GPS Solutions

, Volume 18, Issue 1, pp 147–152 | Cite as

IRNSS-1A: signal and clock characterization of the Indian regional navigation system

  • Steffen Thoelert
  • Oliver Montenbruck
  • Michael Meurer
GNSS In Progress


An initial characterization of the L5 and S-Band navigation signals transmitted by the first satellite of the Indian regional navigation satellite system (IRNSS) is presented. In the absence of a public signal specification, a 30 m high-gain antenna has been used to record the signal spectrum and the modulated chip sequences. For the IRNSS standard positioning service, use of a Gold ranging code is confirmed and relevant shift register parameters for the two frequencies are identified. Based on a prototype receiver, L5 single-frequency code and phase observations of IRNSS-1A have also been collected. The tracking performance is described, and the measurements are used to characterize the short-term clock stability of IRNSS-1A.


IRNSS Signal monitoring Rubidium clock IGSO BPSK-modulation Gold codes 


  1. Dafesh PA, Nguyen TM, Lazar S (1999) Coherent adaptive subcarrier modulation (CASM) for GPS modernization. Institute of Navigation, ION-NTM-1999, San Diego, pp 649–660Google Scholar
  2. Falcone M, Erhard PH, Hein GW (2006) GALILEO. In: Kaplan ED, Hegarty Ch J (eds) Understanding GPS: principles and applications, 2nd edn., pp 559–594Google Scholar
  3. Ganeshan AS (2012) Overview of GNSS and Indian navigation program, GNSS User Meet, Feb. 23, ISRO Satellite Center, BangaloreGoogle Scholar
  4. Ghosal B, Mandal S, Nandanwar S, Raghuwanshi SS, Singh S, Bahl RK, Dasgupta KS, Saxena GM (2011) Demonstration of design verification model of rubidium frequency standard. arXiv preprint arXiv:1109.0277Google Scholar
  5. Gonzalez F, Waller P (2007) Short-term GNSS clock characterization using one-way carrier phase. IEEE 07CH37839; Proc. IEEE Int. Freq. Control Symp. and 21st European Freq. and Time Forum (EFTF), 29 May June 1, Geneva, Switzerland, p 517–522. doi 10.1109/FREQ.2007.4319127
  6. Hauschild A, Montenbruck O, Erker S, Thoelert S, Meurer M, Ashjaee J (2012) A multi-technique approach for characterizing the SVN49 signal anomaly-part 1: receiver tracking and IQ constellation. GPS Solut 16(1):19–28. doi:10.1007/s10291-011-0203-2 CrossRefGoogle Scholar
  7. Hauschild A, Montenbruck O, Steigenberger P (2013) Short-term analysis of GNSS clocks. GPS Solut 17(3):295–307. doi:10.1007/s10291-012-0278-4 CrossRefGoogle Scholar
  8. Langley R, Thoelert S, Meurer M (2013) IRNSS signal close-up. GPS World 24(9):18Google Scholar
  9. Majithiya P, Khatri K, Hota JK (2011) Indian regional navigation satellite system: correction parameters for timing group delays. Inside GNSS 2011:40–46Google Scholar
  10. Misra P, Enge P (2001) Global positing system: signal. measurement, and performance, Ganga-Jamuna PressGoogle Scholar
  11. Montenbruck O, Günther C, Graf S, Garcia-Fernandez M, Furthner J, Kuhlen H (2006) GIOVE-A initial signal analysis. GPS Solut 10(2):146–153. doi:10.1007/s10291-006-0027-7 CrossRefGoogle Scholar
  12. Sekar SB, Sengupta S, Bandyopadhyay K (2012) Spectral compatibility of BOC (5, 2) modulation with existing GNSS signals. IEEE/ION Position Location and Navigation Symposium (PLANS) 2012, pp 886–890Google Scholar
  13. Thoelert S, Meurer M, Erker S, Montenbruck O, Hauschild A, Fenton P (2012) A multi-technique approach for characterizing the SVN49 signal anomaly-part 2: chip shape analysis. GPS Solut 16(1):29–39. doi:10.1007/s10291-011-0204-1 CrossRefGoogle Scholar
  14. Thölert S, Erker S, Meurer M (2009) GNSS signal verification with a high gain antenna: calibration strategies and high quality signal assessment. ION ITM 2009, AnaheimGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Steffen Thoelert
    • 1
  • Oliver Montenbruck
    • 2
  • Michael Meurer
    • 1
    • 3
  1. 1.Institute of Communications and NavigationDeutsches Zentrum für Luft- und Raumfahrt e.V.WesslingGermany
  2. 2.German Space Operations CenterDeutsches Zentrum für Luft- und Raumfahrt e.V.WesslingGermany
  3. 3.Institute of NavigationRWTH Aachen UniversityAachenGermany

Personalised recommendations