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.
4.2.7.4. IF Modulation
4.2.7.4.1. RZ Protocol
To modify the RZ flag (carrier sweeping function on the IF Modulator, Return to Zero protocol):
Registry path: HKEY_LOCAL_MACHINE\SOFTWARE\In-snec\CortexCRT\SetDefault\Preferences\Ifmx
(x = A or B)
Keyword: RzSweepMode
Default setting at delivery: 0 (standard RZ protocol)
Enter enter: 0 - standard RZ protocol
1 - RZ from a positive frequency slope only
2 - RZ from a negative frequency slope only
0x100 – Disable modulation during sweeping process
4.2.7.4.2. DQPSK, DOQPSK Code
Polynomial code for DQPSK encoding:
Registry path: HKEY_LOCAL_MACHINE\SOFTWARE\In-snec\CortexCRT\SetDefault\Preferences\Ifmx
(x = A or B)
Keyword: DQPSKcode
Default setting at delivery: 0xA3C5CA53
The 2 MSB byte are used to I polynomial value and 2 LSB byte are used to Q polynomial value.
Polynomial code for DOQPSK encoding:
Registry path: HKEY_LOCAL_MACHINE\SOFTWARE\In-snec\CortexCRT\SetDefault\Preferences\Ifmx
(x = A or B)
Keyword: DOQPSKcode
Default setting at delivery: 0x69693C3C
The 2 MSB byte are used to I polynomial value and 2 LSB byte are used to Q polynomial value.
4.2.7.4.3. IF Uplink Spectrum Inversion
To invert the IF output spectrum:
Registry path: HKEY_LOCAL_MACHINE\SOFTWARE\In-snec\CortexCRT\SetDefault\Preferences\Ifmx
(x = A or B)
Keyword: SpectInvert
Default setting at delivery: 0 (non-inverted spectrum)
Enter 0 (non-inverted spectrum) or 1 (inverted spectrum)
4.2.7.4.4. Swap G1 and G2 after Viterbi Encoding
To swap G1 and G2 after Viterbi encoder.
Registry path: HKEY_LOCAL_MACHINE\SOFTWARE\In-snec\CortexCRT\SetDefault\Preferences\Ifmx
(x = A or B)
Keyword: SwapG1G2
Default setting at delivery: 0 (G1 before G2)
Set the keyword to 1 to swap G1 and G2.
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