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Re: [gpsd-dev] RFC: GPSd on Android as a system service

From: Gary E. Miller
Subject: Re: [gpsd-dev] RFC: GPSd on Android as a system service
Date: Mon, 6 May 2019 15:35:39 -0700

Yo Adam!

On Mon, 06 May 2019 18:29:48 -0400
Adam Serbinski <address@hidden> wrote:

> >> >> When we have an elevation of -91, and an ss > 0, it means that
> >> >> we are actually seeing a signal from that SV, but haven't YET  
> >received  
> >> >> almanac or ephemeris for it.    
> >> >
> >> >No.  Absolutely nothing in the u-blox doc to support that.  Many
> >> >have looked for it many times.    
> >> 
> >> Do you mean aside from page 285 of the ublox 8 doc in the
> >> UBX-NAV-SAT description where it says specifically "Elevation
> >> (range: +/-90), unknown if out of range"?  
> >
> >No.  A single negative stataement on -91 is not enough for me.  And
> >there are multiple ways the u-blox 8 (the only GPS that does this)
> >can report elevation and azimuth.  They all say similar.  
> The unknown is part of the field and applies specifically to that
> field, not to the rest of the packet.


> If you don't believe me, you can always check the flags in the same
> packet. The qualityInd bits will tell you very specifically if there
> is an actual signal independent of using, you know, the actual signal
> strength.

Yes, it matches.  Not useful.

None of that tells us what -91 means.  No point passing on meaningless

> >The NMEA doc also says do not pass on invalid data.  
> Even if the data was invalid, this isnt NMEA.

True, but once again, gpsd is trying to bring consistency, not chaos.

> >BTW, this is better handled on gpsd-dev, where it has been discussed
> >before.  
> Apologies, my email client likes to reply to you.

"A poor workman that blames his tools."

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

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