Real-Time Tomographic Inversion of Truncated Ionospheric GNSS Radio Occultations

Author:

Olivares-Pulido Germán1,Hernández-Pajares Manuel12ORCID,Monte-Moreno Enric3ORCID,Lyu Haixia4,Graffigna Victoria12,Cardellach Estel25ORCID,Hoque Mainul6ORCID,Prol Fabricio S.67ORCID,Notarpietro Riccardo8ORCID,Garcia-Fernandez Miquel9ORCID

Affiliation:

1. UPC-IonSAT, Universitat Politècnica de Catalunya, 08034 Barcelona, Spain

2. Institut d’Estudis Espacials de Catalunya (IEEC), 08034 Barcelona, Spain

3. Centre for Language and Speech Technologies and Applications, Universitat Politècnica de Catalunya (UPC-TALP), 08034 Barcelona, Spain

4. GNSS Research Center, Wuhan University, Wuhan 430079, China

5. Institute of Space Science (ICE-CSIC), 08193 Barcelona, Spain

6. German Aerospace Center (DLR), Institute for Solar-Terrestrial Physics, 17235 Neustrelitz, Germany

7. Department of Navigation and Positioning, Finnish Geospatial Research Institute, 02150 Espoo, Finland

8. European Organisation for the Exploitation of Meteorological Satellites (EUMETSAT), 64295 Darmstadt, Germany

9. Rokubun S.L., 08018 Barcelona, Spain

Abstract

This paper presents a new way of combining Abel inversion and the Chapman model with a linearly increasing scale height to retrieve ionospheric electron density vertical profiles from truncated-sounding radio-occultation data. A linear Vary–Chap model is used to cover the blind region due to data truncation, with parameters estimated by enumeration of the possible values in a grid centered around a set of parameters compatible with ionospheric physics. The resulting electron density is estimated with its corresponding error from the linear least-squares solution presenting the smaller post-fit residual on the input GNSS carrier-phase measurements. The results, tested on a set of representative GNSS RO measurements obtained by COSMIC/FORMOSAT-3, show that this method can retrieve EDVPs with a predominant absolute and relative error of 1010e−m−3 and 5%, respectively, and in less than 10 s per profile, which makes this method suitable for near real-time applications in upcoming missions such as EUMETSAT Polar System-Second Generation.

Funder

Radio-Occultation Meteorology Satellite Application Facility

EC-funded PITHIA-NRF

Publisher

MDPI AG

Subject

General Earth and Planetary Sciences

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