Weekly-ARC Approach to Improve the Resolution of the Long-Term Crustal Movements in Japanese GPS Fixed-Point Network

For the studies of the geodynamics, International GPS Service for Geodynamics (IGS) has been producing the precise ephemerides since 1992. However the distribution of the IGS primary fiducial sites is very sparse in and around the Eastern Asia, it is afraid that the precision of the ephemeris is degraded over this area than the North American and Western European area. As a matter of fact, the repeatability of the observations of the Japanese GPS fixed-point network remains 1–2 cm level for the period of 1993 and 1994 (Shimada, 1994). In the paper we examine the Japanese local tracking data incorporated with the IGS global network solutions and the possibility of the improvement of the repeatability by the longer arc approach.