Re: [gpsd-users] Missing fixes

[Deven Hickingbotham]

Gary,

I'll send the raw data directly to you.  10hz and 4hz.

I tested at 4hz and there were no missing fixes.

Maybe I could further optimize the message stream from the GPS?

If I just needed time, lon/lat, speed & track, could I just enable the 
RMC sentence and turn everything else off?

If I wanted to add altitude, looks like I would have to add the GGA 
sentence.

And in order to get epx and epy, would I have to add both GSA & GSV?

Deven


On 2/19/2018 8:36 PM, Gary E. Miller wrote:
> Yo Deven!
>
> Please reply to the list, not me directly.
>
> On Mon, 19 Feb 2018 19:36:44 -0800
> Deven Hickingbotham <address@hidden> wrote:
>
> > It is a NEO-7P.  Baud is 115200.  Interface is UART.
>
> I've been working on a Javad using binary GREIS.  I can barely manage
> 4Hz at 115200.
>
> Have you tried capturing the raw data to see if it is all there?
> If you can send a copy to this list I can check it for you.
>
> > Yes, a lot of data.  With that in mind, I configured the NEO-7P to
> > deliver only the necessary data:
> >
> > GGA 1
> > GLL 0
> > GSA 5
> > GSV 5
> > RMC 1
> > VTG 1
>
> Those GSV can get really big.
>
> > So GGA, RMC and VTG are delivered every cycle.  GSA and GSV every
> > fifth cycle.  GLL is off.
>
> OK.
>
> > What I've tried to do is turn off everything that is not necessary.
> > What I need are lon, lat, speed, track, epx and epy every cycle.  I
> > could live with altitude updated every second.
>
> OK.
>
> > As a result, the only packets being transmitted are GGA, GSA, GSV,
> > RMC and VTG.
>
> No, you just said the others are in there too, just not at 10Hz.
>
> > Is there anything else I could turn off or optimize?
>
> Yeah, turn off 10Hz and go to 4Hz, if only for a test.  gpsd
> does not handle input buffer overflows well...
>
> RGDS
> GARY
> ---------------------------------------------------------------------------
> Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
>         address@hidden  Tel:+1 541 382 8588
>
>             Veritas liberabit vos. -- Quid est veritas?
>      "If you can???t measure it, you can???t improve it." - Lord Kelvin