Implementation of a New Analysis Strategy to the Routine Processing System of the Continuous GPS Network of the Geological Survey of Japan

Abstract

    We implemented a new analysis strategy for the routine GPS data analysis system of the continuous GPS network of the Geological Survey of Japan, AIST when two new continuous GPS observation stations in Shikoku and Kii Peninsula were installed in 2010. We updated the Bernese GPS software package from Version 4 to 5, and implemented some new methods such as estimation of the troposphere delay gradient as well as the zenith total delay. Comparing the result with that of the previous analysis strategy, we found that the repeatability of the GPS station coordinates were reduced especially in summer, which we inferred was due to the reduction of troposphere delay errors caused by the spatial variation of water vapor that dominated in summer season.