if i have obtain GPS coordinates as Latitude/Longitude, then i need to convert them to XY coordinates, i see this link
actually i need to get the Trilateration , in its equation i need the XY coordinates from GPS coordinates.
i need obvious and clear equation for conversion.
also how the conversion will be if i assume there is reference node !!
my application is :
i need to make Trilateration for sensor nodes and in the middle of the there is pc which get positions of nodes(depends on gps) then pc can calculate its position depend on Trilateration. So Trilateration equation use XY rather than lat/lon ?? can we use the pc as reference node to conversion.