Improving the Position Accuracy of Rover Receiver using Differential Positioning in Indian Regional Navigation Satellite System

Document Type : Original Article


Advanced GNSS Research Laboratory, Department of ECE, University College of Engineering, Osmania University, Hyderabad, India


Navigation with Indian Constellation (NavIC) is the Indian Regional Navigation Satellite System (IRNSS) developed by Indian Space Research Organization (ISRO) to provide the position and navigation services for Indian region. NavIC or IRNSS is individual satellite constellation which has seven satellites covering the Indian subcontinent. Accuracy of NavIC standalone is insufficient in certain applications such as civil aviation. To improve the position accuracy performance of NavIC system, differential positioning technique is utilized. In this paper, differential positioning is carried out, considering two IGS (IRNSS-GPS-SBAS) receivers (one as reference station and the other as rover), which are capable of receiving IRNSS signals from 7 satellites, GPS signals from 12 satellites, SBAS signals from 2 satellites. Here, NavIC constellation alone is considered for the analysis. The differential positioning is carried out using the pseudorange measurements on L5 (1176.45 MHz), S1 (2492.028 MHz) and dual (L5 and S1 both) and accuracies are compared in terms of the statistical parameters Circular Error Probability (CEP), Distance Root Mean Square (DRMS), 2DRMS (twice the DRMS). The improvement in the horizontal accuracy (2DRMS) of the rover using pseudorange measurements on L5 is observed to be 78.81%, on S1 it is 69.14 % and using dual frequency (L5 and S1 both) it is 80.73% when compared to NavIC standalone.


Main Subjects

  1. Devireddy, K., Narsetty, S., Ramavath, A.K. and Perumalla, N.K., "Validation of the iri‐2016 model with indian navic data for future navigation applications", IET Radar, Sonar & Navigation, Vol. 15, No. 1, (2021), 37-50.
  2. Kumar, D.K.P.N., "Performance evaluation of global ionospheric models with indian regional navigation data over low latitude station during low solar activity year 2017", Performance Evaluation, Vol. 114, (2021), 279-295. doi: 10.2528/PIERC21053101.
  3. Kuna, D., Santhosh, N. and Perumalla, N.K., "Preliminary analysis of standalone galileo and navic in the context of positioning performance for low latitude region", Procedia Computer Science, Vol. 171, (2020), 225-234.
  4. Seeber, G., Satellite geodesy.-2-nd edition. 2003, Berlin, New York: Walter de Gruyter.
  5. Kaplan, E.D. and Hegarty, C., "Understanding gps/gnss: Principles and applications, Artech house, (2017).
  6. Parveen, S.N. and Siddaiahx, P., "Position error calculations for irnss system using pseudo range method"
  7. Madhu Krishna, K., Naveen Kumar, P. and Naraiah, R., "Prediction of differential gps corrections using ar and arma models", in Advances in Decision Sciences, Image Processing, Security and Computer Vision: International Conference on Emerging Trends in Engineering (ICETE), Vol. 2, Springer. (2020), 290-298.
  8. Misra, P. and Enge, P., "Global positioning system: Signals, measurements & performance", IEEE Aerospace and Electronic Systems Magazine, Vol. 17, No. 10, (2002), 36-37.
  9. Sridher, T., Sarma, A. and Naveen Kumar, P., "Performance evaluation of onboard wi-fi module antennas in terms of orientation and position for iot applications", International Journal of Engineering, Transactions A: Basics, Vol. 35, No. 10, (2022), 1918-1928.
  10. Voosoghi, B. and Rastbood, A., "Fixing of cycle slips in dual-frequency gps phase observables using discrete wavelet transforms", International Journal of Engineering, Transactions B: Applications, Vol. 21, No. 1, (2008), 9-26.
  11. Devireddy, K., Abedin, N.U., Kuna, D. and Kumar, P.N., "Analysis of various parameters of l5 and s1 navic signals over low latitude region", Procedia Computer Science, Vol. 171, (2020), 2704-2712.
  12. Sharma, A., Gurav, O., Bose, A., Gaikwad, H., Chavan, G., Santra, A., Kamble, S. and Vhatkar, R., "Potential of irnss/navic l5 signals for ionospheric studies", Advances in Space Research, Vol. 63, No. 10, (2019), 3131-3138.
  13. Althaf, A. and Hablani, H.B., "Static baseline estimation using navic pseudoranges: A long-term study", IETE Technical Review, Vol. 39, No. 4, (2022), 827-837.
  14. Mingqin, S. and Xiuping, S., "Study on differential gps positioning methods", Hangzhou, China: IEEE, (2015).
  15. Krishna, K.S. and Ratnam, D.V., "Determination of navic differential code biases using gps and navic observations", Geodesy and Geodynamics, Vol. 11, No. 2, (2020), 97-105.
  16. Naveen Kumar, P., Sarma, A.D. and Supraja Reddy, A., "Modelling of ionospheric time delay of global positioning system (GPS) signals using taylor series expansion for gps aided geo augmented navigation applications", IET Radar, Sonar & Navigation, Vol. 8, No. 9, (2014), 1081-1090.
  17. Sundara, R.R. and Raju, G., Estimation of indian regional navigation satellite system receiver’s position accuracy in terms of statistical parameters. 2022, SAE Technical Paper.
  18. Shukla, A., Thakkar, P. and Ganatra, A., "Navic carrier-phase based relative positioning using l5 single frequency measurements", in 4th International Conference on Science, Technology and Management (ICSTM). Vol. 4, (2017), 134-139.
  19. Chin, G.Y., Two-dimensional measures of accuracy in navigational systems. 1987, United States. Dept. of Transportation. Office of Research and Special Programs.
  20. Kuna, D., Perumalla, N.K. and Anil Kumar, R., "Positioning parameters for stand-alone and hybrid modes of the indian navic system: Preliminary analysis", in Advances in Decision Sciences, Image Processing, Security and Computer Vision: International Conference on Emerging Trends in Engineering (ICETE), Vol. 2, Springer., (2020), 299-306.
  21. Specht, M., "Statistical distribution analysis of navigation positioning system errors—issue of the empirical sample size", Sensors, Vol. 20, No. 24, (2020), 7144.