Abstract

The aim of this work is to precisely estimate the IRNSS satellite’s orbit and clock errors using NavIC receiver data. Orbit determination is required to precisely calculate the user/receiver position on the Earth. In this study, Bengaluru, Surat, Kolkata, and Hyderabad’s NavIC ground receivers’ data is considered for orbit estimation. The pseudo-range measurements received by the ground receivers have multiple errors added due to ionospheric delay, tropospheric delay, multipath delays, satellite clock errors, and some unmodeled effects. But, the major factor accounting for errors is the satellite clock error. Hence, along with position and velocity of the satellite, even the clock correction is estimated using Extended Kalman Filter (EKF). EKF is a sequential estimation algorithm which estimates satellite position, velocity and clock error at each time instant. In this paper, results of all seven IRNSS satellite’s orbit determination are discussed.

Highlights

  • In order to achieve accurate user position, it is first required to know the precise orbit of the navigational satellites

  • Indian Regional Navigation Satellite System (IRNSS) is India’s own navigation system used to provide accurate real-time positioning and timing services over India and the region extending to 1,500 kilometers (930 mi) around India

  • Orbit determination (OD) is done for 7 IRNSS satellites, namely, IRNSS 1B, IRNSS 1C, IRNSS 1D, IRNSS 1E, IRNSS 1F, IRNSS 1G and IRNSS I1 and their respective results are discussed

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Summary

Introduction

Indian Regional Navigation Satellite System (IRNSS) is India’s own navigation system used to provide accurate real-time positioning and timing services over India and the region extending to 1,500 kilometers (930 mi) around India. It is a seven satellite constellation consisting of three are in geo-stationary orbit, namely, IRNSS 1C, IRNSS 1F and IRNSS 1G and four are in geo-synchronous orbit, namely, IRNSS 1B, IRNSS 1D, IRNSS 1E and IRNSS 1I. The three satellites in the Geostationary orbit (GEO) are positioned at 32.5° east, 83° east and 131.5° east longitude respectively.

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