Yo Bob! On Sat, 7 Jan 2017 16:16:44 -0500 Bob Camp <[email protected]> wrote:
> In terms of multipath at GPS frequencies, a couple of inches is a
> *lot*. Also unless you have pretty good antennas (as in much larger
> than 1” each) they will have phase issues unique to each antenna.
> Phase cancellation and addition is what gives you multipath.
I see up to 10x better/worse between GPS brands. Measured by CEP(). A
much smaller change between antenna models. I also have interchanged
antennas between my GPS to rule them out as the major contributing
source to error and discard the worst ones.
I just started 24 hour plots of 4 adjacent GPS. I guess tomorrow I'll
rotate the antennas between GPS, witout moving the antennas, and repeat.
I suspect we may be just seeing different aspects of the same thing. A
big difference between GPS models is probably the quality of multipath
rejection. And I can easily change my GPS, but chaning my geoplogy is a
lot harder.
RGDS
GARY
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Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
[email protected] Tel:+1 541 382 8588
Veritas liberabit vos. -- Quid est veritas?
"If you can’t measure it, you can’t improve it." - Lord Kelvin
pgpYyS_YvRTlC.pgp
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