In this paper, the authors have attempted to provide a comprehensive account of the Indian Regional Navigation Satellite System (IRNSS). The paper describes the coverage area, the space segment, ground segment, and user segment of IRNSS. The orbital parameters of all seven satellites in the IRNSS constellation have been reported. Some important definitions related to space crafts have been explained. The paper presents the method to estimate the receiver’s position and the algorithm involved. The paper also discusses various sources of error in position estimation. The paper gives a detailed description of the trajectories of all seven satellites in the constellation. The paper presents the Slant Tropospheric Delay (STD) obtained over the National Atmospheric Research Laboratory, Gadanki; National Institute of Oceanography, Goa; Regional Meteorological Centre, Kolkata; Indian Institute of Technology, Bhubaneswar; and Sona Synthetics, Kanakapura, Bangalore.
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