Positioning quality of GPS sensors in smartphones [Elektronski vir]
Lovenjak, Klemen ...
One of the basic tasks of geodesy is determination of accurate position (coordinates) in terrestrial coordinate systems. Due to a rapid technological and satellite geodesy development, also a common ...user nowadays is able to find out his position accurately, despite not being familiar with concepts of satellite aided positioning. These concepts are available in respective textbooks,1 but besides position itself the position quality is of great importance. We may stress that GPS does not provide information regarding quality of acquired position.2 Absence of relevant information about positioning quality was the motivation for our testing of few GPS sensors, available in present-day smartphones. Four groups of tests were set up i. e. for testing position quality in static and kinematic mode and in good and difficult conditions for the reception of satellite signal. Testing of static receiver was performed according to previously determined reference positions and for moving receiver test we developed our own procedure for reference position determination using the tachymeters able to track the moving target which was time-synchronised with GPS time. In both cases the reference positions were determined with cm level position accuracy. Static position quality was estimated according to 70 positions. Moving receiver testing was done by evaluating approx. 600 positions at walking speed.
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