Safran CORTEX CRT Quantum - Page 243

COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
Ref. DTU 100042
Is.Rev. 5.17
Date: Dec.
03, 2021Sept. 30, 2021
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Page 163
Ambiguity resolution module :
Minor tones processing
f
tx_tone
IF
Receiver
Ranging Major Tone tracking
S
rx
(t) X
RG_rx
(t)
Major tone
synthesizer

Rone
(t)
Low pass &
decim. filter
PLL
filter
VCO

residual
(t)
Rough delay estimation :
N = number of 2  -rotations on the Major tone
Phase
accumulator

Rone
(t)

Rone
(t) = 
Rone
(t)
mod2 
+ 2  N
Figure 78: Doppler Aid Architecture
To configure the Doppler Aid module, The Doppler Rate Aid / Doppler Aid parameter is set to “Doppler”, and the
Carrier Doppler shift / Tone Doppler shift is set appropriately depending upon the satellite operation (Coherent vs
Non Coherent).