MOBILE BODY-SATELLITE COMMUNICATION SYSTEM

摘要

PROBLEM TO BE SOLVED: To miniaturize a mobile body device and to simplify a mobile body position information collection system as a whole that collects positioned information of a mobile body in a center base station via a satellite. SOLUTION: In this mobile body position information collection system consisting of a plurality of position information satellites for navigation 9, that transmits time reference information with high accuracy, an on-ground mobile body 1 provided with a receiver to obtain its own position information, on the basis of the time reference information received from a plurality of the satellites 9 and satellite orbit information obtained in advance and a center base station that collects the obtained position information of the mobile body 1 that is obtained via the satellites, any of a plurality of the position information satellites for navigation 9 is provided with a transmitter/receiver that relays information to the center base station and a time information receiving antenna of the on-ground mobile body is used also as an information relay antenna. Furthermore, a CDMA system is adopted fro a two way communication method for relaying information to the center base station.