PSN-L Email List Message

Subject: RE: War-time GPS
From: Jim Hannon jmhannon@........
Date: Sun, 23 Sep 2001 20:27:58 -0500

I am not sure the selective avaliability affects the time of the GPS but 
lets look at the wost case and say the time error causes the postion error. 
The speed of light is 300,000,000 meters per second so the maximum time 
error could be 0.33 microsecond. Not much to worry about for seismic work.

At 08:55 PM 9/23/01 -0400, you wrote:
>I guess a question is in order:
>Does the timing accuracy required for amateur seismology exceed the time
>differential needed to offset a GPS position about 100 M, the about of
>displacement you get when the GPS is degraded.
>I do not know, but I am certain someone out there probably does......
>Bob Hancock

Jim Hannon


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Larry Cochrane <cochrane@..............>