静止衛星による測位システム-III : 測位システムの構築

概要

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A regional positioning system is proposed, composed from two geostationary satellites, the center and mobile stations. TDMA (Time Division Multiple Access) satellite communication system is used to transmit the position data of satellites and synchronize the clock of the mobile station with that of the center station in order to find the absolute ranges to the satellites. The TDMA communication helps to keep a rough synchronization with the clock of the center station. The mobile station sends a signal to require the synchronization and the center station answers it with the time difference measured there between the both stations to make the precise clock synchronization. The authors evaluate the accuracy of time synchronization to be about 10ns by the data once measured between VSATs (Very Small Aperture Terminal) of the both stations. Then they evaluate the positioning accuracy of ship to be less than 28m when measured on the Japanese Islands and in the surrounding waters.
社団法人日本航海学会の論文
1999-09-25