GPS Multipath Estimation with Improved SNR Adaptation Performance Utilizing Adaptive Filters

Abstract:

Global positioning system multipath estimation is important for both high precision positioning and reflection applications. The paper aims at proposing a method for estimating multipath parameters including carrier phases with good SNR adaptation performance utilizing adaptive filters. The method takes the signal after demodulation and spectrum dispreading for the desired signal. It is found to have a desired signal with relatively higher SNR so that the filtering performance is relatively better than previously proposed method; whats more, the method could estimate multipath code delay preferable to carrier phase ambiguity problem. Simulations validate the method can estimate multipath profile including amplitudes, code delay and carrier phases of direct path and multipath signals with small errors of 2% correct amplitude, smaller than one sampling interval code delay and 0.01 cycles carrier phase at 11dB SNR. The multipath mitigation performance of the method is better than that of narrow correlator.

• Periodical: Advanced Materials Research (Volumes 774-776)
• Pages: 1664-1670
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.774-776.1664
• Online since: September 2013
• Authors: Yan Xin Yao, Yun Zhao, Jun Ye Zeng
• Keywords: Adaptive Filters, Index Terms - Global Positioning System (GPS), Multipath Channels, Recursive Least-Squares, Signal-to-Noise Ratio (SNR)

References

[1] T. Yoshihara, et al: A study on detection of sea level variation using GPS signal reflected by sea surface. in Proc: Int. Tech. Meeting ION, p.217–223. (2006).

[2] P. C. Ching and H. C. So: Two Adaptive Algorithms for Multipath Time Delay Estimation. IEEE J. Ocean. Eng, vol. 19, no. 3, p.458– 463, Jul. (1994).

DOI: 10.1109/48.312922

[3] H. C. So and P. C. Ching: A generalized equalization based algorithm for multipath time delay estimation. in Proc: Rec. IEEE int. Sym. Circ. Syst. vol. 2, p.556– 559. (1996).

[4] M. Rlinami, H. Morikawa, T. Aoyama: An adaptive multipath mitigation technique for GPS signal reception. in Conf: Veh. Tech. vol. 2, pp.1625-1629. (2000).

DOI: 10.1109/vetecs.2000.851402

[5] Yao Yanxin, Yang Dongkai, Zhang Qishan: GPS multipath signal estimation method utilizing adaptive filtering. Acta Aeronautica et Astronautica Sinica, 31(10): 2004-2009. (2010).

[6] S. Haykin, Adaptive Filter Theory. 4th ed, China, Beijing: Electronic industry Press, p.183–296. (2003).

[7] James Bao-Yen Tsui, Fundamentals of Global Positioning System Receivers: A Software Approach, John Wiley & Sons, Inc. Print Electronic. (2000).

[8] Interface Control Document, ICD-GPS-200C, Revision C. (1991).