Improvement of Position Accuracy with GAGAN and the Impact of Scintillation on GNSS

DOI: 10.4236/pos.2013.44028   PDF   HTML     4,931 Downloads   7,285 Views   Citations


GAGAN is an Indian implementation of Satellite Based Augmentation System (SBAS), developed jointly by Airports Authority of India (AAI) and Indian Space Research Organisation (ISRO). It is in final operational phase with all the required ground and space segments ready. With the availability of GAGAN signal-in-space (SIS), the improvement in position solution is investigated using the two collocated dual frequency GPS receivers. One of the receivers was configured as SBAS receiver and the other was kept as GPS stand-alone receiver. It is found that accuracy in position improved significantly in SBAS receiver due to GAGAN correction. The impact of scintillation on GNSS was also investigated in terms of position degradation and loss of lock of the satellite signals. The manyfold effects of scintillation on GPS and SBAS are discussed in detail. The results indicate ~15% reduction in number of measurements due to loss of lock during severe scintillation.

Share and Cite:

S. Sunda, B. M. Vyas, S. V. Satish and K. S. Parikh, "Improvement of Position Accuracy with GAGAN and the Impact of Scintillation on GNSS," Positioning, Vol. 4 No. 4, 2013, pp. 282-288. doi: 10.4236/pos.2013.44028.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] R. Acharya, M. R. Sivaraman, K. Bandyopadhyay, N. Nagori, S. Sunda and S. Regar, “Ionospheric Studies for the Implementation of GAGAN,” Indian Journal of Radio & Space Physics, Vol. 36, No. 5, 2007, pp. 394-404.
[2] RTCA SC-159, “Minimum Operational Performance Standard for Global Positioning System/Wide Area Augmentation System Airborne Equipment,” RTCA/DO-229B, October 6, 1999.
[3] R. J. Kelly and J. M. Davis, “Required Navigation Performance (RNP) for Precision Approach and Landing with GNSS Application,” NAVIGATION: Journal of the Institute of Navigation, Vol. 41, No. 1, 1994, pp. 1-30.
[4] J. Aarons, “Global Morphology of Ionospheric Scintillations,” Proceedings of the IEEE, Vol. 70, No. 4, 1982, pp. 360-378.
[5] S. Basu and K. M. Groves, “Specification and Forecasting of Outages on Satellite Communication and Navigation Systems,” Space Weather, Vol. 125, 2001, pp. 423-430.
[6] K. Groves, et al., “Equatorial Scintillation and Systems Support,” Radio Science, Vol. 32, No. 5, 1997, pp. 2047-2064.
[7] P. V. S. Rama Rao, S. Gopi Krishna, K. Niranjan and D. S. V. V. D. Prasad, “Study of Spatial and Temporal Characteristics of L-Band Scintillations over the Indian Low-Latitude Region and Their Possible Effects on GPS Navigation,” Annales Geophysicae, Vol. 24, 2006, pp. 1567-1580.
[8] P. H. Doherty, T. Dehel, J. Klobuchar, S. H. Delay, S. Datta-Barua, E. R. de-Paula and F. S. Rodrigues, “Ionospheric Effects on Low Latitude Space Based Augmentation Systems,” Proceedings of 15th International Technical Meeting (ION GPS), Institution of Navigation, Portland, 2002.
[9] J. Seo, T. Walter and P. Enge, “Availability Impact on GPS Aviation Due to Strong Ionospheric Scintillation,” IEEE Transactions on Aerospace and Electronic Systems, Vol. 47, No. 3, 2011, pp. 1963-1973.
[10] L. Sparks, J. Blanch and N. Pandya, “Estimating Ionospheric Delay Using Kriging: 1. Methodology,” Radio Science, Vol. 46, No. 6, 2011.

comments powered by Disqus

Copyright © 2020 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.