COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
Ref. DTU 100042
Is.Rev. 5.17
Date: Dec.
03, 2021Sept. 30, 2021
This document is the property of Safran Data Systems.
It cannot be duplicated or distributed without expressed written consent.
Note 1: decoded frames are available on TCP/IP port without synchronization word systematically.
The number of iteration is Bit rate dependant. It could be estimated by the formula:
The Payload block size is set through the Frame/block size parameter. If LDPC decoding is turned on (i.e.
LDPC RATE = 1/2, 2/3, 4/5, 7/8), this parameter is read as a number of bits. If the Payload block size does not
correspond to CCSDS standard, it will cause an alarm.
Note 2: The bad frame counter signal is just an indicator and is not considered to be exact. The additional CRC
mechanism has to be activated in order for this counter to be exact. (See section 3.3.9 Frame Verification)
Figure 35: CRT LDPC BER performance compared to CCSDS (r=1/2, k=4096)
0.01E-09
0.10E-09
1.00E-09
0.01E-06
0.10E-06
1.00E-06
0.01E-03
0.10E-03
1.00E-03
0.01E+00
0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.2 0.2 0.2 0.2
BER
Eb/No
CRT LDPC BER performance compared to CCSDS
(r=1/2, k=4096)
CCSDS CRT - BPSK - 1 Mbps CRT - BPSK - 10 Mbps
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