Abstract
This paper describes methodology for assessment of minimal quality requirements for Global Navigation Satellite System (GNSS) intended for utilization in railway telematic applications. The elaborated methodology enables to provide specification of quantitative requirements for GNSS system by means of railway attributes RAMS. This process generally represents contribution for GNSS system certification, when it is necessary to demonstrate that the GNSS system meets requirements, and the system outputs are correct. In the second level, certification of the specific GNSS application must follow subsequently.
