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From: | Robin Schwab |
Subject: | Re: [gpsd-users] Garmin 18X-5Hz |
Date: | Thu, 11 Aug 2016 22:12:21 +0200 |
User-agent: | Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 |
Am 11.08.2016 um 16:07 schrieb Miroslav Lichvar:
gpsd supports detection of 5 Hz PPS, but there is a problem that it always sets the fractional part of the timestamp to zero, so with 5 Hz PPS the offsets have an error of 0.0, 0.2, 0.4, 0.6 and 0.8 seconds.
I solved the problem for me by setting the NEMA update rate to something clearly below 0.5 s. In my amateur understanding it's then always clear to which NEMA sentence the pps pulse belongs: the one that is closer. Then you get a good fix although there remains a sawtooth-like offset variation.
Regards Robin
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