[time-nuts] GPS position

Chris Albertson albertson.chris at gmail.com
Mon May 2 12:13:18 EDT 2016


A man with a GPS knows where he is.  A man with two GPS' not not sure.

I've always wanted to walk my self-survey GPS over to a brass USGS
benchmark and see it the GPS matches to benchmark location.  OK, I've done
this with a hand held GPS and gotten readings within about 10 meters.

But before spending a lot of time removing the lat 10cm of error I'd do a
test at the nearest BM that is not in the middle of a street.

What has stopped me from doing this is that a few years ago I had to have
my lot lines surveyed.  They got to better then 1/10 of a foot at each
corner and shot  some brass markers into the concrete.    Google can see my
house's roof ridge lines and the concrete so I can work out the exact
location of the roof mount antenna to within maybe 18 inches.  It seems to
agree with the survey as long as everyone uses WGS84.

On Sun, May 1, 2016 at 11:44 PM, Joseph Gray <jgray at zianet.com> wrote:

> Now that I have three (maybe four) working GPSDO's, I'd like to set
> the GPS coordinates the same on all of them. The survey that each one
> does produces very similar coordinates, but not exactly the same.
>
> The Z3801A's have VP's, the Lucent has a UT+. I don't know what is in
> the 58540A, as the manual doesn't say and the :DIAG:IDEN:GPS? command
> isn't supported.
>
> Would using a modern GPS, like a uBlox, and averaging for quite a
> while produce acceptable coordinates to manually enter into all of the
> GPSDO's? Of course the uBlox would be on the same splitter and antenna
> as the other units during the averaging.
>
>
> Joe Gray
> W5JG
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-- 

Chris Albertson
Redondo Beach, California


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