静止衛星通信回線を利用したネットワークRTK-GPSシステムの構築に関する研究

Abstract

The accuracy of a few centimeters can be easily obtained in 2drms of the horizontal positions by RTK-GPS positioning. It is necessary, however, to provide the carrier phase data from a reference station located at a known position, to a user receiver. It is hard to purchase the expensive GPS receiver for RTK-GPS. So, the RTK-GPS users in Japan have desired the development of a more flexible, wider and less expensive carrier phase data dissemination service for a long time. In Japan, the area correction parameter FKP (flachen-korrectur-parameter; Geo++ in Germany) method has been well tested and evaluated through many projects nationwide, such as the mobile/cellular phone of the dual directional communication. Now, using the SuperBird geostationary satellite communication line, correction data transfer for the user station has tested on the RTK-GPS positioning at a fixed point before for the network-based RTK-GPS test. The SuperBird line can be disseminated the data for the wider area and the great many users simultaneously. The authors tried the RTK-GPS positioning using the correction data transmission via the SuperBird line. The investigated the RTK-GPS positioning at a fixed point in the Tokyo University of Marine Science and Technology about 5 km from the reference station. The 2drms in the horizontal positions are similar to the traditional RTK-GPS. And we must improve for the network-based RTK-GPS precise positioning in order for it to be used by the most people more easily.