Welcome to the Earthdata Forum! Here, the scientific user community and subject matter experts from NASA Distributed Active Archive Centers (DAACs), and other contributors, discuss research needs, data, and data applications.
The file https://cddis.gsfc.nasa.gov/archive/gnss/data/daily/yyyy/ddd/yyn/brdcddd0.yyn.Z (yyyy is the 4-digit year, ddd is the three-digit day of year and yy is the two-digit year) is the daily broadcast ephemeris file. This file is a merge of the individual site navigation files into one, non-redundant file that can be utilized by users instead of the many individual navigation files. These files are also available in yearly subdirectories of https://cddis.nasa.gov/archive/gnss/data/daily/yyyy/brdc/.