GEODETIC and ASTROMETRIC OBSERVATIONS

• Use group delays from wide spanned bandwidths

  • Use “totals” with correlator model added back in

• Use dual frequency (S/X) to remove ionosphere

• Can do global fits to all historical geodesy data

• Fits include:

  • Antenna and source positions
  • Earth orientation (UT1-UTC, nutation, …)
  • Time variable atmosphere and clocks
  • Many other possible parameters

• Observing by service groups

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