| 摘要 |
PROBLEM TO BE SOLVED: To provide a system and a method which bidirectionally connects 1st and 2nd satellite communication system which operate with different protocols. SOLUTION: A 1st system uses a spread spectrum(SS) code division multiple access(CDMA) technique, and a satellite 12 functions as a repeater. A 2nd system uses a time division multiple access technique, and a protocol conversion unit 70G that is installed on the ground receives communication from either of the 1st and 2nd systems and converts transinformation into transinformation, which is suitable for the other systems. SS-CDMA transinformation is received by the 1st system, converted into a TDMA format, and further transmitted into the 2nd system. Next, communication is sent to a ground station of the 2nd system, after being relayed between at least two satellites and connected to a local public exchange telephone line network. |
