Re: [gpsd-dev] Note on climb error modelling

[Eric S. Raymond]

Pavel Kirienko <address@hidden>:
> Seems that usually gpsd's error modelling logic yields too high EPC
> values if compared to the typical GPS speed precision; especially in
> cases when the solution update frequency is higher than 1 Hz (for
> reference, EPC is currently being computed as (old_epv + new_epv) /
> dt).
> 
> I can't propose a better approach for error modelling now, but we can
> reuse EPS for EPC. I.e. if a receiver provides EPS and not EPC,
> assumption EPS = EPC seems to be justifiable.

Before I change yjthe error modeling, break all our regression tests,
and break backwards compatibility, I will need to see a *principled reason*
for the change - not just an ad-hoc patch.

That is, you need to argue that the new formula is physically and
geometrically reasonable.
-- 
                <a href="http://www.catb.org/~esr/";>Eric S. Raymond</a>