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Name Template: PUB/MISSION/level1a/ionObs/ionObs_YYYY.DDD.LLL.NN.TT_rnx

DDDDay of year
LLLLEO id (1-999)
MISSIONMission ID (eight characters or less--champ, champrt, sacc, sacctst, etc)
NNdump number (1-99)
PUBBase directory for the pub hierarchy
TTAntenna ID
YYYYYear

Low rate GPS data (1 sec for CHAMP) in RINEX 2.20 format. These data reflect the coresponding ionGps BINEX files. See http://www.aiub.unibe.ch/download/rinex/rnx_leo.txt for details on RINEX 2.20 format.