Abstract
The real time kinematic positioning (RTK) capability by satellite-based positioning system has been one of the main technology for the information integrated construction including construction survey, machine guidance, machine control and compaction quality control. The Ministry of Land, Infrastructure, Transport and Tourism has promoted the strategic plan for information integrated construction since 2008. With the advent of multi GNSS environment, the availability of RTK has improved under severe conditions such as urban canyon with buildings, wooded valley, and the information integrated construction by RTK has spread for several years. However, there remain some problems ; the accuracy of height by RTK does not satisfy the requirement level of road construction, it is difficult to obtain RTK fix solutions under multipath condition. Quasi Zenith Satellite System (QZSS) and other technical development are expected to contribute to solve the problems.
