Turbo-Code; Table 24: Turbo Code - Safran CORTEX CRT Quantum User Manual

3.4.3.3.4. Turbo-Code

This processing provides the capabilities corresponding to the encoding recommended in § 5 of CCSDS 131.0-
B-3. The corresponding decoding is license dependent. The minimum code rate: 1/2, 1/3, 1/4 or 1/6 is resource
dependent.
The Turbo-encoding is available in the File, Pseudo and BERT File operating modes.
It is activated by programming the parameter Frame Encoding to Turbo-code. The frames are generated by
using the parameters Frame Length and Turbo Code Rate of the TMU associated owing to the parameter TM
Flow for BER/Encoding. In the particular case of Turbo decoding, the TMU Frame Length has to be configured
with the uncoded information block length,
the TMU Turbo Code Rate.
information
block length
bits [bytes]
code rate
1784
[2231]
3568
[2232]
7136
[2234]
8920
[2235]
sync. marker length
In Pseudo mode, the Frame Length of the associated TMU must be configured with the information block length
expressed in bits. The length of (sync. Marker + Turbo codeblock) is given by the formula:
© Safran Data Systems
COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
ASM
ASM
ASM
Figure 62: TMS File structure for Reed-Solomon encoding
expressed in
1/2
3576 [447]
7144 [893]
14280 [1785]
17848 [2231]
64
Table 24: Turbo code : information block and codeblock lengths
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Uncoded transfer frame #1
Check Symbols
Uncoded transfer frame #2
Check Symbols
Uncoded transfer frame #N
Check Symbols
bits. The Sync. Marker is automatically deduced from
codeblock length
bits [bytes]
1/3
5364 [670.5] 7152
10716 [1339.5] 14288
21420 [2677.5] 28560
26772 [3346.5] 35696
96
1
(32 + �� + 4)
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Safran Data Systems
.
Ref. DTU 100042
Is.Rev. 5.17
Date: Dec.
03, 2021Sept. 30, 2021
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[894] 10728
[1786] 21432
[3570] 42840
[4462] 53544
128 192
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