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Mitigating Multipath Bias Using a Dual-Polarization Antenna: Theoretical Performance, Algorithm Design, and

Lin Xie1, Xiaowei Cui2, Sihao Zhao3

  • 1Department of Electronic Engineering, Tsinghua University, Beijing 100084, China. xie_lin@foxmail.com.

Sensors (Basel, Switzerland)
|February 18, 2017
PubMed
Summary
This summary is machine-generated.

Dual-polarization antennas enhance Global Navigation Satellite System (GNSS) receivers by distinguishing line-of-sight signals. This study analyzes their effectiveness, especially for short-delay multipath errors, and proposes a new algorithm for improved positioning accuracy.

Keywords:
LHCPMLEdual-polarizationshort delay multipath

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Area of Science:

  • Satellite Navigation Systems
  • Signal Processing
  • Antenna Theory

Background:

  • Multipath effect significantly degrades Global Navigation Satellite System (GNSS) receiver positioning accuracy.
  • Dual-polarization antennas offer a promising approach for multipath mitigation by providing an additional degree of freedom.
  • Existing dual-polarization multipath mitigation (DPMM) techniques show performance improvements but lack analysis on their effectiveness conditions.

Purpose of the Study:

  • To analyze the theoretical performance of DPMM under various received signal conditions.
  • To determine the conditions under which dual-polarization antennas outperform single-polarization antennas for multipath mitigation.
  • To propose an effective DPMM algorithm based on the analysis.

Main Methods:

  • Analysis of signal characteristics received by a dual-polarization antenna.
  • Maximum Likelihood Estimation (MLE) to assess theoretical DPMM performance.
  • Development and simulation of a dual-polarization sequential iterative maximum likelihood estimation (DP-SIMLE) algorithm.

Main Results:

  • Dual-polarization antennas are particularly effective in mitigating short-delay multipath, a challenging error source.
  • The study identifies specific conditions favoring DPMM over traditional single-polarization methods.
  • Simulations confirm the superior performance of the proposed DP-SIMLE algorithm compared to existing techniques.

Conclusions:

  • Dual-polarization antennas provide a valuable degree of freedom for advanced multipath mitigation in GNSS.
  • Understanding the conditions for DPMM effectiveness is crucial for algorithm design and optimal performance.
  • The proposed DP-SIMLE algorithm demonstrates significant improvements in GNSS positioning accuracy, especially in challenging multipath environments.