According to this article the earth wobble is 6 meters.

http://www.spacedaily.com/reports/Fi...ation_999.html

Although I knew about a wobble, it never dawned on me that this wobble
was larger than the accuracy of a good waas or dgps corrected signal on
a consumer gps. Do the GPS's account for this wobble in their equations
or is it just treated as yet another error for differential corrections
to deal with?

-wolfgang
--
g+: https://plus.google.com/114566345864337108516/about

On 2011-12-29 05:47 , Wolfgang S. Rupprecht wrote:
>
> According to this article the earth wobble is 6 meters.
>
> http://www.spacedaily.com/reports/Fi...ation_999.html
>
> Although I knew about a wobble, it never dawned on me that this wobble
> was larger than the accuracy of a good waas or dgps corrected signal on
> a consumer gps. Do the GPS's account for this wobble in their equations
> or is it just treated as yet another error for differential corrections
> to deal with?

The satellites are bound to the earth and so they would be continuously
"catching up". Satellites are never in perfectly circular (or even
slightly elliptical orbits - they too have lots of wobbles.

Ephemeris data is to a 5th order polynomial (IIRC) and that may include
the two wobbles described in the article.

--
"We demand rigidly defined areas of doubt and uncertainty."
Douglas Adams - (Could have been a GPS engineer).

On Dec 29, 4:47*am, "Wolfgang S. Rupprecht"
<wolfgang.ruppre...@gmail.com> wrote:
> According to this article the earth wobble is 6 meters.
>
> * *http://www.spacedaily.com/reports/Fi...surement_of_th...
http://hpiers.obspm.fr/eop-pc/

Earth motions such as precession-nutation (including Chandler wobble)
as accounted for by modifying time instead of location.
Start at this site for a detailed explanation.
http://hpiers.obspm.fr/eop-pc/

HTH
Jerry


>
> Although I knew about a wobble, it never dawned on me that this wobble
> was larger than the accuracy of a good waas or dgps corrected signal on
> a consumer gps. *Do the GPS's account for this wobble in their equations
> or is it just treated as yet another error for differential corrections
> to deal with?
>
> -wolfgang
> --
> g+: *https://plus.google.com/114566345864337108516/about

Jerry wrote:
> Earth motions such as precession-nutation (including Chandler wobble)
> as accounted for by modifying time instead of location.
> Start at this site for a detailed explanation.
> http://hpiers.obspm.fr/eop-pc/

Written by HG Wells?

Mike.
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