[time-nuts] GPS module recommendation for Pi timing

[Chris Burford]

A nice post processing application such as RTKLIB will show any cycle 
slips that your receiver might have encountered.

A good write up about cycle slips is available here:

https://rtklibexplorer.wordpress.com/2016/05/08/raw-data-collection-cycle-slips/ 
<https://rtklibexplorer.wordpress.com/2016/05/08/raw-data-collection-cycle-slips/>

Regards,

Chris

On 03/13/20 15:14:13, Hal Murray wrote:
> Thanks.
>
> kb8tq at n1k.org said:
>> One of the ways a GPS module “freaks out” is to slip by one code cycle
>> (which is just slightly over 1 ms). If you have a surveyed location, some
>> firmware will reject the solution and at least you will be in holdover.
> If it slips, how long does it stay slipped?
>
> I have plenty of old GPS units.  I'm a bit surprised I haven't noticed
> something like that.  Maybe I'm not looking hard enough and/or in the right
> place.
>
>> In a case where the *only* thing you can trust is the GPS, filtering isn’t
>> going to do much good.
> You also have the CPU crystal.  It's not good for long term stability, but
> shouldn't have any troubles holding to a ms over several seconds.
>
>
>
>
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