COMMAND RANGING & TELEMETRY UNIT CORTEX
Is.Rev.
Date:
© Safran Data Systems
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Safran Data Systems
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Page 12
1.4.2.2.3. Uplink Output Signal Selection
Up to two IF modulators are available (license
–dependant: one or two or no modulator enabled).
Four IFM licenses / operating modes are proposed:
1.
Video only
: the IF Modulator receives a video modulating signal for FM or PM modulation of the carrier.
2.
PCM only
: the IF Modulator receives a PCM signal for PCM/PM, PCM/FM, BPSK, QPSK or OQPSK
modulation of the carrier.
3.
Video + PCM
: the IF Modulator receives a video or/and a PCM signals and supports the modulation
schemes of the two above modes.
4.
PCM + PCM
: the IF Modulator receives two PCM signals for PCM/PM, PCM/FM, BPSK, QPSK, OQPSK
or AQPSK modulation. In QPSK, OQPSK and AQPSK mode, the first PCM signal is for I channel and
the second for Q channel.
The carrier frequency is adjustable between 66 and 74 MHz.
Performing analog filters on the IF output stage ensures proper rejection of unwanted emissions (spurious and
harmonics).
The IF Modulators board is connected to the PCI Express bus for monitoring and control by the CPU board.
1.4.2.3.
Interconnection Panel
Two models of Interconnection Panel allow for easy connection of the chassis to its environment.
1.4.2.3.1. The Integrated Interconnection Panel
The integrated Interconnection Panel provides access through BNC or SMA connectors to the main signals used
in Satellite TT&C operations:
IF Inputs
IF Outputs
IRIG-B or NASA-36 time
Reference Clock 1 & 2
Downlink auxiliary inputs
Video and AGC signals
1.4.2.3.2. The 3U Interconnection Panel
The 3U Interconnection Panel provides full access to all signals available on the Cortex CRT Quantum. These
include, in addition to the main signals described above:
Video Output 1 & 2
AGC Output 1, 2 & 3
Data & Clock Input & Output, 4 sets
Tracking signals (when delivered with a Cortex DTR configuration)
1-PPS
Miscellaneous I/O
