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An Adaptive Multipath Mitigation Filter for GNSS Applications


Global navigation satellite system (GNSS) is designed to serve both civilian and military applications. However, the GNSS performance suffers from several errors, such as ionosphere delay, troposphere delay, ephemeris error, and receiver noise and multipath. Among these errors, the multipath is one of the most unpredictable error sources in high-accuracy navigation. This paper applies a modified adaptive filter to reduce code and carrier multipath errors in GPS. The filter employs a tap-delay line with an Adaline network to estimate the direction and the delayed-signal parameters. Then, the multipath effect is mitigated by subtracting the estimated multipath effects from the processed correlation function. The hardware complexity of the method is also compared with other existing methods. Simulation results show that the proposed method using field data has a significant reduction in multipath error especially in short-delay multipath scenarios.

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Correspondence to Jyh-Ching Juang.

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Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Chang, CL., Juang, JC. An Adaptive Multipath Mitigation Filter for GNSS Applications. EURASIP J. Adv. Signal Process. 2008, 214815 (2008).

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  • Global Navigation Satellite System
  • Global Navigation Satellite System
  • Adaptive Filter
  • Ionosphere Delay
  • Hardware Complexity