GPS試験観測-半固定GPS観測システムと試験観測

For the monitoring of crustal movements and the long-term earthquake prediction, GPSobservation systems were introduced into Japanese universities and institutes in 1988. Thisreport gives the detailed description of the semi-fixed GPS observation system introduced intoD.P.R.I., Kyoto University and the results of some experimental GPS obesrvations. Thepreliminary results, which are derived from only a few observations, show the order of 1 ppmor better repeatability of GPS measurements in 1988, when the constellation of the GPSsatellites over Japan is not so good.