A study on the reliability improvement for applying GNSS to railroad system

초록

GNSS(Global Navigation Satellite) is world-wide positioning infrastructure using navigation satellite, applied to various positioning applications (e.g. current transportation systems). It is required for GNSS based system to which applied safety-relate system such as aviation, railway system to ensure higher reliability and safety. Currently operating GNSS is GPS(Global Positioning System) of U.S. but GPS does not provide integrity information directly to user. European GNSS, GALIEO is in the process of development in Europe and is expected to provide system level integrity information through SoL(Service of Life) service. In Korea, the research on ground based augmentation system and its applicability to railway has been undertaken to ensure the integrity of GPS SIS. In this paper, we analyze integrity information of Korean augmentation system and the reliability of KORAIL(Korean Railway Operator)-ATP positioning system used in railway field. Then, we suggest dual-mode GNSS configuration method applicable to train control which safety and reliability of higher level are required. We also evaluate reliability and safety of the method by calculating dangerous failure rate and service failure rate.