Study of IRNSS Receiver Doppler Positioning in Kinematic Conditions

The emerging satellite navigation system i.e IRNSS (Indian Regional Navigation Satellite System)
being operational from 2016 with seven satellite constellation. The operational name of the IRNSS is
Navigation with Indian Constellation (NavIC) is developed by ISRO, India. The positional accuracy of
the NavIC depends upon various parameters based on the application. Doppler shift is one among
those parameters which plays an important role in finding the user position in dynamic conditions. The
effect of the Doppler shift is more in high dynamic applications like missiles launching, air navigation
due to high relative velocity between receiver and satellite. In this chapter, an efficient algorithm is
developed to estimate the Doppler positioning using least squares method in static and various
dynamic conditions. For this, the experimental data acquired from Indian Regional Navigation Satellite
System (IRNSS)-GPS receiver located at low latitude station (Hyderabad: 17.39°N, 78.31°E) is used.
A trajectory path has been simulated to estimate the user position and its accuracy measures in low
and high dynamic conditions. It is noticed that, Doppler shift vary ±1 KHz for geosynchronous satellites in static conditions, whereas it is ±40 KHz in high dynamics. It is observed the position error is high in high dynamics as compared with low dynamics because of the higher Doppler shifts

Author (s) Details

Sathish Pasika
Department of ECE, Chaitanya Bharathi Institute of Technology (CBIT), Hyderabad, India.

Prof. D. Krishna Reddy
Department of ECE, Chaitanya Bharathi Institute of Technology (CBIT), Hyderabad, India.

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