Command functions Power on/off subsystems Change subsystem operating modes Control spacecraft guidance and attitude control Deploy booms, antennas, solar cell arrays, protective covers Upload computer programs October 29. 2003 Massachusetts Institute of Technology
Command Functions • Power on/off subsystems • Change subsystem operating modes • Control spacecraft guidance and attitude control • Deploy booms, antennas, solar cell arrays, protective covers • Upload computer programs October 29, 2003 Massachusetts Institute of Technology 11
Command System rF Performance Frequencies S-band (1.6-2.2 GHZ) C-band(5.9-6. 5 ghz Ku-band(140-14.5 GHz) ·BER=10 October 29. 2003 Massachusetts Institute of Technology
Command System RF Performance • Frequencies – S-band (1.6 – 2.2 GHz) – C-band (5.9 – 6.5 GHz) – Ku-band (14.0 – 14.5 GHz) • B E R = 1 0-6 October 29, 2003 Massachusetts Institute of Technology 12