u-blox ANTARIS 4, Руководство по системной интеграции

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4.7 Timing
4.7.1 TIMEPULSE
ANTARIS
®
4 GPS receivers provide a hardware-synchronized TIMEPULSE (Pin 29) with a Time Pulse Period of
1 ms to 60 s. The polarity (rising or falling edge) and the pulse duration can be configured. Use the UBX
proprietary message UBX - CFG (Config) - TP (Time Pulse) to change the TIMEPULSE settings. The
UBX - TIM (Time) - TP (Timepulse) message provides the time information for the next TIMEPULSE, time source
and a quantization error.
Parameter Description
Pulse Mode
‘falling edge’
‘disabled’
TIMEPULSE synchronization on the falling edge
TIMEPULSE disabled (output signal low)
‘rising edge’
TIMEPULSE synchronization on the rising edge
Pulse Period e TIM Period of th EPULSE
Pulse Length the Duration of TIMEPULSE
Pulse Frequency The pulse frequency is calculated from the pulse period (u-center output only)
Time Source
Selection whether the Time Pulse is GPS time or UTC time synchronized
Cable Delay the iver Signal delay in cable from the antenna to the ANTARIS 4 GPS Rece
®
User Delay
The cable delay from ignal delay of
any user application
ANTARIS
®
4 GPS Receiver to the user device plus s
RF Group Delay Delay of the signal in the ANTARIS
®
4 GPS Receiver RF module (hard coded)
Table 40: TIMEPULSE Parameter description
Pulse Mode: Rising
TIMEPULSE
TIMEPULSE
Pulse Mode: Falling
time top of second top of second
Pulse Period
Pulse Length
Figure 85: Example of a 1PPS Signal designed with TIMEPULSE
As a pulse reference GPS or UTC time can be selected. This makes a difference if the Pulse Period exceeds 1s. As
the TIMEPULSE is synchronized with GPS- or UTC-time the Pulse Period must fulfill the following condition:
n must be an integer value!
Note The Maximum Pulse Length can’t exceed the Pulse Period minus 1ms.
s d PulsePerio n 60
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GPS Modules - System Integration Manual (SIM) (incl. Reference Design) Receiver Description
GPS.G4-MS4-05007-A1 Page 109