Electron Density Retrieval From Truncated Radio Occultation GNSS Data. Issue 6 (26th June 2019)

• Record Type: Journal Article
• Authors: Lyu, Haixia; Hernández‐Pajares, Manuel; Monte‐Moreno, Enric; Cardellach, Estel
• Is Part Of: Journal of geophysical research. Volume 124:Issue 6(2019)
• Page Start: 4842
• Page End: 4851
• Publication Date: 2019-06-26
• Subjects: GNSS radio occultation -- ionospheric sounding; Magnetospheric physics -- Periodicals; Space environment -- Periodicals; Cosmic physics -- Periodicals; Planets -- Atmospheres -- Periodicals; Heliosphere (Astrophysics) -- Periodicals; Geophysics -- Periodicals; 523.01
• DOI: 10.1029/2019JA026744
• Languages: English
• ISSNs: 2169-9380

Abstract

Abstract: This paper summarizes the definition and validation of two complementary new strategies, to invert incomplete Global Navigation Satellite System Radio‐Occultation (RO) ionospheric measurements, such as the ones to be provided by the future EUMETSAT Polar System Second Generation. It will provide RO measurements with impact parameter much below the Low Earth Orbiters' height (817 km): from 500 km down approximately. The first presented method to invert truncated RO data is denoted as Abel‐VaryChap Hybrid modeling from topside Incomplete Global Navigation Satellite System RO data, based on simple First Principles, very precise, and well suited for postprocessing. And the second method is denoted as Simple Estimation of Electron density profiles from topside Incomplete RO data, is less precise, but yields very fast estimations, suitable for Near Real‐Time determination. Both techniques will be described and assessed with a set of 546 representative COSMIC/FORMOSAT‐3 ROs, with relative errors of 7% and 11% for Abel‐VaryChap Hybrid modeling from topside Incomplete Global Navigation Satellite System RO data and Simple Estimation of Electron density profiles from topside Incomplete RO data, respectively, with 20 min and 15 s, respectively, of computational time per occultation in our Intel I7 PC. Key Points: New techniques are proposed for obtaining electron density profiles from incomplete radio‐occultation data AVHIRO technique generates accuracies at 7% relative error, with computing time of 20 min in an Intel i7 standard PC SEEIRO generates accuracies at 11% relative error, about 60 times faster than AVHIRO, suitable for real‐time applications