– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
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International GNSS Service (IGS)

The International GNSS Service (IGS), formerly the International GPS Service, is a voluntary federation of more than 200 worldwide agencies that pool resources and permanent GPS & GLONASS station data to generate precise GPS & GLONASS products.

The IGS is committed to providing the highest quality data and products as the standard for Global Navigation Satellite Systems (GNSS) in support of Earth science research, multidisciplinary applications, and education. The IGS currently includes two GNSS – GPS and GLONASS – and it intends to incorporate future GNSS.

The IGS provides, on an openly available basis, the highest-quality GNSS data, products and services in support of the terrestrial reference frame, Earth observation and research; positioning, navigation and timing; and other applications that benefit science and society.

The IGS makes available for use the products necessary for the best time-transfer solutions developed and used by the BIPM Time Department in the computation of UTC.

Links between the BIPM and the IGS:

  • The BIPM is a member of the IGS Governing Board and the IGS participates in the CCTF.
  • The BIPM is represented in the IGS Working Groups on Clock Products and on Bias and Calibrations.
  • The IGS provides within its products corrections and parameters necessary for the calculation of UTC/TAI. Their use allows the best statistical uncertainty (sub-nanosecond) to be achieved for time transfer.

BIPM contact(s):
IGS contact(s):
  • Mr Gary Johnston, Chair of the Governing Board
  • Ms Ruth Neilan, Director of the Central Bureau
  • Dr Michael Coleman, delegate from IGS to the CCTF