[time-nuts] eBay GPS antennas
Gary E. Miller
gem at rellim.com
Fri Feb 16 14:49:53 EST 2018
Yo Bob!
On Fri, 16 Feb 2018 13:47:24 -0500
Bob kb8tq <kb8tq at n1k.org> wrote:
> Reports to date on Glonass have not been encouraging.
I have been testing position accuracy lately on a self contained u-blox
8 with built-in antenna supposedly GLONASS capable. I write a Python
script to selectively enable GLONASS and GALILEO over GPS.
All figures below are rough averages.
Typically, with one particular GPS, in one particular spot, it gives a
CEP(50) of 10 feet.
Enable GLONASS and that worsens to 24 feet. After about a minute the
u-blox rejects all the GLONASS, that have good SNR, and the CEP(50)
drops back to normal.
Enable GALILEO and CEP(50) improves to 6 feet. And stays that way.
So be sure to enable GALILEO in your GPS and disable GLONASS.
Also note: the passband of GALILEO is technically the same as GPS, but
has more energy at the edges. Some GPS antennas cut it a little close
and hurt GALILEO performance.
RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
gem at 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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