Improving the Position Accuracy of Rover Receiver using Differential Positioning in Indian Regional Navigation Satellite System

Navigation with Indian Constellation (NavIC) is the Indian Regional Navigation Satellite System (IRNSS) developed by Indian Space Research Organization (ISRO) to provide the position and navigation services for Indian region. NavIC or IRNSS is individual satellite constellation which has seven satellites covering the Indian subcontinent. Accuracy of NavIC standalone is insufficient in certain applications such as civil aviation. To improve the position accuracy performance of NavIC system, differential positioning technique is utilized. In this paper, differential positioning is carried out, considering two IGS (IRNSS-GPS-SBAS) receivers (one as reference station and the other as rover), which are capable of receiving IRNSS signals from ۷ satellites, GPS signals from ۱۲ satellites, SBAS signals from ۲ satellites. Here, NavIC constellation alone is considered for the analysis. The differential positioning is carried out using the pseudorange measurements on L۵ (۱۱۷۶.۴۵ MHz), S۱ (۲۴۹۲.۰۲۸ MHz) and dual (L۵ and S۱ both) and accuracies are compared in terms of the statistical parameters Circular Error Probability (CEP), Distance Root Mean Square (DRMS), ۲DRMS (twice the DRMS). The improvement in the horizontal accuracy (۲DRMS) of the rover using pseudorange measurements on L۵ is observed to be ۷۸.۸۱%, on S۱ it is ۶۹.۱۴ % and using dual frequency (L۵ and S۱ both) it is ۸۰.۷۳% when compared to NavIC standalone.

کلیدواژه ها:

NavIC ، Differential IRNSS ، positional accuracy ، Differential Corrections