Users manual
Appendix A
Revision #:
A
Date:
07-14-15
Page
23
of
58
Notes:
△
4
-
LEGACY PPS setting is output legacy PPS which is not synchronized with frequency which is output
from GCLK pin, but which is output immediately after first fix in case of cold start.
-
GCLK PPS setting is output GCLK PPS which synchronized with frequency which is output from
GCLK pin, but it takes some to become GCLK PPS steady after first fix (typically, 1~2 minutes after
fist fix). User can confirmed whether GCLK PPS is steady by GCLK accurate field of TPS4 sentence.
-
User can choose GPS, UTC (USNO) and UTC (SU) as alignment of PPS by TIMEALIGN command.
The default is UTC (USNO). As for details, please refer to the page of TIMEALIGN command.
-
The condition of PPS synchronization is the follow.
[1] GPS alignment
[2] UTC (USNO) alignment (default)
PPS
mode
Before first fix
After first fix
After taking UTC (USNO)
parameter from GPS
0
OFF
OFF
OFF
1
Sync with RTC Sync with GPS
Sync with UTC (USNO)
2~4
OFF
Sync with GPS
Sync with UTC (USNO)
[3] UTC (SU) alignment
PPS
mode
Before first fix
After first fix
After taking UTC (SU)
parameter from GLONASS
0
OFF
OFF
OFF
1
Sync with RTC Sync with GPS
Sync with UTC (SU)
2~4
OFF
Sync with GPS
Sync with UTC (SU)
- About PPS estimated accuracy, please refer to the page of CRX (TPS2) sentence.
PPS
mode
Before first fix
After first fix
0
OFF
OFF
1
Sync with RTC Sync with GPS
2~4
OFF
Sync with GPS
