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.
3.7. Doppler Compensation
3.7.1. General
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.
3.7.2. Concerned Units
The units concerned by Doppler Compensation Process are:
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
Note : In case of diversity combining, it is recommended to send the same Doppler prediction table to both of the
IFRs.
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