Re: release?

[Fred Wright]

On Mon, 2 Jan 2023, Greg Troxel wrote:
> Fred Wright <fw@fwright.net> writes:
>
> > The actual values of prRes are also "interesting".  Although the
> > quantity is nominally defined as signed, I don't see how a residual
> > can possibly be negative.  But many of the values reported by both
> > ubxtool and xgps are negative, with some strange scaling between the
> > two that also seems inconsistent with the definition (the doc says
> > 0.1m units).
>
> residual is
>
>  measurement - [expected measurement calculated from estimated parameters]
>
> so definitely it makes sense to be signed.

Ah, OK.  I thought it was the estimate of the error magnitude from the 
Kalman filter.  Maybe the residual covariance is what I was thinking of.

Fred Wright