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.
3.4.1.2.3.5. With Dual Convolutional and Differential Encoding .................................................................... 118
3.4.1.2.4. AQPSK Modulation ........................................................................................................................................... 119
3.4.2. Noise Generator Option ............................................................................................................................ 120
3.4.2.1. IFM Output Stage Architecture ................................................................................................................................ 120
3.4.2.2. C/No Adjust ............................................................................................................................................................. 120
3.4.2.3. Noise Bandwidth ...................................................................................................................................................... 120
3.4.3. Telemetry Simulation ................................................................................................................................. 121
3.4.3.1. General ..................................................................................................................................................................... 121
3.4.3.2. Operating modes ...................................................................................................................................................... 121
3.4.3.3. Encoding .................................................................................................................................................................. 123
3.4.3.3.1. Convolutional Encoding ..................................................................................................................................... 123
3.4.3.3.2. Tcm .................................................................................................................................................................... 123
3.4.3.3.3. Reed-Solomon .................................................................................................................................................... 123
3.4.3.3.4. Turbo-Code ........................................................................................................................................................ 124
LDPC Encoding ..................................................................................................................................................... 126 1.1.1.1.1
3.4.4. Uplink Digital Filter .................................................................................................................................. 128
3.4.4.1. General ..................................................................................................................................................................... 128
3.4.4.2. Filter Characteristics ................................................................................................................................................ 128
3.4.5. Sweeping .................................................................................................................................................... 131
3.5. SATELLITE TELECOMMANDING ....................................................................................................................... 132
3.5.1. General ...................................................................................................................................................... 132
3.5.1.1. Satellite TC Request ................................................................................................................................................ 133
3.5.1.2. “Wait & Verify” Instruction with Time-out and Retry ............................................................................................ 134
3.5.1.3. “Execute” Instruction ............................................................................................................................................... 134
3.5.1.4. “Pause” Instruction .................................................................................................................................................. 134
3.5.1.5. “Wait for Absolute Time” Instruction ...................................................................................................................... 134
3.5.1.6. “TCU Unlock” Instruction ....................................................................................................................................... 134
3.5.1.7. “NOP” Instruction .................................................................................................................................................... 135
3.5.1.8. “Stop Idling” Instruction .......................................................................................................................................... 135
3.5.1.9. “Group” Instruction ................................................................................................................................................. 135
3.5.1.10. “Data + Execute” Instruction ................................................................................................................................... 135
3.5.2. Satellite TC Requests and Instructions Sequencing ................................................................................... 135
3.5.3. CLCW Checking & IF Carrier Sweeping .................................................................................................. 137
3.5.4. TC Demodulation by a Telemetry Chain ................................................................................................... 142
3.5.5. Local Satellite Telecommanding Capabilities ........................................................................................... 143
3.5.6. Telecommand Socket Closure .................................................................................................................... 143
3.5.7. TC Watchdog ............................................................................................................................................. 143
3.5.7.1. Activation/Inhibition of the TC Watchdog Mechanism ........................................................................................... 143
3.5.7.2. TC Watchdog Mechanism ....................................................................................................................................... 143
3.5.8. Telecommand Unit Testing ........................................................................................................................ 144
3.5.9. “COP” Software Package ......................................................................................................................... 144
3.5.10. Carrier and Modulation Sequencing ......................................................................................................... 145
3.5.10.1. Carrier OFF, no Idle pattern ..................................................................................................................................... 145
3.5.10.2. Carrier ON, no Idle pattern ...................................................................................................................................... 145
3.5.10.3. Carrier OFF and Idle pattern .................................................................................................................................... 146
3.5.10.4. Carrier ON and Idle pattern ..................................................................................................................................... 146
3.5.11. Progressive modulation index ................................................................................................................... 147
3.6. RANGE MEASUREMENT .................................................................................................................................... 148
3.6.1. General ...................................................................................................................................................... 148
3.6.1.1. Supported Standards ................................................................................................................................................ 148
3.6.1.2. Ranging ports ........................................................................................................................................................... 148
3.6.1.3. “Local” Ranging Client ............................................................................................................................................ 148
3.6.1.4. Continuous Mode (All modes except INMARSAT and LMCO) ............................................................................. 149
3.6.1.5. Ranging Sequence (All modes except INMARSAT and LMCO) ............................................................................ 150
3.6.2. Frequency Programming ........................................................................................................................... 151
3.6.2.1. Major Tone Frequency ............................................................................................................................................. 152
3.6.2.2. Minor Tone Frequencies (ESA-like and USB Tone Standards) ............................................................................... 152
3.6.3. Downlink Tones Processing....................................................................................................................... 153
3.6.3.1. Tone Acquisition ...................................................................................................................................................... 153
3.6.3.1.1. Phase-Locked Loop ............................................................................................................................................ 153
3.6.3.1.2. Doppler Compensation (ESA, ESA-like, Hybrid Ranging and USB Standards) ................................................ 153
3.6.3.2. Ambiguity Solving & Quality Factor ....................................................................................................................... 154
To Next Page
Loading...