engleski

Influence of the Inbuilt Tropospheric Corrections to GPS Positioning Performance

Satellite navigation has become a component of national infrastructure, with a growing number of applications, systems and services relying upon its Positioning, Navigation and Timing (PNT) services performance. Throughout the years, the main sources of the absolute GPS positioning error budget were identified, with the aim to determine the influence of the inbuilt tropospheric corrections to GPS positioning performance. The GPS tropospheric delay is commonly understood a minor and often negligible GPS positioning error source for various applications. Here we examine the foundations of that presumption through analysis of the real GPS positioning performance as experienced by a commercial-grade single-frequency GPS receiver with utilisation of several tropospheric correction scenarios (no correction, Saastamoinen). The study was based on real raw GPS pseudorange observations that were later post-processed using a GPS Software Defined Radio (SDR) that simulates a real receiver. Test period was 24 hours. Ionospheric corrections were not applied. We found noticeable effects of GPS tropospheric delay on GPS positioning performance for categories of various GPS applications, importance of tropospheric delay correction model deployment, and staged subject for future research aimed at improvement of GNSS positioning performance. Ionospheric corrections for this work are not included but also they could be included in some other paper because in this paper we are arguing about the difference (Delta) between the corrected and uncorrected tropospheric delay.

GNSS ; positioning performance deterioration ; tropospheric correction

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