Single Point Positioning using Dual Frequency NavIC Receiver Data

The Indian Regional Navigation Satellite System (IRNSS) is a regional satellite based navigation system developed and operated by India covering the Indian region extending up to 1500 km around to give timing and real-time positioning service. IRNSS, also known as NavIC (Navigation with Indian Constellation) provides Standard Positioning Services (SPS) and encrypted Restricted Services (RS) for civilian users and authorized users respectively. The data received from the NavIC receiver in RINEX file format needs to go through different types of corrections to estimate the position of the receiver. In this paper, broadcast-based clock and orbit correction, relativistic correction, and dual-frequency ionosphere correction are applied to the RINEX data received from NavIC Receiver and Least Square Method is used as the estimation technique to compute the location of the NavIC receiver. Absolute errors between the actual and estimated position of the receiver and ground track are estimated and plotted. For visualization, the actual and estimated positions of the receiver are pinpointed on Google Earth. Clock error, ionosphere error, and relative error are extracted and also plotted for each satellite used in the computation (both the frequencies L5 band-1176.45 MHz and S band-2492.028 MHz) to separately analyze the obtained errors with respect to time. The accuracy by implementing Single Point Positioning is less than 10 meters.