A GPSDO typically makes the assumption that the position of its antenna is
fixed and well-known. That removes position uncertainty from the navigation
equations, and allows all the information from the satellite measurements
to be used to improve the time estimate. Errors in this position create
In message
CAPXiX5ricf=Ea0B=c2yr8ix+70srtfj9jeutkguqehh5izb...@mail.gmail.com, Stewart
Cobb writes:
The next best idea is to locate your antenna on Google Maps. [...]
If your GPSDO's self-survey isn't better than the registration of
Google Maps, you have different problems.
In particular, be
On Thu, May 2, 2013 at 5:29 PM, Stewart Cobb stewart.c...@gmail.com wrote:
GPS surveying equipment can easily determine the position of your antenna
to within a few centimeters (~20 ps). Unfortunately, such equipment is
expensive and difficult to borrow.
A high-end GPSDO designed today should
Google maps is NOT that good, it can be off by a lot, tens of meters.
I had to have my property line surveyed some years ago to get a city
building permit. So now I have two brass markers at know position.
The survey crew used traditional transits from a brass benchmark.
Google Earth thinks these
I have a worse than optimal antenna location for my t-bolt and that just choked
on being fed the google earth location which is 7.5 meters away.
Le 2 mai 2013 à 14:22, Poul-Henning Kamp a écrit :
In message
CAPXiX5ricf=Ea0B=c2yr8ix+70srtfj9jeutkguqehh5izb...@mail.gmail.com, Stewart
Cobb
...@febo.com
Date: Thu, 2 May 2013 08:19:17
To: Discussion of precise time and frequency measurementtime-nuts@febo.com
Reply-To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] Precise positions for GPSDOs
Google maps is NOT that good, it can
PHK, the big pdf link in your sneak page is broken (gives 404). Can you
fix that for us?
P.S., while you are there you could change goory' to gory.
On 5/2/2013 5:22 AM, Poul-Henning Kamp wrote:
In message
CAPXiX5ricf=Ea0B=c2yr8ix+70srtfj9jeutkguqehh5izb...@mail.gmail.com, Stewart
Cobb
I fully agree with Chris, do not trust Google Earth for any serious
technical use, I found errors in 100-200 m range. You only need to
check where two images are stitched.
Google Earth images are not produced by Google, they get them from other
companies or government bodies involved in making
