On Fri, 2007-03-09 at 12:46 +0000, Al Johnson wrote: ... > > > > So *military* devices does it. But not civil. > > This is for *civil* devices. > > http://pro.magellangps.com/en/products/aboutgps/dgps.asp > http://pro.magellangps.com/en/products/aboutgps/rtk.asp > http://en.wikipedia.org/wiki/Real_Time_Kinematic > > Here's a civil device using RTK that "determines the position to centimeter > accuracy within a few seconds at ranges up to 50 km from a reference station" > http://www.leica-geosystems.com/uk/en/lgs_8276.htm > > In the UK the Ordnance Survey is making its data available for commercial RTK > networks. > http://www.ordnancesurvey.co.uk/oswebsite/gps/commercialservices/index.html
Very interesting thread. Took the liberty of adding some ideas entitled "Cooperative Differential GPS" related to this to the Summer_of_code Wiki page: http://wiki.openmoko.org/wiki/Summer_of_code Please edit as appropriate to expand/correct. Phil
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