Safran CORTEX CRT Quantum - Page 174

COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
Ref. DTU 100042
Is.Rev. 5.17
Date: Dec.
03, 2021Sept. 30, 2021
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Page 94
c- External Input to Viterbi Decoders (TMU table/offset 26 = 2. GUI: Frame Sync. Input = Ext. Vit.
1):
Differential
decoder
Frame
Synchronizer
Differential
encoder
I out
AQPSK
demodulator
& B/S
IF inputs
Aux. inputs
Viterbi
decoder
(Option)
I
Q
Differential
decoder
Viterbi
decoder
I
Differential
encoder
I out
(Option)
Frame
Synchronizer
.
.
(Option)
(Option)
invert/
swap
invert/
swap
I in
I in
Figure 44: TM Chain : I/O Ports (HBW direct PCM AQPSK Decoding)
 Phase ambiguity is solved by the frame synchronizers or by the Differential Decoders when
available.
 Test points and external input to the Frame Synchronizer or Viterbi Decoder are available if
two of the downlink data I/Os Test Sets are enabled. See section 2.3.4.2, Annex 5 and
TMU monitoring table, status offset 26 for more details.
 Hard decision applies to external input to the Viterbi decoders (scenario c).
 Auxiliary inputs: restricted to noise & spurious-free signal with limited amplitude variations.
 Direct input to the Bit Synchronizer: Not available.