Exhibit B
of
two
operating channels
Of RF reception, identical, simultaneously demodulation and decoding hardware with the exception of the antenna and RF feeds. Together with the telemetry subsystem, the command subsystem shall form part of a range measuring system for the transfer and drift orbits.
Commands
!
The TT&C subsystem shall include all commands required to operate the communications satellite and the communications payload.
Precludance of Accepting a False Command
that
a
the TT&C operator correct command has been
The TT&C subsystem shall be configured such that receives, via telemetry, acknowledgement received before the command is executed.
6.2 Operation
The command subsystem shall be operable prior to launch and provide capability as may be required during prelaunch checkout and launch phase operations. The command subsystem shall provide for all necessary control during the transfer orbit and synchronous injection maneuvers.
6.3 Radio Frequency
at
Command transmission shall be at a frequency of 6422 MHz during on station operation and
a frequency of 5928.0 MHz during transfer orbit operations. Filtering shall be provided in the communications transponder to prevent harmful retransmission of the command carrier by the satellite.
6.4 Modulation
Wide deviation frequency modulation shall be used.
6.5 Sensitivity
2
The command subsystem shall be fully operational at a flux density a the spacecraft of -80) dBW/m2 via the omnidirectional antenna and -90 dBW/m2 via the communications antenna.
-85
6.6 Format
A tone digital
digital format is used, including spacecraft address separate execute capability.
and
6.7
Command Security
commands being executed,
in the spacecraft and
all
Το reduce the possibility of false commands are capable of being temporarily stored verified on the ground prior to execution.
し
B-23
ν
No comments yet.
Private notes are available after approval.