BIDIRECTIONAL RADIO COMMUNICATION METHOD AND EQUIPMENT THEREOF BETWEEN FIXED BASE TERMINAL AND MOVABLE TERMINAL USING PLANETARY SCATTERING SIGNAL FOR UPPER COMMUNICATION FROM MOVABLE TERMINAL THROUGH LORAN COMMUNICATION SIGNAL, WHICH IS COMBINED WITH LORAN NAVIGATION TRANSMISSION, AND LOWER COMMUNICATION FROM BASE TERMINAL

摘要

PURPOSE: To improve the reliability of communication between a fixed base and a movable user by combining Loran navigation communication technology with meteor diffusion communication technology. CONSTITUTION: This system comprises, for example, three Loran base positions 1, 2, 3 and four meteor scatter base position terminals 4, 5, 6, 7. The Loran base position 1 is arranged adjacently to a vehicle position automatic finding (AVL) center, and connected to the AVL center by a telephone cable or optical fiber 1'. Further, five movable terminals (vehicles) 9, 10, 11, 12, 13 have Loran receivers LR, and also meteor scatter transceivers M-Tx-Rx. The AVL center has a system MON for monitoring the positions of the movable terminals in addition to the meteor scatter transceivers M-Tx-Rx. According to this structure, an additional communication data is used for Loran broadcasting navigation signal, and subordinate transmission of information from the base terminal to the movable user can be performed by use of meteor scatter.