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.
3.6.3.2.1. ESA, ESA-like, Hybrid Ranging and USB Standards ........................................................................................ 154
3.6.3.2.2. ESA Code Standard ............................................................................................................................................ 156
3.6.3.3. Phase-shift Measurement ......................................................................................................................................... 157
3.6.3.4. Phase-shift Correction for Ambiguity Solving ......................................................................................................... 157
3.6.3.4.1. “Spectrum Correction” ....................................................................................................................................... 157
3.6.3.4.2. “Ground Correction” .......................................................................................................................................... 158
3.6.3.4.3. “Board Correction” ............................................................................................................................................. 158
3.6.3.5. Doppler Rate Aid and Doppler Aid ......................................................................................................................... 159
3.6.3.5.1. Doppler Effects .................................................................................................................................................. 159
3.6.3.5.2. Carrier Doppler Shift in Coherent Mode ............................................................................................................ 159
3.6.3.5.3. Carrier Doppler Shift in Non-Coherent Mode .................................................................................................... 160
3.6.3.5.4. Doppler Rate Aid Principle and Architecture ..................................................................................................... 161
3.6.3.5.5. Doppler Aid Principle and Architecture ............................................................................................................. 162
3.6.3.6. Range Measurements Sampling ............................................................................................................................... 164
3.6.4. Other programming Parameters ............................................................................................................... 165
3.6.4.1. Number of Measurements & Sequences .................................................................................................................. 165
3.6.4.2. Tone Validation and Tone Sequence (ESA-like and USB tone Standards) ............................................................. 165
3.6.4.3. Measurement Sampling............................................................................................................................................ 165
3.6.4.4. Integration Time ...................................................................................................................................................... 165
3.6.4.5. Tone Level Ratio ..................................................................................................................................................... 166
3.6.4.6. PLL Bandwidth ........................................................................................................................................................ 166
3.6.4.7. Sequence Timing & Ambiguity Solving .................................................................................................................. 167
3.6.4.7.1. ESA, ESA-like and USB Tone Standards .......................................................................................................... 167
3.6.4.7.2. ESA Code Standard ............................................................................................................................................ 168
3.6.5. Measurement Time-Tagging ...................................................................................................................... 169
3.6.6. Ranging Transaction Messages ................................................................................................................. 170
3.6.6.1. Range Measurement................................................................................................................................................. 170
3.6.6.2. Calibration Measurement ......................................................................................................................................... 170
3.6.6.3. Time and Doppler Measurement .............................................................................................................................. 171
3.6.7. Storage of Ranging Messages .................................................................................................................... 172
3.6.8. ESA Tone Standard .................................................................................................................................... 173
3.6.8.1. General ..................................................................................................................................................................... 173
3.6.8.2. Tone Frequencies ..................................................................................................................................................... 173
3.6.8.2.1. Virtual Tones ...................................................................................................................................................... 173
3.6.8.2.2. Real Tones .......................................................................................................................................................... 173
3.6.8.3. Ranging Sequence .................................................................................................................................................... 174
3.6.9. ESA-like and USB Tone Standards ............................................................................................................ 176
3.6.9.1. Frequency Programming .......................................................................................................................................... 176
3.6.9.2. Number of Tones and Transmission Rank ............................................................................................................... 177
3.6.9.3. Real and Virtual Minor Tone Frequency ................................................................................................................. 177
3.6.9.4. Ambiguity Distance ................................................................................................................................................. 177
3.6.9.4.1. Integer Ratio Between Q Factors ........................................................................................................................ 177
3.6.9.4.2. Non-Integer Ratio Between Q Factors ............................................................................................................... 178
3.6.10. INMARSAT / LMCO Tone Standards ........................................................................................................ 179
3.6.10.1. General ..................................................................................................................................................................... 179
3.6.10.2. Tone Frenquencies ................................................................................................................................................... 179
3.6.10.3. Minor Tone Sub-Carrier........................................................................................................................................... 179
3.6.10.4. Ranging Sequence .................................................................................................................................................... 179
3.6.11. ESA Code Standard ................................................................................................................................... 182
3.6.11.1. General ..................................................................................................................................................................... 182
3.6.11.2. Frequency Programming .......................................................................................................................................... 182
3.6.11.3. Code Programming .................................................................................................................................................. 182
3.6.11.4. Tone & Code Set Time ............................................................................................................................................ 183
3.6.11.5. Ranging Sequence .................................................................................................................................................... 183
3.6.12. PN Codes Standard (Regenerative PN Ranging) ...................................................................................... 185
3.6.12.1. General ..................................................................................................................................................................... 185
3.6.12.2. Frequency Programming .......................................................................................................................................... 185
3.6.12.3. Code Programming .................................................................................................................................................. 186
3.6.12.4. Shaping Filter ........................................................................................................................................................... 186
3.6.12.5. Tone & Code Set Time ............................................................................................................................................ 187
3.6.12.6. Ranging Sequence .................................................................................................................................................... 188
3.6.13. Hybrid Ranging Standard .......................................................................................................................... 190
3.6.13.1. General ..................................................................................................................................................................... 190
3.6.13.2. Tone Frequencies ..................................................................................................................................................... 190
3.6.13.3. Ambiguity ................................................................................................................................................................ 192
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