AN OBSERVATION OF A POSITION IN TOKYO BAY BY FKP MODE NETWORK BASED RTK-GPS

Abstract

The stability of the FKP mode RTK-GPS was tested in Tokyo Bay. As reference stations Electric Control Points(ECPs) of GSI (Geographic Survey Institute) were used. The test was conducted in three stages. First the stability of ECPs themselves has been checked for half a year from differences between authorized coordinates and daily coordinates of 14 ECPs in the Tokyo area. Secondly the coordinates of a local station located at Shin-Yokohama were continuously measured for 50 days by the FKP mode using five ECPs as reference stations located along the coast of the Tokyo Bay. Then lastly the coordinates of a moving station, a rover, set at a parking area in the midst of Tokyo-wan Aqua Line were observed using the same five ECPs for an hour. The standard deviation is 6 mm in planimetry and 11mm in height, which implies that application of FKP mode RTK is very promising for construction surveying and precise navigation.