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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: SA eliminator
From: Dave Boatman
Date: 1997 Dec 13, 12:02 PM
From: Dave Boatman
Date: 1997 Dec 13, 12:02 PM
At 07:32 AM 12/13/97 -0800, you wrote: [snip] >it to its theoretical limits, but I have heard from a friend that >surveyors use something like this to achieve accuracy in that order. > > I suppose the trick would be finding a point of known La, Lo that met >the demands of accuracy sufficient to test the GPS. > > I hope that anyone with more and better information will feel free to >correct me for any errors here. > > Mal Misuraca I'll lend some knowledge as to the surveyors. I spent some time with the surveyors of a large construction project here, building a bridge across Pearl Harbor onto Ford Island. The surveyors were walking around with radio packs and antennas on their backs so I just *HAD* to find out all about it. Turns out they placed portable repeater antennas right nearby on the hillsides around here and were using a differential GPS to triangulate the placement of the 400 concrete pilings for the bridge. They claimed an accuracy of 3/4 of an inch for each piling. The point being that, at least on this project, they didn't use averaging and a computer but direct GPS from a surveyed portable antenna. Maybe someone who is a surveyor can be more specific as to the technical details. Dave Boatman Fantasia35 LAKA/Honolulu dboat@lava.net =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-= =-= TO UNSUBSCRIBE, send this message to majordomo@ronin.com: =-= =-= navigation =-= =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=--=-=
