Safran CORTEX Series User Manual page 6

3.3.8 PRN-BER Computation ............................................................................................................................ 108
3.3.8.1 BER on Separate I & Q Channels ......................................................................................................... 108
3.3.8.2 BER on Merged I & Q Channels .......................................................................................................... 108
3.3.9 Digital Outputs ......................................................................................................................................... 109
3.3.10 Doppler and Integrated Phase Measurement ........................................................................................ 110
3.3.10.1 Introduction ......................................................................................................................................... 110
3.3.10.2 Required setup for optimal performance............................................................................................. 110
3.3.10.3 Sampling rate ...................................................................................................................................... 111
3.3.10.4 Accumulated Phase Format ................................................................................................................ 112
3.3.10.5 Displaying the carrier offset of the Doppler port in the DMU window .............................................. 115
3.3.10.6 Interpolation Process ........................................................................................................................... 116
3.3.10.7 Doppler Computing ............................................................................................................................ 116
3.3.10.8 Impact of Phase Errors on Doppler Computing .................................................................................. 117
3.3.10.9 Sampling Period Resolution................................................................................................................ 117
3.3.10.9.1 Error Due to Computing .................................................................................................................. 117
3.3.10.9.2 Error Due to Floating Representation .............................................................................................. 118
3.3.11 Es/N0 estimators in DVB-S2 and SCCC environment ........................................................................... 118
3.3.11.1 Warning............................................................................................................................................... 118
3.3.11.2 Standard Es/N0 estimation .................................................................................................................. 118
3.3.11.3 Data-aided Es/N0 estimation in SCCC and DVB-S2 ......................................................................... 120
3.4 D P
ATA ROCESSING
3.4.1 Functional Breakdown of the Data Processing Unit ............................................................................... 123
3.4.2 Frame Synchronization & Ambiguity Resolution ..................................................................................... 124
3.4.2.1 Frame Synchronization Strategy ........................................................................................................... 124
3.4.2.2 Frame Synchronizer Input ..................................................................................................................... 125
3.4.2.3 Automatic PSK Ambiguity Resolution ................................................................................................. 125
3.4.3 CCSDS Data De-randomizer ................................................................................................................... 126
3.4.4 Customized Data De-randomization ........................................................................................................ 127
3.4.5 CRC Frame Checking .............................................................................................................................. 128
3.4.6 (255,223) Reed-Solomon Decoding ......................................................................................................... 128
3.4.7 (255,239) Reed-Solomon Decoding ......................................................................................................... 129
3.4.8 (10,6) Reed-Solomon Frame Header Decoding ....................................................................................... 129
3.4.9 Specific Decoding ..................................................................................................................................... 129
3.4.10 LDPC Decoding ..................................................................................................................................... 130
3.4.10.1 Introduction ......................................................................................................................................... 130
3.4.10.2 LDPC 7/8 for near-earth applications ................................................................................................. 130
3.4.10.3 AR4JA LDPC ½, 2/3, 4/5 codes for deep space applications ........................................................... 130
3.4.10.4 Implementation ................................................................................................................................... 130
3.4.10.5 Performances ....................................................................................................................................... 131
3.4.11 Recording and Data Transmission over Ethernet .................................................................................. 131
3.4.11.1 General consideration ......................................................................................................................... 131
3.4.11.2 Data Storage ........................................................................................................................................ 131
3.4.11.3 TCP-IP Data Recovery........................................................................................................................ 132
3.4.11.4 Archiving and FTP Recovery ............................................................................................................. 133
3.4.11.4.1 Generality ......................................................................................................................................... 133
3.4.11.4.1.1 Overview ....................................................................................................................................... 133
3.4.11.4.1.2 Data files structure ........................................................................................................................ 134
3.4.11.4.1.3 Report files structure ..................................................................................................................... 134
3.4.11.4.2 Standard FTP CCSDS mode ............................................................................................................ 135
3.4.11.4.3 FTP user defined mode .................................................................................................................... 137
3.4.12 Playback function ................................................................................................................................... 138
© Safran Data Systems - IMP000074 e14r1
HIGH DATA RATE RECEIVER
HDR-4G+ USER'S MANUAL
...................................................................................................................................... 123
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Is.Rev
Date:
Safran Data Systems
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DTU 100782
3.5
June 1, 2021
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