Modeliranje ionosferske refrakcije za izboljšavo absolutnega GNSS-položaja s kodnimi instrumenti: priprava na 24. sončev cikel

Ionosperic refraction modeling for better autonomous GNSS code positioning: in preparation of solar cycle 24

Author(s):

Oskar Sterle, Bojan Stopar, Polona Pavlovčič Prešeren

Abstract:

This paper describes GNSS-processing optimisation for better autonomous single-point positioning using single frequency code receivers. GNSS processing improvement is carried out in terms of near-real time ionosphere delay modelling, which will be crucial during the upcoming 24th maximum solar cycle. The main scope of this article is to examine how sudden changes in the ionosphere, caused by events on the Sun, affect autonomous single-point positioning in simple navigation tasks. Further, the specific method of ionosphere delay modelling from actual two-frequency receivers, acquiring carrier phase and code observations, is shown. The modelled value of the ionospheric refraction, which is given in GNSS path delay, is further used in point positioning from single-frequency code instruments. In addition, we show the advantage of GNSS permanent stations that can supply a wide range of users with better ionosphere data in near real time. From actual experiments, the magnitude of the ionospheric impact on each specific 3D position component is shown and further improved using modelled ionosphere delay values. Finally, we show how to improve GNSS position determination from simple single- or two-frequency GNSS code or carrier-phase receivers in differential GNSS method. This study was conducted for preparations for the upcoming solar cycle maximum, expected to be held in May 2013.

Keywords:

GNSS-processing, 24th solar cycle, code GNSS receivers, autonomous single-point positioning, ionospheric refraction modelling, differential GNSS

DOI: 10.15292/geodetski-vestnik.2013.01.009-024

Citation:

Oskar Sterle, Bojan Stopar, Polona Pavlovčič Prešeren (2013). Modeliranje ionosferske refrakcije za izboljšavo absolutnega GNSS-položaja s kodnimi instrumenti: priprava na 24. sončev cikel. | Ionosperic refraction modeling for better autonomous GNSS code positioning: in preparation of solar cycle 24. Geodetski vestnik, 57 (1), 9-24. DOI: 10.15292/geodetski-vestnik.2013.01.009-024