GnssType

A GnssType string consists of six parts (type, frequency, attribute, system, PRN, frequency number) represented by seven characters.

• The first three characters (representing type, frequency, and attribute) correspond to the observation codes of the RINEX 3 definition.
• The satellite system character also follows the RINEX 3 definition:
  • G = GPS
  • R = GLONASS
  • E = Galileo
  • C = BeiDou
  • S = SBAS
  • J = QZSS
  • I = IRNSS
• PRN is a two-digit number identifying a satellite.
• Frequency number is only used for GLONASS, where the range -7 to 14 is represented by letters starting with A.

Each part of a GnssType string can be replaced by a wildcard '*', enabling the use of these strings as patterns, for example to select a subset of observations (e.g. C**G** matches all GPS code/range observations). Trailing wildcards are optional, meaning L1*R is automatically expanded to L1*R***. For some RINEX 2 types (e.g. Galileo L5) the RINEX 3 attribute is unknown/undefined and can be replaced by ?, for example L5?E01.

Examples:

• C1CG23 = code/range observation, L1 frequency, derived from C/A code, GPS, PRN 23
• L2PR05B = phase observation, G2 frequency, derived from P code, GLONASS, PRN 05, frequency number -6
• *5*E** = all observation types, E5a frequency, all attributes, Galileo, all PRNs