10
DCF77 Emulation
The GPS167 satellite controlled clock generates TTL level time marks (active HIGH)
which are compatible with the time marks distributed by the German long wave radio
transmitter DCF77. This time broadcast station installed in Mainflingen near Frankfurt/
Germany transmits the reference time of the Federal Republic of Germany: time of day,
date of month and day of week in BCD coded second pulses. The complete time
information is transmitted once every minute. Please note that the GPS167SV generates
time marks representing its local time as configured by the user, including announcement
of changes in daylight saving and announcement of leap seconds. The coding scheme is
given below:
M
Start of Minute (0.1 s)
R
RF Transmission via secondary antenna
A1
Announcement of a change in daylight saving
Z1, Z2
Time zone identification
Z1, Z2 = 0, 1:
Daylight saving disabled
Z1, Z2 = 1, 0:
Daylight saving enabled
A2
Announcement of a leap second
S
Start of time code information
P1, P2, P3
Even parity bits
0
10
20
30
40
50
R
M
1
4
2
1
20
10
8
4
2
1
P
2
2
0
1
0
8
4
2
1
2
4
8
10
1
2
4
8
10
2
0
4
0
8
0
P
3
A1
Z1
Z2
A2
S
1
2
4
8
1
0
2
0
4
0
P
1
Minute
(reserved)
Hour
Day of Month
Day of Week
Year of the Century
Month of Year
Time marks start at the beginning of a new second. If a binary "0" is to be transmitted, the
length of the corresponding time mark is 100 msec, if a binary "1" is transmitted, the time
mark has a length of 200 msec. The information on the current date and time as well as
some parity and status bits can be decoded from the time marks of the 15th up to the 58th
second every minute. The absence of any time mark at the 59th second of a minute
signals that a new minute will begin with the next time mark. The DCF emulation output
is enabled immediately after power-up.
Содержание GPS167SV
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Страница 32: ...32 IRIG Standard Format x 3x TYPICAL MODULATED CARRIER IRIG A 10000 Hz IRIB B 1000 Hz binary 0 binary 1 ...
Страница 33: ...33 AFNOR Standard Format ...
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Страница 43: ...43 Diskette with Windows Software GPSMON32 ...
Страница 44: ...GP S 1 6 7 S V E 0 5 0 5 0 6 ...