time-nuts@febo.com
Sent: Monday, May 25, 2015 6:01 PM
Subject: Re: [time-nuts] Terrestrial Tides and Land Movement
Hi
Let’s step back a bit:
Your module is accurate to maybe 2 ns over a short period of time and something
in the 10 to 20 ns range
over 24 hours. The 2 ns comes from a variety
time-nuts@febo.com
Sent: Monday, May 25, 2015 3:09 PM
Subject: Re: [time-nuts] Terrestrial Tides and Land Movement
Hi Bob,
You only need a survey if your timing receiver is running in zero-D mode. If
you move the antenna more than some practical threshold you should adjust the
fixed
Hi Bob S,
An HOA can be a daunting problem, but not one that cannot be
solved with a little guile.
Every house I have ever seen that has modern plumbing has a few
vent stacks on the roof. Would the HOA even notice if yours
sprouted another one dark weekend evening?
All the kit you need to add
Hi
If you believe the 3 ns / M applies in this case, tides will give you about
1 ns or so. If the geometry of the motion (vertical) and the orientation
of the sat’s is not same / same, the impact will be a bit less.
On an L1 system without some sort of ionosphere “help” and working just
off of
Hi
Add to that the fact that not everybody is moving at an inch per year. Around
here the magic number
is in the 1.5 to 2 mm per year range. It’s enough to be worth correcting survey
results vs benchmarks
every few years. It’s not enough to get into an L1 timing system any time soon
….
Bob
and Frequency Measurement time-nuts@febo.com
Sent: Monday, May 25, 2015 11:09 AM
Subject: Re: [time-nuts] Terrestrial Tides and Land Movement
Tom said: The nice thing about GPS, unlike other time transfer methods, is
that can handle the case of a moving antenna. As the antenna moves so does the
time
Attila,
Timing people account for everything that's important. A continental drift of
an inch per year acts like a slow phase change over time, which by definition,
is a frequency offset. So an inch per year is at most 1/12 * 1e-9 / (365*86400)
or 3e-18. For the current precision with which
get that. What's the purpose of doing a survey when you move your
antenna if this the case?
Bob
From: Tom Van Baak t...@leapsecond.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Monday, May 25, 2015 12:29 PM
Subject: Re: [time-nuts] Terrestrial
, 2015 1:53 PM
Subject: Re: [time-nuts] Terrestrial Tides and Land Movement
Hi
If you happen to *need* precise time on a moving platform, then GPS can
do that as well. There are a number of military systems that have this need.
There are also some things like mobile direction finding by TDOA
20:09 (GMT+01:00)
/divdivTill: Discussion of Precise Time and Frequency Measurement
time-nuts@febo.com /divdivRubrik: Re: [time-nuts] Terrestrial Tides and
Land Movement /divdiv
/divTom said: The nice thing about GPS, unlike other time transfer methods,
is that can handle the case of a moving
the purpose of doing a survey when you move your
antenna if this the case?
Bob
From: Tom Van Baak t...@leapsecond.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Monday, May 25, 2015 12:29 PM
Subject: Re: [time-nuts] Terrestrial Tides and Land Movement
time-nuts@febo.com
Sent: Monday, May 25, 2015 1:53 PM
Subject: Re: [time-nuts] Terrestrial Tides and Land Movement
Hi
If you happen to *need* precise time on a moving platform, then GPS can
do that as well. There are a number of military systems that have this need.
There are also some
How is this achieved? Is there a coupled dead-reckoning system that updates
the timing location, or something else?
Hi BobS,
No need for dead-reckoning -- GPS gives you the location. And the time.
Take a step back and remember how GPS works. You have sats flying above that
essentially send
GPSDO engine.
Bob
From: Tom Van Baak t...@leapsecond.com
To: Discussion of Precise Time and Frequency Measurement time-nuts@febo.com
Sent: Monday, May 25, 2015 3:09 PM
Subject: Re: [time-nuts] Terrestrial Tides and Land Movement
Hi Bob,
You only need a survey if your timing receiver
On Sat, 16 May 2015 04:41:15 + (UTC)
Bob Stewart b...@evoria.net wrote:
I did some idle searching trying to see if there was a relationship between
terrestrial tides and timing receivers. I couldn't find anything useful, but
I did discover that the Jersey Village area, about 2 miles
Hi Bob:
There may be two factors here.
One is the sinking that here in California is do to pumping out ground water. It's measured by the GRACE satellite
system.
https://en.wikipedia.org/wiki/Gravity_Recovery_and_Climate_Experiment
PS It's beginning to look like water is similar to oil, once
On 05/16/2015 12:41 AM, Bob Stewart wrote:
I did some idle searching trying to see if there was a relationship between
terrestrial tides and timing receivers. I couldn't find anything useful, but I
did discover that the Jersey Village area, about 2 miles northeast of me, is
sinking about 2
Hi
Tides are complicated once you get on land. They aren’t as simple as you might
think when you are on the sea. There are people out there
who are “Tide Nuts” and every bit as obsessive as Time Nuts.
Most of the time and most of the places, you get roughly a third of a meter
change in
I did some idle searching trying to see if there was a relationship between
terrestrial tides and timing receivers. I couldn't find anything useful, but I
did discover that the Jersey Village area, about 2 miles northeast of me, is
sinking about 2 inches a year. So, my question is what effect
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