Abstract
The orbits of the GPS satellites were determined using tracking data taken at stations in Japan. Global data by CIGNET were also used with a light weight for better geometric strength. Emphasis is put on the baseline repeatability around Japan. Short term repeatability as good as a few parts in 10 million (10-7) was achieved for each component of the baseline vector. The repeatability of the length component was better than 0.1 ppm. The results suggest that further refinement of the accuracy up to 10-8 level is possible by improving the software and by carefully choosing the locations of the tracking sites of Japan.
