8
Time Zone and Daylight Saving Time
GPS system time differs from the universal time scale (UTC) by the number of leap
seconds which have been inserted into the UTC time scale after GPS has been initiated in
1980. The current number of leap seconds is part of the navigation message supplied by
the satellites, so GPS167SV´s internal real time is based on UTC. Conversion to local
time including handling of daylight saving time for each year can be performed by the
receiver´s microprocessor if the corresponding parameters are correctly set by using the
GPSMON32 application.
Pulse Outputs
The pulse generator of GPS167SV generates pulses once per second (P_SEC) and once
per minute (P_MIN). Additionally, master frequencies of 10 MHz, 1 MHz and 100 kHz
are derived from the oscillator. All the pulses are available with TTL level at the rear
connector.
Frequency Outputs
(optional)
The optional synthesizer generates a frequency from 1/8 Hz up to 10 MHz synchronous
to the internal timing frame. The phase of this output can be shifted from -360° to +360°
for frequencies less than 10 kHz. Both frequency and phase can be configured with the
GPSMON32 application via serial port COM0. Synthesizer output is available at the rear
connector as sine-wave output (F_SYNTH_SIN), with TTL level (F_SYNTH) and via
an open drain output (F_SYNTH_OD). The open drain output can be used to drive an
optocoupler when a low frequency is generated.
In the default mode of operation, pulse outputs and the synthesizer output are disabled
until the receiver has synchronized after power-up. However, the system can be configu-
red to enable those outputs immediately after power-up. An additional TTL output
(TIME_SYN) reflects the state of synchronization. This output switches to TTL HIGH
level when synchronization has been achieved and returns to TTL LOW level if no
satellite can be received or the receiver is manually forced to another mode of operation
by the user.
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 ...
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Страница 43: ...43 Diskette with Windows Software GPSMON32 ...
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