From: Chris Albertson albertson.ch...@gmail.com
To: Bob Stewart b...@evoria.net; Discussion of precise time and frequency
measurement time-nuts@febo.com
Sent: Saturday, November 9, 2013 11:08 AM
Subject: Re: [time-nuts] Computing GPS Distance Error in Time
If you
it to the plot I'm already doing
for timing. So that will work.
thanks,
bob
From: Mark Sims hol...@hotmail.com
To: time-nuts@febo.com time-nuts@febo.com
Sent: Thursday, November 7, 2013 12:14 PM
Subject: [time-nuts] Computing GPS Distance Error
I'm not using any special surveying software, just some code that I wrote.
The controller box and remote box both have GPS units in them. The controller
periodically requests the remote unit's position and just calculates the vector
distance/bearing between the two units. The application
: [time-nuts] Computing GPS Distance Error in Time
I'm not using any special surveying software, just some code that I wrote.
The controller box and remote box both have GPS units in them. The controller
periodically requests the remote unit's position and just calculates the
vector distance
Hi Mark:
In the early days of GPS the poor man's correction was to do the math on the position. But a better method is to
correct the path for each satellite.
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
Mark Sims wrote:
I'm not using any
I am only interested in the relative distance and bearing between the control
and remote boxes. What I am doing amounts to differential GPS. The receivers
are pretty much influenced by the same atmospheric, etc distortions that affect
absolute positioning accuracy. When the two sets of
Lady Heather has the ability to plot position fixes. If you are handy with
programming you could insert some sort of NEMA to TSIP converter between the
AdaFruit and a computer running Lady Heather. You would need to emulate a few
of the TSIP packet (like primary timing, secondary timing,
@febo.com
Sent: Monday, November 4, 2013 7:13 PM
Subject: [time-nuts] Computing GPS Distance Error in Time
I was using the Adafruit GPS receivers to calculate the bearing and distance
between two boxes that had radio tranceivers in them. The control box polls
the remote box position and does
Hi
I don’t know about the Adafruit GPS, but I do believe that GPS time is
independent of position. Put another way, GPS time is exactly the same here in
PA as it is anywhere else on the planet.
As the GPS computes locations it also computes time. If location is wandering
around, the same
Rule of thumb: every meter off in survey altitude is three nanoseconds.
The error due to inaccurate latitude/longitude is much smaller in
nanoseconds per meter for any reasonable viewable sky.
Tim N3QE
On Sun, Nov 3, 2013 at 10:51 PM, Bob Stewart b...@evoria.net wrote:
I'm experimenting with
On Mon, Nov 4, 2013 at 3:51 AM, Bob Camp li...@rtty.us wrote:
. I can guess it's a vector difference between each two successive
points converted to ns,
That vector difference has to include altitude. Then as you say, convert
distance to time via the speed of light. But I think this is
The pps on that unit is good. Compares favorably to the ublox6T. I can't say
how favorably.
I am working on quantifying its pps as compared to my 2 fury units and the
ublox 6T.
Awaiting a 8 antenna splitter, and dso.
Have another trick up my sleeve but need a Linux kernel hacker. I
@febo.com
Sent: Monday, November 4, 2013 11:07 AM
Subject: Re: [time-nuts] Computing GPS Distance Error in Time
On Mon, Nov 4, 2013 at 3:51 AM, Bob Camp li...@rtty.us wrote:
. I can guess it's a vector difference between each two successive
points converted to ns,
That vector difference has
...@gmail.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Monday, November 4, 2013 11:30 AM
Subject: Re: [time-nuts] Computing GPS Distance Error in Time
The pps on that unit is good. Compares favorably to the ublox6T. I can't say
how favorably.
I am
-nuts] Computing GPS Distance Error in Time
The pps on that unit is good. Compares favorably to the ublox6T. I can't
say how favorably.
I am working on quantifying its pps as compared to my 2 fury units and
the ublox 6T.
Awaiting a 8 antenna splitter, and dso.
Have another trick up
On 11/04/2013 06:30 PM, Bill Dailey wrote:
The pps on that unit is good. Compares favorably to the ublox6T. I can't say
how favorably.
I am working on quantifying its pps as compared to my 2 fury units and the
ublox 6T.
They are pretty good, being dirt cheap nav receivers. In this
From: Kasper Pedersen time-n...@kasperkp.dk
When testing, try fast temperature shifts; I found that it would shift the PPS
much more than I expected, as if there is a rather slow filter
driving the PPS output.
Now that's something I hadn't thought of. I'll need to put at least a cover
over my
I was using the Adafruit GPS receivers to calculate the bearing and distance
between two boxes that had radio tranceivers in them. The control box polls
the remote box position and does simple trig on the difference between the GPS
coordinates. I noticed that the Adafruit GPS seems to go
I'm experimenting with an Adafruit receiver (MTK3339) and I'd like to be able
to compute the time error delta between each reported position. I can guess
it's a vector difference between each two successive points converted to ns,
but beyond that, I don't know what to do. IOW, I need to know
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