Hi Bruce:
From what I can learn about "seeing" the atmosphere instability is too
great to allow making measurements optically in the 1 ms area.
It's a couple of acres.
Have Fun,
Brooke Clarke
http://www.PRC68.com
Bruce Griffiths wrote:
Brooke Clarke wrote:
Hi:
For a number of decades I've tried to figure out a way to measure the
period of the Earth's rotation accurate to at least 1 ms.
For some thoughts (since I don't think it will work) on doing it
optically see:
http://www.prc68.com/I/StellarTime.shtml
Is it possible to do it using a radio method in my (large) back yard?
1ms corresponds to an angle of 15 milliarcsec or 73 nrad for 0
declination objects.
15 milliarc sec positioning accuracy is just within the capability of
an 7" aperture transit circle or PZT equipped with a CCD camera.
This accuracy was close to that achievable with a video camera
equipped transit circle in the late 1980's.
A 2900 km diameter dish or equivalent has a resolution of about 73
nrad at 1420MHz.
Position accuracy for a point source can be somewhat higher than the
resolution if the SNR is sufficiently high.
However an antenna system of several hundred km in extent is likely to
be necessary.
Just how large is your backyard?
Bruce
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