Time Management - Safran CORTEX CRT Quantum User Manual

Time Management

3.7.5.
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 COUNTING
31622400 seconds = 1 leap year
31536000 seconds = 1 year
TIME COUNTING
31536001 seconds
31536000 seconds = 1 year
© Safran Data Systems
COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
Figure 88: Leap year
Figure 89: IRIG-B compensation
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Safran Data Systems
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Ref. DTU 100042
Is.Rev. 5.17
Date: Dec.
03, 2021Sept. 30, 2021
TIME
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