Doppler Compensation; General; Concerned Units - Safran CORTEX CRT Quantum User Manual

3.7. Doppler Compensation

General

3.7.1.
The Doppler Compensation mechanism is used for real time adjustment of the uplink and downlink IF carrier
frequency, bit rate and chip rate. The Doppler compensation mechanism drastically improves signal acquisition
and tracking performances of the on-board and station IF Receivers.
The Doppler Predictions are initialised by a request containing a time reference (based on IRIG B reference), a
time offset and a frequency offset. This compensation will be applied by the Cortex when the time offset
(execution date) is reached.

Concerned Units

3.7.2.
The units concerned by Doppler Compensation Process are:
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Note : In case of diversity combining, it is recommended to send the same Doppler prediction table to both of the
IFRs.
© Safran Data Systems
COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
IFM, Carrier compensation
TCU, Sub-Carrier and/or Bit Rate compensation
TMS, Sub-Carrier and/or Bit Rate compensation
IFR, Carrier compensation
TMU, Sub-Carrier and/or Bit Rate compensation
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Safran Data Systems
.
Ref. DTU 100042
Is.Rev. 5.17
Date: Dec.
03, 2021Sept. 30, 2021
Page 201