Canadian Active Control System (CACS) data file naming conventions

Observational Data

RINEX data retrieved via the CSRS Online Database use the following naming convention "SSSSDDDF.YYT"   where:

  • "SSSS"  - refers to the site 4 character ID e.g. ALGO
  • "DDD" -  refers to the day of the year
  • "F" -  refers to the file sequence number within day 0: file contains all the existing data of the current day
  • "YY" - refers to the year
  • "T" - refers to the file type:
          O: Observation file
          N: Navigation file
          M: Meteorological data file
          G: GLONASS Navigation file

Ephemerides

GPS satellite ephemerides may be retrieved via the CSRS Online Database use the following file naming convention "EPDDDYYT.FFF" where:

  • "EP" - refers to EPhemerides
  • "DDD" -  is the day of the year e.g. 045 for Feb. 14
  • "YY" -  is the year e.g. 96
  • "T" - indicates the type of solution: P for Precise (i.e. final) and R for Rapid
  • "FFF" - indicates the file format e.g. SP3

Clock Corrections

GPS Satellite Clock Corrections use the following file naming convention is used "CKDDDYYT.CLK" where:

  • "CK"  -  refers to ClocKcorrections
  • "DDD"  -  is the day of the year i.e. 045 for Feb. 14
  • "YY" -  is the year i.e. 96
  • "T" - indicates the type of ephemerides used in the computation: "P" -  for Precise (i.e. final)  "R" -  for Rapid
  • "CLK"  - indicates type of file.

Precise satellite clock file field description:

Field # Field Description (code or units)
1 Record type (c=clock)
2 Processing centre (emr)
3 Satellite identifier (PRN number)
4 Time of satellite clock estimate (year, month, day, hour, minute, second)
5 Estimated satellite clock offset (seconds)
6 Precision of clock offset (seconds)