access icon free An Improved Ionospheric Spatial Threat Model for SBAS

A conservative Grid ionospheric vertical delay error (GIVE) estimation would lead to conservative Protection levels (PLs) estimation and affects Satellitebased augmentation systems (SBAS) service performance. To reduce the margin in GIVE estimation, an improved spatial threat model is presented. A new parameter ofMinimum separation distance (MSD) is introduced. The new model is described with the MSD, Relative centroid metric (RCM) and fit radius as inputs. Ionospheric delay measurements during storms are used to construct the new spatial threat model. Simulation results show that, with the new model, there is at least 9.5% reduction in User ionospheric vertical delay errors (UIVEs), while the user ionospheric delay estimation errors can be bounded at the same time. Even on severe ionosphere disturbed days, at least 5% improvement of PLs (95%) could be achieved for more than 20% Conterminous united states (CONUS) area, leading to higher system service performance.

Inspec keywords: magnetic storms; ionospheric techniques; aerospace safety; ionospheric disturbances

Other keywords: protection level estimation; relative centroid metric; minimum separation distance; improved ionospheric spatial threat model; RCM; improved spatial threat model; storms; user ionospheric vertical delay errors; PL estimation; system service performance; GIVE estimation; satellite-based augmentation systems; SBAS service performance; MSD; grid ionospheric vertical delay error estimation; UIVE reduction; user ionospheric delay estimation errors; ionospheric delay measurements

Subjects: Ionospheric disturbances and modification experiments; Atmospheric, ionospheric and magnetospheric techniques and equipment; Instrumentation and techniques for aeronomy, space physics, and cosmic rays; Aerospace instrumentation and equipment

http://iet.metastore.ingenta.com/content/journals/10.1049/cje.2017.07.002
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