Ccsds And Ecss Decoding; Ldpc Decoding; Data Output - Safran CORTEX Series User Manual

1.6.3.4

CCSDS and ECSS Decoding

Reed-Solomon decoding
Frame Header R-S decoding
De-randomization
CRC verification
CCSDS decommutation
CFDP protocol
1.6.3.5

LDPC Decoding

The LDPC (Low Density Parity Check code) decoders implemented inside the HDR are compatible with
the LPDC codes recommended by CCSDS (CCSDS 131.1-O-2, September 2007). Are available:
LDPC 7/8 (mono mode after I/Q merged or dual mode on separate I and Q outputs)
-
LDPC 1/2 1K, 4K and 16K
-
- LDPC 2/3 4K and 16K
LDPC 4/5 4K and 16K
-
The LDPC decoding is an iterative process with parity decoding. In this implementation, after the last
iteration, the parity control is processed one more time. This control is able to detect bit error before
and after decoding, and elaborates a quality "Good/Bad" status of the decoding CADU.
LDPC7/8 coding can be used in synchronous or asynchronous (alias slicing, alias transport layer...
mode).
1.6.3.6

Data Output

Type of data
Data interface
Ethernet data rate
© Safran Data Systems – IMP000074 e14r1
HIGH DATA RATE RECEIVER
HDR-4G+ USER'S MANUAL
CCSDS RS(255, 223) or RS(255, 239)
Interleave factor automatically programmed (1 to 16)
Virtual filling
R-S counters (good and bad frames, BER)
CCSDS RS(10,6)
Polynomial, initialization and offset programmable
Frame by frame
Yes (CADU, VCDU and Packet)
Yes
Raw data (frame synchronizer OFF) or frames (CADU/VCDU VC extraction
capability)
Real-time data or stored data
dual 1-Gbit Ethernet (standard), dual 10-Gbit Ethernet (option)
TCP-IP
FTP (Integrated FTP server)
in TCP/IP or UDT on LAN
>700Mbps per 1Gigabit port (dual port)
>6Gbps per 10Gbit port (dual port)
Please note that such high throughput assume no other significant traffic on the
LAN
For WAN with large round trip time, UDT solution can use, please consult
factory
Ref.
Is.Rev
Date:
Safran Data Systems
This document is the property of
It cannot be duplicated or distributed without expressed written consent.
DTU 100782
3.5
June 1, 2021
.
Page 52