Safran CORTEX CRT Quantum - Page 220

COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
Ref. DTU 100042
Is.Rev. 5.17
Date: Dec.
03, 2021Sept. 30, 2021
© Safran Data Systems
This document is the property of Safran Data Systems.
It cannot be duplicated or distributed without expressed written consent.
Page 140
Proper transmission of a TC message can be checked by means of two flags (named CMM1 and CMM2) in the
telemetry flow. CMM1 flag, when ON, indicates that the on-board RF receiver is locked onto the carrier and that
the TC preamble can be uplinked. CMM2 flag, when ON, indicates that the on-board bit synchronizer is locked
and that the TC message can be transmitted.
IF CARRIER ON ?
SEND PREAMBLE
TO THE TCU (1)
Y
N
TCU IDLING ?
Y
N
SEND TC MESSAGE
TO THE TCU (1)
SEND TC MESSAGE
TO THE TCU (1)
SEND « CARRIER ON »
COMMAND TO THE IFM
CMM 1 ALREADY TRUE ?
SWEEPING MODE
= AUTO or AUTO + RZ ?
SEND « SWEEPING ON »
COMMAND TO THE IFM
CMM 1 TRUE ?
SWEEPING MODE ?
SEND « RZ »
COMMAND TO THE IFM
SEND « SWEEPING OFF »
COMMAND TO THE IFM
1
SWEEPING MODE ?
SEND « RZ »
COMMAND TO THE IFM
SEND « SWEEPING OFF »
COMMAND TO THE IFM
WAIT FOR IF CARRIER
SET TIME EXPIRY
1
Y
AUTO + RZ
N
N
CMM 2 CHECK ON ?
N
CMM 2 TRUE ?
Y
Y
N
IF CARRIER SET TIME EXPIRED
(1) Idling restarts automatically upon preamble
or TC message transmission by TCU.
If preamble length = 0 the TC is transmitted
even if CMM2 is not true.
Y
N
MEMORIZE
IF CARRIER STATE
Carrier forced to ON
TC REQUEST
PROCESSING
Sweeping OFF or forced to ON
EXIT On-board receiver unlocked : DISCARD TC
EXIT
EXIT
EXIT
1
On-board bit sync. unlocked :
DISCARD TC
EXIT : the IF carrier is automatically set to the initial state
AUTO
AUTO + RZAUTO
ELSE
ELSE
N
CMM1 CHECK ON ?
Y
EXIT
Protocol anomaly
DISCARD TC
Y
CMM2 CHECK ON &
CMM2 ALREADY TRUE ?
EXIT
Protocol anomaly
DISCARD TC
Y
N
Figure 74: Satellite Telecommanding Protocol with CLCW Check & Carrier Sweeping