<b>Techniques of GPS positioning for precision agriculture</b>

Abstract

The analysis was performed to evaluate the accuracy of four GPS acquisition systems. The surveys were conducted by control of the geodesic vertex of GPS net of São Paulo State, Brazil, denominated Botucatu Point. In the first survey the accuracy was determined from autonomous surveys, in a fast way, with a time of reading, except for the Pro-XR, which accomplished readings for posterior post-processing with C/A code between a control station in the São Paulo city and the Botucatu vertex. Another evaluation was with the transport of coordinates from the Botucatu vertex to a place 6.25 km distant. The obtained results were satisfactory for all the investigated systems; therefore, the accuracy of the surveys was according to the specifications of systems, devices and types of accomplished processings.