Astrophysics and Space Science

, 364:196 | Cite as

Analysis of signal strength, satellite visibility, position accuracy and ionospheric TEC estimation of IRNSS

  • R. MukeshEmail author
  • V. Karthikeyan
  • P. Soma
  • P. Sindhu
Original Article


The Indian Regional Navigation Satellite System (IRNSS) is an indigenously developed satellite navigation system to meet practical needs. The system, comprising a constellation of seven satellites in GEO orbit, has been fully operational since 2018. It is essential to evaluate the performance of the IRNSS continuously for various applications. As a part of ISRO field trial and data collection program an IRNSS Standard Positioning Service User Receiver (UR) placed at ACS College of Engineering (ACSCE), Bangalore, for independent field trial and data collection. The receiver is operational on a \(24\times 7\) basis. A MATLAB Graphical User Interface has been developed to analyze and plot the data variation of signal strength, elevation angle, visibility of satellites, user position, position error, geometric dilution of precision (GDOP) and find the availability of the number of satellites plotted for every second based on the received data. From the results, it is observed that the signal strength (C/No) is good, i.e. above 40 dBHz, visibility of satellites at receiver location is good. The mean position at user location is found to be \(X=1349700~\mbox{m}\), \(Y = 6070902~\mbox{m}\), \(Z = 1413860~\mbox{m}\) and latitude of 12.8914 degree, longitude of 77.465 degree and altitude of 739 m. The mean position from IRNSS is compared with Google map results showing a good match. The geometry distance of receiver location with respect to Earth center is estimated and observed. The RMS of position error for L1, L5 and dual frequency (L5+S) at ACSCE, Bangalore, is 9.7444 m, 6.6873 m and 5.6667 m, respectively. Hence, as expected the dual-frequency (L5+S) receiver gives an accurate position rather than the single-frequency signals. The IRNSS TEC is measured using Ionospheric group delay and the pseudo-range of L5 and S band which is collected from ACSCE receiver. A third order Savitzky-Golay-Filtered technique is used for TEC smoothing. RMSE between IRNSS TEC from pseudo-range and GPS TEC is 0.6482 TECU and the correlation coefficient is 0.9981. RMSE between IRNSS TEC from ionospheric delay of L5/S and GPS TEC is 1.971 TECU and the correlation coefficient is 0.9966. Finally, smoothed TEC values derived from pseudo-range measurements give a good result and can be used to generate daily TEC maps. In order to analyze the performance of IRNSS over the Indian region, we have chosen three other receiver stations located at Osmania University (Hyderabad), University of Burdwan (Bardhaman, West Bengal) and Shri Mata Vaishno Devi University (Katra, Jammu and Kashmir). Based on the results, we conclude that the IRNSS constellation is performing well and providing good signals for accurate user position determination and ionospheric data analysis.


IRNSS Carrier to noise ratio (C/No) Position error Total electron content 

List of symbols


position of \(x\) coordinate


position of \(y\) coordinate


position of \(z\) coordinate


reference position of \(x\) coordinate


reference position of \(y\) coordinate


reference position of \(z\) coordinate


minimum of bias_\(x\)


minimum of bias_\(y\)


minimum of bias_\(z\)


maximum of bias_\(x\)


maximum of bias_\(x\)


maximum of bias_\(z\)


RMS of Position error


User radial distance for every second with respect to Earth center



The authors would like to express their sincere gratitude to the Space Application Centre—Indian Space Research Organization (SAC-ISRO), for providing the IRNSS receiver for field trail and data collection. The authors acknowledge the necessary infrastructure and supporting facility provided by ACS College of Engineering, Bangalore.


  1. Arikan, F., Erol, C.B., Arikan, O.: Regularized estimation of vertical total electron content from GPS data for a desired time period. Radio Sci. 39(6), 1–10 (2004) CrossRefGoogle Scholar
  2. Arikan, F., Arikan, O., Erol, C.B.: Regularized estimation of TEC from GPS data for certain mid latitude stations and comparisons with the IRI model. Adv. Space Res. 39(5), 867–874 (2007) ADSCrossRefGoogle Scholar
  3. Badeke, R., Borries, C., Hoque, M., Minkwitz, D.: Empirical forecast of quiet time ionospheric total electron content maps over Europe. Adv. Space Res. 61(12), 2881–2890 (2018) ADSCrossRefGoogle Scholar
  4. Chandrasekar, M.V., Rajarajan, D., Neetha Tirmal G, S., Rathnakara S, C., Ganeshan A, S.: Modernized IRNSS broadcast ephemeris parameters. J. Control Theory Inf. 5(2) (2015) Google Scholar
  5. Cui, J-x., Shi, H-l., Pang, F.: Azimuth and elevation of slightly inclined geostationary-satellite orbits. In: International Conference on Computer Engineering and Technology. (2009), IEEE Xplore Google Scholar
  6. Ganeshan, A.S., Rathnakara, S.C., Gupta, R., Jain, A.K.: Indian Regional Navigation Satellite System (IRNSS) concept. J. Spacecr. Technol. 15(2), 19–23 (2005) Google Scholar
  7. Gayathri, K.M., Thangadurai, N., Vasudha, M.P.: Performance analysis of IRNSS receiver signal strength and accuracy on a moving vehicle. In: International Conference on Advanced Communication Control and Computing Technologies (2016), IEEE Xplore Google Scholar
  8. Klobuchar, J.A.: Ionospheric time-delay algorithm for single-frequency GPS users. IEEE Trans. Aerosp. Electron. Syst. 23(3), 325–331 (1987) ADSCrossRefGoogle Scholar
  9. Li, J., Nie, J., Li, B., Wang, F.: Increase of carrier-to-noise ratio in GPS receivers caused by continuous-wave interference. Radioengineering 25(3), 506–517 (2016) CrossRefGoogle Scholar
  10. Mendillo, M.: Storms in the ionosphere: patterns and processes for total electron content. Rev. Geophys. 44(4) (2006) Google Scholar
  11. Naveen Pitchumani, S., Arun Sundar, S., Srinivasan, T., Savithri, S.: Mathematical modelling of Indian regional navigation satellite system receiver. Def. Sci. J. 67(4), 443 (2017) CrossRefGoogle Scholar
  12. Norsuzila, Y., Abdullah, M., Ismail, M., Ibrahi, M., Zakaria, Z.: Total electron content (TEC) and estimation of positioning error using Malaysia data. In: Proceedings of the World Congress on Engineering, vol. 1, pp. 715–719 (2010) Google Scholar
  13. Radzol, A.R.M., Lee, K.Y., Mansor, W., Azman, A.: Optimization of Savitzky–Golay smoothing filter for salivary surface enhanced Raman spectra of non-structural protein 1. In: TENCON. (2014), IEEE Xplore Google Scholar
  14. Raghu, N., Kiran, B., Manjunatha, K.N.: Tracking of IRNSS, GPS and hybrid satellites by using IRNSS receiver in STK simulation. In: International Conference on Communication and Signal Processing (2016), IEEE Xplore Google Scholar
  15. Rao, V.G, Lachapelle, G., VijayKumar, S.B.: Analysis of IRNSS over Indian subcontinent. In: Proceedings of the 2011 International Technical Meeting of the Institute of Navigation, San Diego, CA, pp. 1150–1162 (2011) Google Scholar
  16. Sharma, S.K.: Ionospheric TEC variation over Manama, Bahrain and comparison with NeQuick-2 model. Astrophys. Space Sci. 364(16) (2019) Google Scholar
  17. Srilatha Indira Dutt, V.B.S., Gowsuddin, S.: Ionospheric delay estimation using Klobuchar algorithm for single frequency GPS receivers. Int. J. Adv. Res. Electron. Commun. Eng. 2(2), 202–207 (2013) Google Scholar
  18. Vasudha, M.P., Raju, G.: Comparative evaluation of IRNSS performance with special reference to positional accuracy. Gyroscopy Navig. 8(2), 136–149 (2017) CrossRefGoogle Scholar
  19. Wu, W.-C., Wang, T.-H., Chiu, C.-T.: Edge curve scaling and smoothing with cubic spline interpolation for image up scaling. In: IEEE Workshop on Signal Processing Systems (2013), IEEE Xplore Google Scholar
  20. Wu, F., Kubo, N., Yasuda, A.: Performance analysis of GPS augmentation using Japanese Quasi-Zenith Satellite System. Earth Planets Space 56, 25–37 (2014) ADSCrossRefGoogle Scholar

Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  • R. Mukesh
    • 1
    • 2
    Email author
  • V. Karthikeyan
    • 2
  • P. Soma
    • 1
  • P. Sindhu
    • 1
  1. 1.Department of Aerospace EngineeringACS College of EngineeringBangaloreIndia
  2. 2.Department of ECEDr. MGR Educational and Research InstituteChennaiIndia

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