Tracking telemetry control Telenet Voltages, currents, temperatures, accelerations, val ve and relay states Commanding Low data rate Store verify, execute or execute on time Programmable control Range or Range Rate Round trip delay yields range Doppler shift yields range rate Pseudo-random code Existing tt&c systems AFSCN (SGLS)-AF Satellite Control Network(Space Ground Link System) NASA DSN -Deep Space Network Intelsat/□ COMSAT TDRS- Tracking and Data Relay SatelliteTracking Telemetry & Control • Telemetry – Voltages, currents, temperatures, accelerations, valve and relay states • Commanding – Low data rate – Store, verify, execute or execute on time – Programmable control • Range or Range Rate – Round trip delay yields range – Doppler shift yields range rate – Pseudo-random code • Existing TT&C Systems – AFSCN (SGLS) - AF Satellite Control Network (Space Ground Link System) – NASA DSN - Deep Space Network – Intelsat/ COMSAT – TDRS - Tracking and Data Relay Satellite