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Comparing reflection signatures in radio occultation measurements using the full spectrum inversion and phase matching methods
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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2018 (English)In: PROCEEDINGS VOLUME 10786; Remote Sensing of Clouds and the Atmosphere XXIII / [ed] Comeron A.,Kassianov E.,Picard R.H.,Schafer K.,Weber K., SPIE - International Society for Optical Engineering, 2018, article id 107860AConference paper, Published paper (Refereed)
Abstract [en]

Global Navigation Satellite System Radio Occultation (GNSS-RO) is an important technique used to sound the Earth's atmosphere and provide data products to numerical weather prediction (NWP) systems as well as toclimate research. It provides a high vertical resolution and SI-traceability that are both valuable complements toother Earth observation systems. In addition to direct components refracted in the atmosphere, many received RO signals contain reflected components thanks to the specular and relatively smooth characteristics of the ocean. These reflected components can interfere the retrieval of the direct part of the signal, and can also contain meteorological information of their own, e.g., information about the refractivity at the Earth's surface. While the conventional method to detect such reflections is by using radio-holographic methods, it has been shown that it is possible to see reflections using wave optics inversion, specically while inspecting the amplitude of the output of phase matching (PM). The primary objective of this paper is to analyze the appearance of these reflections in the amplitude output from another wave optics algorithm, namely the much faster full spectrum inversion (FSI). PM and FSI are closely related algorithms - they both use the method of stationary phase to derive the bending angle from a measured signal. We apply our own implementation of FSI to the same GNSS-RO measurements that PM was previously applied to and show that the amplitudes of the outputs again indicate reflection in the surface of the ocean. Our results show that the amplitudes output from the FSI and PM algorithms are practically identical and that the reflection signatures thus appear equally well.

Place, publisher, year, edition, pages
SPIE - International Society for Optical Engineering, 2018. article id 107860A
Keywords [en]
radio occultation, wave optics, re ections, full spectrum inversion
National Category
Meteorology and Atmospheric Sciences Signal Processing
Identifiers
URN: urn:nbn:se:bth-17132DOI: 10.1117/12.2325386ISI: 000453909700007ISBN: 9781510621558 OAI: oai:DiVA.org:bth-17132DiVA, id: diva2:1256143
Conference
Remote Sensing of Clouds and the Atmosphere XXIII 2018; Berlin; Germany; 12 September 2018 through 13 September 2018
Available from: 2018-10-16 Created: 2018-10-16 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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Publisher's full texthttps://www.spiedigitallibrary.org/conference-proceedings-of-spie/10786/107860A/Comparing-reflection-signatures-in-radio-occultation-measurements-using-the-full/10.1117/12.2325386.short

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Sievert, ThomasPettersson, MatsVu, Viet Thuy

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