NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: GPS Accuracy Now.
From: Craig Scott
Date: 2000 May 03, 00:01 EDT
From: Craig Scott
Date: 2000 May 03, 00:01 EDT
* Selective Availability (SA)
* SA is the intentional degradation of the SPS signals by a time varying
bias. SA is controlled by the DOD to limit accuracy for non-U. S. military
and government users. The potential accuracy of the C/A code of around 30
meters is reduced to 100 meters (two standard deviations).
http://www.colorado.edu/geography/gcraft/notes/gps/gps_f.html
The above is a very good reference on GPS. It seems to indicate an expected
accuracy of 30 metres with SA turned off on non-DGPS receivers. The site
has much more information on this and other errors.
Craig
-----Original Message-----
From: Navigation Mailing List [mailto:NAVIGATION-L@XXX.XXX]On
Behalf Of Ed Kitchin
Sent: Tuesday, May 02, 2000 16:34
To: NAVIGATION-L@XXX.XXX
Subject: GPS Accuracy Now.
With the reality that the government has now taken off "selective
availability", does this mean that the DGPS is now an obsolete piece of
equipment? What kind of accuracy can one expect to be the norm now? 1 - 5
meters? Does anyone know?
Ed
