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.
3.7.5. Time Management
Two cases are demonstated, the first one concerns the leap year (cf Figure 47), the second is about the extra
few seconds added each year to compensate the IRIG-B Clock (cf Figure 77 : Leap year). In the two cases, we
have a slipping of execution dates equivalent to 3600x24 seconds for leap year or the value of IRIG-B
compensation. To avoid this situation, the MCS gives possibilities to the user to inform the SPS about leap years
and time offsets. Refer to the MCS User’s Manual.
Note: the maximum time between sending the Doppler compensation request and the execution date is 170
days.
TIME
TIME COUNTING
31622400 seconds = 1 leap year
IRIG
-
B
31536000 seconds = 1 year
EXEC DATE
Figure 88: Leap year
31536001 seconds
TIME
TIME COUNTING
IRIG
-
B
31536000 seconds = 1 year
EXEC DATE
Figure 89: IRIG-B compensation
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