Telemetry, Tracking and Command Subsystem in Advanced Land Observing Satellite

This report presents the TT&C (Telemetry, Tracking and Command Subsystem), that will be installed on the ALOS (Advanced Land Observing Satellite) to b e launched in 2003. TT&C was designed to provide 1) using of USB/SSA-Transp onder, 2) two-way link, for packet transfer of telemetry and command, based on AOS (Advanced Orbiting System) recommendations, which were prepared by the CCSDS (Consultative Committee for Space Data Systems), and 3) applying of U-SDB (Unified Satellite Data Bus) for the data handling system in orbit , which uses the time sharing multiplexing method of MIL-STD-1553B and the protocol of CCSDS Path service.