Journal of Institute of Control, Robotics and Systems (제어로봇시스템학회논문지)

Institute of Control, Robotics and Systems (제어로봇시스템학회)
권호 표지
DOI QR코드

DOI QR Code

An Efficient Assisted-GPS Acquisition Method in Weak Signal Environment

약 신호 환경에서 효율적인 A-GPS 초기동기 방법

  • 박상현 (충남대학교 BK21정보통신인력양성사업단) ;
  • 이상정 (충남대학교 공과대학 전기정보통신공학부)
  • Published : 2004.01.01
Download PDF
⟨ Previous Next ⟩

Abstract

For sensitivity enhancement, the general assisted-GPS acquisition method adopts not only the coherent accumulation technique but also the non-coherent accumulation technique since the long coherent accumulation period increases the number of frequency search cells. But the non-coherent accumulation technique causes tile squaring loss, which is a dominant factor among the acquisition losses of assisted GPS dealing with weak GPS signals. This paper derives the squaring loss of the previous assisted-GPS acquisition method and proposes an assisted-GPS acquisition method for solving the problem of squaring loss in weak signal environment. In this paper, it is explained that the proposed assisted-GPS acquisition method prevents the squaring loss using a coupled coherent accumulation technique and the number of search cells of the proposed assisted-GPS acquisition method is much smaller than that of the previous assisted-GPS acquisition method. Finally, through the simulation by the GPS simulator, the acquisition success rate of the proposed assisted-GPS acquisition method is compared with that of the previous assisted-GPS acquisition method and the acquisition improvements are shown in weak signal environment.

Keywords

References

  1. J. J. Caffery and G. L. Stuber, 'Overview of radiolocation in CDMA cellular systems', IEEE Communication Magazine, vol. 46, no, 4, pp. 38-45, April 1998 https://doi.org/10.1109/35.667411
  2. G. M Djuknic and R. E .Richton, 'Geolocation and assisted GPS', Computer, vol. 34, no. 2, pp. 123-125, February 2001 https://doi.org/10.1109/2.901174
  3. T. Haddrell and A. R. Pratt, 'Understanding the indoor GPS signal', in Proceedings of the 14th International Technical Meeting of the Satellite Division of the Institute of Navigation, pp. 1487-1499, 11-14 September 2001
  4. N. F. Krasner, Fast acquisition high sensitivity GPS receiver, US Pstent 6289041 B1, Patent and Trademark Office, Washington D.C., 1998
  5. S. Soliman, S. Glazko, and P. Agashe, 'GPS receiver sensitivity enhancement in wireless applications', Proceedings of 1999 IEEE MTT-S Symposium, pp. 181-186, 21-24 February 1999 https://doi.org/10.1109/MTTTWA.1999.755159
  6. M. M. Chansarker and L. Garin, 'Asquisition of GPS signals at very low signal to noise ratio', Proceeding of the ION 2000 National Technical Meeting, pp. 731-737, 26-28 January 2000
  7. J.-C. Lin, 'Differentially coherent PN code acquisition with full-period correlation in chip-synchronous DS/SS receivers', IEEE Transactions on Communications, vol. 50, no. 5, pp. 698-702, May 2002 https://doi.org/10.1109/TCOMM.2002.1006549
  8. TR45, Position deternination service standard for dual mode spread systems, TIA/EIA/IS-801, October 15, 1999
  9. R. N. McDonough and A. D. Whalen, 'Detection of signals in noise, New York: Acadermic Press, 1995
  10. R. L. Peterson et. al., Introduction to spread spectrum communications, Prentice-Hall, Inc., 1995
  11. Detection of signals in noise R.N.McDonough;A.D.Whalen
  12. Introduction to spread spectrum communications R.L.Peterson(et. al.)

Cited by

  1. Performance Analysis of Assisted-Galileo Signal Acquisition Under Weak Signal Environment vol.19, pp.7, 2013, https://doi.org/10.5302/J.ICROS.2013.12.1813