Re: GPS satelllite view question

[Gary E. Miller]

Yo Nick!

On Wed, 23 Nov 2022 14:04:06 +0000
Nick Taylor <nicktaylor@dataskill.uk> wrote:

> We have a test lab where they have a row of GPS antenna mounted in 
> window - apparently single glazed.

Not ideal.  Various metals are used in glass to tint and/or polarize.

> They have been operating like this for years and haven't reported 
> problems to us before - although that's not to say that they didn't
> have problems and not tell anyone.

Yup, stuff just breaks;  Maybe a new RFI source, etc.

> My question is... I realise that in ideal world GPS should have as
> full view of sky as possible, but is it expected in the above
> scenario that there can be periods of time (hours to days) where the
> portion of sky visible by these GPS antenna in window can fail to see
> any satellite data

Ouch.

> That's what I suspect is happening there at the moment (multiple 
> independent units showing same symptoms):
> $GPGSA,A,1,,,,,,,,,,,,,,,*1E
> $GLGSA,A,1,,,,,,,,,,,,,,,*02

Not good, you have no fix.  You got nuttin'

Try adding a newer receiver, a 40mm ground plane, a new antenna, outside
mounting.

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        gem@rellim.com  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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