[time-nuts] GPS antenna in snowy environment

Magnus Danielson magnus at rubidium.dyndns.org
Thu Aug 28 14:59:28 EDT 2014


Attila,

On 08/28/2014 08:15 PM, Attila Kinali wrote:
> On Thu, 28 Aug 2014 12:00:19 -0400
> Dan Kemppainen <dan at irtelemetrics.com> wrote:
>
>> However, that raises a good questions, in terms of cones and shedding
>> snow. I wonder how a straight slender vertical pipe with capped end
>> would work. Say 6 feet long. Let the snow build on the top. You might
>> loose a few degrees of sky view above it, but how detrimental would that
>> be?
>
> Unless you live directly under the path of one of the orbits, satellites
> will not pass directly above you, so there would be little los.
>
> But the pipe is not such a good idea. All signals from high elevation
> angle will have a long path trough the pipe, changing their phase
> ever so slightly. How much, depends on the pipe, it's thiknes and material.
> Whether it actually matters or not, depends on your requirements.

You naturally use calibration files for your antenna to compensate for 
pseduo-range errors due to azimuth and elevation if you care to that level.

It's just one of several corrections you do if you care about precision.

Cheers,
Magnus



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