Abstract
Abstract The NavIC/IRNSS (Navigation with Indian Constellation/ Indian Regional Navigation Satellite System) is an autonomous Indian based regional navigation system. The system is intended to provide navigation signals over the Indian region and 1500 kms around. It is necessary to evaluate the performance of NavIC system over the Indian region. In this paper various parameters (Tropospheric delay, C/No, Doppler frequency and vertical ionospheric delay) of the NavIC L5 and S1 signals are evaluated. The analysis is carried out for quiet (26th May, 2017) and disturbed days (28th May, 2017) over low latitude Hyderabad station (17.390 N, 78.310 E), India. The vertical ionospheric delay is the most considerable parameter of NavIC system. In this work, vertical ionospheric delay is estimated using single frequency global ionospheric models like Klobuchar and Grid models. The obtained results are compared with real time NavIC data for both L5 and S1 signals and the results are encouraging. The position accuracy parameters are also evaluated for L5 and S1 modes of receiver operation on a typical day (25th January, 2019). This work finds applications in development of single frequency NavIC receiver for civilian navigation applications.
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