Estimation of Doppler Positioning for Nav IC System in Static and Dynamic Conditions
Sathish Pasika1, D. Krishna Reddy2

1First Author Name*, Department of ECE, Chaitanya Bharathi Institute of Technology (CBIT), Hyderabad (Telangana), India.
2Second Author Name, Department of ECE, Chaitanya Bharathi Institute of Technology (CBIT), Hyderabad, (Telangana) India.
Manuscript received on July 20, 2019. | Revised Manuscript received on August 10, 2019. | Manuscript published on August 30, 2019. | PP: 2868-2873 | Volume-8 Issue-6, August 2019. | Retrieval Number: F8788088619/2019©BEIESP | DOI: 10.35940/ijeat.F8788.088619
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Abstract: The primary objective of any navigation system is to provide accurate user position. Navigation with Indian Constellation (Nav IC) is an emerging regional satellite navigation system being developed by ISRO, India. The positional accuracy of the Nav IC 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 Paper, 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 ±1KHz for geosynchronous satellites in static conditions, whereas it is ±40KHz 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.
Keywords: Doppler positioning, Nav IC, IRNSS, Positional accuracies, dynamic conditions