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Determining the refractivity at the bottom of the atmosphere using radio occultation
Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för matematik och naturvetenskap.ORCID-id: 0000-0002-2856-6140
Molflow, SWE.
RUAG Space AB, SWE.
Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för matematik och naturvetenskap.ORCID-id: 0000-0002-6643-312x
Vise andre og tillknytning
2017 (engelsk)Inngår i: 2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), IEEE, 2017, s. 4433-4436Konferansepaper, Publicerat paper (Fagfellevurdert)
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.

sted, utgiver, år, opplag, sider
IEEE, 2017. s. 4433-4436
Serie
IEEE International Symposium on Geoscience and Remote Sensing IGARSS, ISSN 2153-6996
Emneord [en]
radio occultation, GPS, marine boundary layer
HSV kategori
Identifikatorer
URN: urn:nbn:se:bth-15745DOI: 10.1109/IGARSS.2017.8127984ISI: 000426954604121ISBN: 978-1-5090-4951-6 (digital)OAI: oai:DiVA.org:bth-15745DiVA, id: diva2:1173121
Konferanse
2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), Fort Worth
Tilgjengelig fra: 2018-01-11 Laget: 2018-01-11 Sist oppdatert: 2019-01-10bibliografisk kontrollert
Inngår i avhandling
1. GNSS Radio Occultation Inversion Methods and Reflection Observations in the Lower Troposphere
Åpne denne publikasjonen i ny fane eller vindu >>GNSS Radio Occultation Inversion Methods and Reflection Observations in the Lower Troposphere
2019 (engelsk)Licentiatavhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Karlskrona: Blekinge Tekniska Högskola, 2019. s. 77
Serie
Blekinge Institute of Technology Licentiate Dissertation Series, ISSN 1650-2140 ; 4
Emneord
GNSS Radio Occultation (GNSS-RO)
HSV kategori
Identifikatorer
urn:nbn:se:bth-17484 (URN)978-91-7295-368-0 (ISBN)
Presentation
2019-02-01, J1650, Blekinge Tekniska Högskola, Karlskrona, 09:00 (engelsk)
Veileder
Forskningsfinansiär
Knowledge Foundation, 20140192Swedish National Space Board, 241/15
Tilgjengelig fra: 2019-01-11 Laget: 2019-01-10 Sist oppdatert: 2019-03-05bibliografisk kontrollert

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