Control centers continued Payload Operations Control Center Analyzes telemetry and mission data from instruments Issues commands to instruments Mission control center Plans and operates the space mission SOCC, Pocc and mcc may not be co-located May require hot spares to maintain high availability Survivability may dictate multiple ground system sites for coverage and redundancy 6/17/2004 The entire focus of the POCC is the payload, its monitoring, management and contro The mission control center would be responsible for the entire constellation of satellites The SOCC, the PoCc and the mcc are many times not co-located When the availability requirement is very high we may specify multiple systems running in parallel (hot spares )to minimize the downtime in case of a failure
Control Centers continued • Payload Operations Control Center – Analyzes telemetry and mission data from instruments – Issues commands to instruments • Mission Control Center – Plans and operates the space mission • SOCC, POCC and MCC may not be co-located • May require hot spares to maintain high availability • Survivability may dictate multiple ground system sites for coverage and redundancy 6/17/2004 6 The entire focus of the POCC is the payload, its monitoring, management and control. The mission control center would be responsible for the entire constellation of satellites. The SOCC, the POCC and the MCC are many times not co-located. When the availability requirement is very high we may specify multiple systems running in parallel (hot spares) to minimize the downtime in case of a failure. 6
Communication links Communication support required between ground system elements and data-users Landline and satellite connections International links through comsats and terminal equipment Intelsat. Telstar. Westar. DSCS. Milstar Internet protocols 6/17/2004 The communication links between the socc. the pocc and the mcc might be hrough landlines, satellite connections, or the internet. Typically military systems may use the defense Satellite Communication System to relay information between
Communication Links • Communication support required between ground system elements and data-users – Landline and satellite connections – International links through comsats and terminal equipment • Intelsat, Telstar, Westar, DSCS, Milstar – Internet protocols 6/17/2004 7 The communication links between the SOCC, the POCC and the MCC might be through landlines, satellite connections, or the internet. Typically military systems may use the Defense Satellite Communication System to relay information between nodes. 7
Data Handling Multiplex Demultiplex Encryption-Decryption Encoding-Decoding Data Compression Time Tagging · Data storage Data quality monitoring 6/17/2004 Data from the satellite are usually multi-plexed(usually Time division multiple access)to allow communication with multiple satellites over the same link We discussed these functions in the lesson on tt&c
Data Handling • Multiplex—Demultiplex • Encryption—Decryption • Encoding—Decoding • Data Compression • Time Tagging • Data storage • Data quality monitoring 6/17/2004 8 Data from the satellite are usually multi-plexed (usually Time division multiple access) to allow communication with multiple satellites over the same link. We discussed these functions in the lesson on TT&C 8
Defense Meteorology Satellite rogram Spacecraft uplink L-band(1.75 to 1.85 GHz)2 kb bps(command) Downlink S-band (2.2 to 2.3 GHz)1024 kbps(mission data) Command readout stations and aFscN Mission data transfer from ground stations to DMSP central facilities via domestic satellite and landlines Similar connections to large data processing centers Some data-users receive direct from the spacecraft 6/17/2004
Defense Meteorology Satellite Program • Spacecraft uplink – L-band (1.75 to 1.85 GHz) 2 kbps (command) • Downlink – S-band (2.2 to 2.3 GHz) 1024 kbps (mission data) • Command Readout stations and AFSCN • Mission data transfer from ground stations to DMSP central facilities via domestic satellite and landlines • Similar connections to large data processing centers • Some data-users receive direct from the spacecraft 6/17/2004 9 9