SGMP is an integrated research platform for utilizing numerous positioning databases. It is intended to function as a platform providing an universal access to various formats of GPS/GNSS data such as NSTB, NMEA, and RINEX. Example databases include the NSTB stations that collect GPS information continuously in tens of sites and web-available and open to public.
An introductory presentation on SGMP is here.
4) Positioning with SGMP File