performance in these conditions. To avoid the bias caused by the standard inversion, we attempt to derive additional information from the amplitude output of the examined retrieval operators. While simulations indicate that such information could be found, it is not immediately straightforward how to achieve this with real measurements. The approach chosen is to examine reflected signal components and their effect on the amplitude output.

Place, publisher, year, edition, pages
Karlskrona: Blekinge Tekniska Högskola, 2019. p. 77
Series
Blekinge Institute of Technology Licentiate Dissertation Series, ISSN 1650-2140 ; 4
Keywords
GNSS Radio Occultation (GNSS-RO)
National Category
Remote Sensing
Identifiers
urn:nbn:se:bth-17484 (URN)978-91-7295-368-0 (ISBN)
Presentation
2019-02-01, J1650, Blekinge Tekniska Högskola, Karlskrona, 09:00 (English)
Supervisors
Funder
Knowledge Foundation, 20140192Swedish National Space Board, 241/15
Available from: 2019-01-11 Created: 2019-01-10 Last updated: 2019-03-05Bibliographically approved

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Sievert, ThomasPettersson, MatsVu, Viet Thuy

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