Performance Assessment of Second-Generation SBAS Prototype in Thailand

Abstract

This study evaluates the preliminary performance of the dual-frequency multi-constellation satellite-based augmentation system (DFMC SBAS) prototype that was deployed in Thailand, focusing on key performance indicators such as positional accuracy and continuity. To this end, real data that was collected from 4, 8, and 12 ground tracking stations in Thailand was used to calculate SBAS corrections for the periods of January 1–7, April 1–7, August 1–7, and December 1–7, 2023. The accuracy of these corrections for single-point positioning was then tested using data from 20 continuously operating reference stations (CORS) in the region. The results showed that the correction data that was derived from the data from the 8 and 12 ground tracking stations significantly improved the efficiency of the single-point positioning, thus meeting the required standards for Category I (CAT-I) aviation operations. This initial assessment provides a solid foundation for the continued development of a fully operational DFMC SBAS that is tailored to Thailand’s specific requirements.