uBlox M8T & antenna behind two panes of glass
skyview is a 170 degree sweep centred 30 degrees east of south
I regularly see attenuation with overcast clouds, but only with some
overcast clouds. It's not consistent enough to be able to say which types.
The attenuation can be as much as 10 dBc,
As far as I know, my friend's GPS dropout problems have been associated with
simple clouds with no rain (at least no rain reaching the surface).
Dana
On Wed, Oct 23, 2019 at 2:00 PM Tim Shoppa wrote:
> I don't think clouds is the direct cause, but of course clouds in the sky
> can be
I don't think clouds is the direct cause, but of course clouds in the sky
can be correlated with wet foliage.
Especially if the GPS Field Of View has a lot of angle taken up by tree
canopy, wet foliage can substantially degrade not just GPS reception but
other VHF and UHF signals.
I notice this
Andy,
Isn't DirecTV downlinking around 12 GHz? Yet GPS L1 is at only ~1575
MHz. That's
a huge difference with regard to scattering losses, and probably a fair
amount of
difference for water absorption losses as well.
I've recommended that my old friend try putting his GPS antenna up in the
Having had DirecTV on the roof for a few years, and having experienced
regular significant signal loss events during heavy rain and snow (loss of
reception was a rather good predictor that "the skies were about to open
up" with rain), I can confirm that signal strength deteriorates noticeably
Hi jimlux -- unfortunately my domain expertise is in the digital
domain (computer science) and I'm having a hard time in following this
paper. I do understand that "space weather", i.e. CMEs (coronal mass
ejections) will significantly impact GPS/GLONASS operations when the
charged particles reach
On 10/22/19 1:13 AM, Poul-Henning Kamp wrote:
In message
, Fiorenzo
Cattaneo writes:
Any kind of atmospheric disturbance has a measurable effect on GPS
space and time precision, [...]
Actually, it's even simpler than that:
Any electrical charge in the freshnell-zone between the
On 10/22/19 2:23 AM, Jim Palfreyman wrote:
I see no attenuation at 1376 MHz (close to GPS frequency) when observing
pulsars with a radio telescope. Even the brightest pulsar (Vela) is so much
fainter than a GPS signal which boom in when they happen to pass into the
telescope's beam.
It
On 10/21/19 10:06 PM, Dana Whitlow wrote:
A friend of mine living in SE lower Michigan recently bought
a Geppetto GPS clock, and swears that it tends to lose
satellite lock on cloudy days but does OK on sunny days.
He is admittedly using a very poorly-sited antenna,
placed in a window because
In message
, Fiorenzo
Cattaneo writes:
>Any kind of atmospheric disturbance has a measurable effect on GPS
>space and time precision, [...]
Actually, it's even simpler than that:
Any electrical charge in the freshnell-zone between the two antennas
delays the signal.
In practice that
I see no attenuation at 1376 MHz (close to GPS frequency) when observing
pulsars with a radio telescope. Even the brightest pulsar (Vela) is so much
fainter than a GPS signal which boom in when they happen to pass into the
telescope's beam.
It definitely happens at higher frequencies though. Up
Any kind of atmospheric disturbance has a measurable effect on GPS
space and time precision, the question is more about how much the
impact is. Presuming that the GPS receiver is stationary, the antenna
has a clear visibility of the sky, then "ordinary weather" like
clouds, moderate rain or snow,
A friend of mine living in SE lower Michigan recently bought
a Geppetto GPS clock, and swears that it tends to lose
satellite lock on cloudy days but does OK on sunny days.
He is admittedly using a very poorly-sited antenna,
placed in a window because his house has aluminum
siding. He reports
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