GNSS Position Accuracy Considering GDOP and UERE for Different Constellation over Bangladesh

GNSS position accuracy is very important as small error can upset the true position determination. Accuracy depends on both accurate measurements and good geometric relationship between the receiver device and the measurement units required for calculation. Dilution of Precision (DOP) and User Equivalent Range Error (UERE) are considered the two parameters that determine the position accuracy. DOP is a unit less parameter, used to describe the satellite geometry and UERE is the total sum of errors involved in satellite communication expressed as the unit of distance. In this paper, an analysis is done by calculating the number of in view satellites and DOP for Bangladesh over a certain period of time considering GPS and Galileo constellation as well as calculating GNSS position accuracy by using the typical UERE value.