Position error calculations for IRNSS system using pseudo range method

Abstract

The Indian Regional Navigation Satellite System (IRNSS) authorizes to determine the location of the user with the help of code measurements, called as pseudo ranges (PR). An alternate method, Differential IRNSS (DIRNSS) which improves the position accuracy of the user with the help of a reference known point by podcasting its correction among the local user. Hence, with the DIRNSS system the position error reduced when compare to IRNSS. In general satellite-navigation system, the Dilution of precision (DOP) unit will depend on parameters such as multipath effect and surrounding atmospheric condition. This precision value will be represented in terms of Geometric DOP, Position DOP, Vertical DOP, and Horizontal DOP. In this paper, positional errors (3D), Geometry Dilution of Precision (GDOP) of IRNSS system is calculated by viewing all operational IRNSS satellites instead of optimum four satellites, which diminishes the complexity and also gives the better value of a precision unit.