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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
1.1.1.1.1
LDPC Encoding ..................................................................................................................................................... 126
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.
3.5.1.
General ...................................................................................................................................................... 132
3.5.1.1.
Satellite TC Request ................................................................................................................................................ 133
"Wait & Verify" Instruction with Time-out and Retry ............................................................................................ 134
3.5.1.2.
"Execute" Instruction ............................................................................................................................................... 134
3.5.1.3.
"Pause" Instruction .................................................................................................................................................. 134
3.5.1.4.
"Wait for Absolute Time" Instruction ...................................................................................................................... 134
3.5.1.5.
"TCU Unlock" Instruction ....................................................................................................................................... 134
3.5.1.6.
"NOP" Instruction .................................................................................................................................................... 135
3.5.1.7.
"Stop Idling" Instruction .......................................................................................................................................... 135
3.5.1.8.
"Group" Instruction ................................................................................................................................................. 135
3.5.1.9.
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
"COP" Software Package ......................................................................................................................... 144
3.5.9.
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.
3.6.1.
General ...................................................................................................................................................... 148
3.6.1.1.
Supported Standards ................................................................................................................................................ 148
3.6.1.2.
Ranging ports ........................................................................................................................................................... 148
"Local" Ranging Client ............................................................................................................................................ 148
3.6.1.3.
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
© Safran Data Systems
COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
....................................................................................................................... 132
.................................................................................................................................... 148
This document is the property of
It cannot be duplicated or distributed without expressed written consent.
Safran Data Systems
.
Ref.
DTU 100042
Is.Rev.
5.17
Date:
Dec. 03, 2021Sept.
30, 2021
Page viii
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