Date of Publication :6th February 2023

Abstract: The Indian Regional Navigation Satellite System (IRNSS) is Indian satellite-based navigation system developed by Indian Space Research Organization (ISRO) which uses L5 and S1 band frequencies. The operational name of the IRNSS is Navigation with Indian Constellation (NavIC). Military and civilian users are provided with positional accuracy of 10 meters and 0.1 meters, respectively. Many sources of error affect the positional accuracy of IRNSS systems, including ionosphere delays, troposphere delays, multipath errors, and receiver errors. There are various methods for compensating for GPS system, including RTK-GPS (Real Time Kinematic GPS), D-GPS (Differential GPS), and A-GPS (Assisted GPS). In this paper SNR and Doppler Effect of receiving signal are taken under consideration and therefore the weak signals are exempted from the calculation of position accuracy. In literature this method is employed to calculate the position accuracy of Global Positioning System (GPS). Experimental testing was conducted in a dense environment under static conditions rather than dynamic conditions in order to verify the performance of the proposed method. Using the proposed method, the position accuracy of IRNSS system is reduced up to 10 m.

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