X
X
L
L
D
D
C
C
M
M
A
A
N
N
.
.
d
d
o
o
c
c
8
8
-
-
2
2
R
R
E
E
V
V
E
E
8-3 EMBEDDED WORST-CASE TIME ERROR FLAGS
Five flags are encoded in the control function segment of the IRIG B code. The first flag encoded at
element P5+40ms is the LOCK indicator. It is a binary 1 when the unit has lost contact with satellite
signals. The second flag encoded at element P5+60ms is a binary 1 when the worst-case time error
exceeds threshold 1 as described in SECTION III, "SERIAL I/O FUNCTION 05 -TIME QUALITY
ENABLE/SETUP". Element P5+70ms is a binary 1 when the worst-case time error exceeds
threshold 2. Element P5+80ms encodes a binary 1 when the error exceeds threshold 3 and P5+90ms
when the error exceeds threshold 4.
8-4 through 8-9 reserved
8-10 SPECIAL IRIG B TIME CODE FORMAT (EMBEDDED GPS DATA OPTION)
GPS data may be encoded in the control function segment of the IRIG B code. This data, along with
the worst-case time error flags (STANDARD), are present in the IRIG B code if this special option is
ordered. This special IRIG B format is used as a timing source for TrueTime’s Model MAC-SG
(560-5700).
Embedded GPS data is encoded between P6 and P0. One of five data items is encoded into each
second, determined by the units of seconds as follows:
UNITS OF SECONDS GPS DATA
0, 5
Latitude
1, 6
Longitude
2, 7
Altitude
3, 8
Year
4, 9
(spare)
Содержание 151-600
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