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.
3.3.6.4. Reed-Solomon Decoding ........................................................................................................................................... 69
3.3.6.5. Turbo Decoding ......................................................................................................................................................... 70
3.3.6.6. Probability of Bit Error .............................................................................................................................................. 72
3.3.6.6.1. PCM/BPSK/PM (Low or High Bandwidth) ......................................................................................................... 72
3.3.6.6.2. PCM/BPSK Square/PM (Low or High Bandwidth) ............................................................................................. 73
3.3.6.6.3. High Bandwidth Direct PCM (PCM/PM) ............................................................................................................ 73
3.3.6.6.4. High Bandwidth Direct PCM (BPSK) .................................................................................................................. 73
3.3.6.7. LDPC Decoding ......................................................................................................................................................... 73
3.3.7. Ambiguities Solving, I/O Ports & By-passing Capabilities ......................................................................... 76
3.3.7.1. Low Bandwidth TMU ................................................................................................................................................ 76
3.3.7.2. High Bandwidth TMU with Sub-carrier .................................................................................................................... 77
3.3.7.3. High Bandwidth Direct PCM: no Viterbi Decoding .................................................................................................. 79
3.3.7.4. High Bandwidth PCM: Single Viterbi Decoding ....................................................................................................... 82
3.3.7.5. High Bandwidth Direct PCM: Dual Dcoding ............................................................................................................ 84
3.3.7.6. High Bandwidth Direct PCM: DQPSK or DOQPSK ................................................................................................. 87
3.3.7.7. High Bandwidth PCM: Dual + Differential decoding ................................................................................................ 90
3.3.7.8. High Bandwidth Direct PCM: AQPSK ...................................................................................................................... 93
3.3.8. Frame Synchronization ................................................................................................................................ 95
3.3.8.1. Frame Synchronization Strategy ................................................................................................................................ 95
3.3.8.2. PSK Ambiguity Solving ............................................................................................................................................ 96
3.3.8.3. Frame Synchronizer Operating Modes....................................................................................................................... 97
3.3.8.4. AFL: Anti False Lock ................................................................................................................................................ 97
3.3.9. Frame Verification....................................................................................................................................... 98
3.3.10. Telemetry Frames or Raw Data ................................................................................................................... 98
3.3.11. Telemetry Data Time-Tagging ..................................................................................................................... 98
3.3.12. Real-Time of Off-line Telemetry Server ....................................................................................................... 99
3.3.12.1. Telemetry Request ..................................................................................................................................................... 99
3.3.12.2. Telemetry Buffers ...................................................................................................................................................... 99
3.3.12.3. Telemetry Data Flows .............................................................................................................................................. 100
3.3.12.3.1. Single Frame / Block Transmission .................................................................................................................... 100
3.3.12.3.2. Permanent Flow .................................................................................................................................................. 100
3.3.12.3.3. Permanent Flow and Dummy TM ...................................................................................................................... 100
3.3.13. Telemetry Data Decommutation ................................................................................................................ 100
3.3.14. Telemetry Data Storage on the Disk .......................................................................................................... 101
3.3.15. Blind Equalization ..................................................................................................................................... 103
3.3.15.1. General ..................................................................................................................................................................... 103
3.3.15.2. DEAF ....................................................................................................................................................................... 104
3.3.15.2.1. Configuration of the DEAF Algorithm ............................................................................................................... 106
3.3.16. Descrambling mode (LFSR polynomials) .................................................................................................. 107
3.3.16.1. General ..................................................................................................................................................................... 107
3.3.16.2. CCSDS Descrambling ............................................................................................................................................. 107
3.3.16.3. Configuration of the Descrambling .......................................................................................................................... 107
3.3.16.4. Continuous Descrambling ........................................................................................................................................ 108
3.3.17. UTOA (Time Of Arrival precise measurements) ........................................................................................ 109
3.3.17.1. Prerequisites ............................................................................................................................................................. 109
3.3.17.2. Supported PCM Codes and Channel Encoding ........................................................................................................ 109
3.3.17.3. Registry Configuration ............................................................................................................................................. 110
3.3.17.4. TCP/IP Interface ...................................................................................................................................................... 110
3.4. IF MODULATION & TELEMETRY SIMULATION ................................................................................................ 111
3.4.1. Uplink Resources ....................................................................................................................................... 111
3.4.1.1. Low Bandwidth Scenario ......................................................................................................................................... 112
3.4.1.2. High Bandwidth Scenario ........................................................................................................................................ 113
3.4.1.2.1. PM and FM Modulation ..................................................................................................................................... 113
3.4.1.2.1.1. Single PCM Input Signal .................................................................................................................. 113
3.4.1.2.1.2. Video + PCM Input Signals ............................................................................................................. 114
3.4.1.2.2. BPSK Modulation .............................................................................................................................................. 115
3.4.1.2.3. QPSK and OQPSK Modulation ......................................................................................................................... 116
3.4.1.2.3.1. Without Convolutional Encoding .................................................................................................... 116
3.4.1.2.3.2. With Single Convolutional Encoding .............................................................................................. 117
3.4.1.2.3.3. With Dual Convolutional Encoding ................................................................................................ 117
3.4.1.2.3.4. With Differential Encoding .............................................................................................................. 117
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