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Re: GPS/PPM very large offset

From: Mike Simpson
Subject: Re: GPS/PPM very large offset
Date: Fri, 6 Nov 2020 23:51:38 +0000

Big. Sometimes 3s, sometimes 4s. B&A complaining of 5s. 

On my Pi when it was happening I noticed that the time offset field of cgps 
would jump about rapidly from 0.2s-0.4s to 3.something and ntpsec would state 
that both pps and gps were 3 seconds off. 

Removing GLONASS kept the cgps time offset at 0.something and corrected the 
time seen by ntpsec. 

Second time this has come up on the list with the ublox8. 

> On 6 Nov 2020, at 23:38, Greg Troxel <> wrote:
> Mike Simpson <> writes:
>> It’s glonass 
>> They run such a big offset that they are unusable for time. 
>> ubxtool -d GLONASS
>> Need to do this every time after Pi reboot or presumably cold restart of the 
>> GPS. 
> What do you mean by big?   Do you mean something like 41 ns?
> Or do you mean 5s?  If so, surely 5s is not an error, and there is some
> alternate time scale and there should be translations.

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