Welcome to the Earthdata User Forum! Here, subject matter experts from several NASA Distributed Active Archive Centers (DAAC) can discuss general questions, research needs and data applications. Users can query how to access, view and interpret the data.
The "Receiver Independent Exchange Format" RINEX format was first developed by the Astronomical Institute of the University of Berne for the easy exchange of the GPS data to be collected during GPS campaigns. The format consists of six ASCII file types, observation, navigation, meteorological, GLONASS navigation, GEO navigation, and satellite and receiver clock files. Each file type consists of a header section and a data section. The maximum record length for all types is 80 bytes per record. The current version utilized by most stations is Version 2.10 for 30-second data and Version 2.20 for high-rate data. The Version 2.10 documentation contains a complete revision history as well as explanatory text.
You can find more information at the following locations: