2.2.2 spase://SMWG/Instrument/IGS/GPS_Receiver International GNSS Service (IGS) GPS Receiver 2019-05-05T12:34:56Z The GPS receiver in each tracking station within the International GNSS Service (IGS) global network generates raw orbit and tracking data. Among a wide range of scientific and engineering applications and studies, these data help scientists monitor the ionosphere, improving and extending the International Earth Rotation Service (IERS) Terrestrial Reference Frame (ITRF). spase://SMWG/Person/Dieter.K.Bilitza GeneralContact The International GNSS Service http://www.igs.org/ Information about IGS WaveformReceiver Global Positioning Satellites for Ionosphere Monitoring spase://SMWG/Observatory/IGS