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Re: [gpsd-users] Garmin 18X-5Hz

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.



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