Safran CORTEX Series - Absolute Reference Time & Leap Second Management

HIGH DATA RATE RECEIVER
HDR-4G+ USER’S MANUAL
Ref. DTU 100782
Is.Rev 3.5
Date: June 1, 2021
© Safran Data Systems – IMP000074 e14r1
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Page 243
Absolute Reference Time & Leap Second Management 4.5.3.3.4
The following scenario is a combination of the two previous scenarios.
Example:
 The absolute time reference is January 1
st
, 1998 at 0 AM.
 The CORTEX is started on January 1
st
1999 at 0 AM with Current Offset = 0.
 The current leap second value is 10.
The procedure is as follows:
1. Enter: Date of Next Offset 1 = 3600
Next Offset 1 = 31 536 010 (one non leap year + 10 seconds)
2. On January 1
st
, 1999 at 1 AM, (3600 seconds after boot up) check that the Current Offset is set
to 31 536 010 and that the time-tags are updated accordingly. The day counter is now equal to
366.
3. In the course of 1999, enter:
Date of Next Offset 1 = 0 (January 1
st
2000)
Next Offset 1 = 63 072 010 (two non-leap years + 10 seconds)
Next Offset 2 = Date of Next Offset 2 = 0
4. On January 1
st
, 2000 at 0 AM, check that the Current Offset is set to 63 072 010 and that the
time-tags are updated accordingly. The day counter is now equal to 731.
5. Repeat step 3 every following year.