Safran CORTEX Series - Figure 91: 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
This document is the property of Safran Data Systems.
It cannot be duplicated or distributed without expressed written consent.
Page 241
The procedure is as follows (see next figure):
1. Start the CORTEX and go to the « Time » window.
2. Program the following values:
Current Offset = 10
Date of Next Offset 1 = Date of Next Offset 2 = 15 638 400
Next Offset 1 = 11
3. On July 1
st
, 00 h, 00 mn, 00 s, check that the Current Offset is automatically set to 11 and
that the time-tags are updated accordingly. Note: 15 638 400 = July 1
st
, 00 h, 00 mn, 00 s =
181 days x 86400.
4. Before December 31
st
, program the following values:
Date of Next Offset 1 = 31 535 989
Next Offset 1 = - 31 535 989
Date of Next Offset 1 = 0
Next Offset 1 = 11
Figure 91: Leap Second Management
Decoded time code
Corrected time (data time-tags + display)
Leap second entry (N seconds)
N seconds before end of year, force corrected time to 0 for starting new year (Offset = - X seconds)
At the beginning of next year, force current offset to N seconds
TIME
TIME COUNTING
0
15 638 400 seconds = 1 year)
(if non leap year)
X
N
N
Current offset = 0