Hi, I have a problem (Houston..). :-) I must connect a Navman Jupiter 21 receiver to a linux-embedded machine. I must also use PPS signal for accurate time to syncronize the internal machine clock. After a lot of various tests i have big trouble upon the utilization of ntp. i have used:
1 gpsd (version: 2.32, 2.35beta) with ntpd (version: 4.1.1, 4.2.4, 4.2.5_24) (ntp.conf using shared memory 127.127.28.0/1) 2 only ntp (ntp.conf with NMEA/PPS 127.127.20.0/127.127.22.0) 3 a old Navman Jupiter 12 receiver (with Refclock Jupiter 127.127.31.0) In the test 1, the ntpq -p show a offset upon SHM1-0 that without warning jump to +/- 300/400 msec (ntpd sometimes show the "no new value found" in shared memory) In the test 2 i lost the PPS signal In the test 3 i have a relevant excursion of peerstat offset (4 msec..) In all test i have make various variations that i don't report to you.. this is only for example. My question is: what i must to do with all this "instruments" to have a stable time source for my machine? How i can use this strange PPS? How i can make to obtain a syncronization time-source from this reicever (or from a receiver)? Help me! -- David Anullo Itaco S.r.l. Via Zoe Fontana, 220 Ed. B1 00131 ROMA - ITALY Tel. +390641294922 - Fax +39064191740 www.itacosystems.com _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
