Performance Analysis of Algorithms for NavIC Signal Acquisition | Chapter 3 | Current Topics on Mathematics and Computer Science Vol. 1

 The Indian Space Research Organization (ISRO) created and designed the Indian Regional Navigation Satellite System (IRNSS), a self-contained navigation system. The Indian Prime Minister has named it NavIC, Navigation with Indian Constellation. NavIC is a seven-satellite constellation that will provide accurate positioning to India. Services such as navigation and timing are available. Acquisition, tracking, and navigation are the primary modules of the NavIC receiver. The data processing unit responsible for recognizing satellite signals and their associated code phase and carrier frequency. is referred to as acquisition. Several acquisition strategies, such as serial search and parallel code phase search, are available. In this chapter, algorithms are investigated and contrasted with Cooley-Tukey FFT and sub-sampled Fast Fourier transform techniques (ssFFT). According to MATLAB results, the acquisition computation time for a ssFFT-based NavIC receiver is faster than parallel FFT acquisition, and the Cooley-Tukey FFT IRNSS acquisition algorithm is faster and offers better code phase and carrier frequency values than the serial search acquisition approach. The use of sparse FFT, Fourier transform, and decimator properties, as well as the use of sub sampled FFT, results in a reduction in acquisition time and computation complexity.

Author(s) Details

Dr. N. Alivelu Manga
Department of ECE, Chaitanya Bharathi Institute of Technology (A), Hyderabad, India.

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Study of IRNSS Receiver Doppler Positioning in Kinematic Conditions | Chapter 8 | Recent Developments in Engineering Research Vol. 3

 

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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