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A New Method for Single-Epoch Ambiguity Resolution with Indoor Pseudolite Positioning.

Xin Li1,2, Peng Zhang3,4, Jiming Guo5,6

  • 1School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China. whuxin@hotmail.com.

Sensors (Basel, Switzerland)
|April 22, 2017
PubMed
Summary

This study introduces a new ambiguity resolution method for indoor pseudolite positioning. The improved particle swarm optimization enhances computational efficiency, enabling centimeter-level precision with low-cost receivers.

Keywords:
ambiguity function methodambiguity resolutionimproved particle swarm optimizationpseudolite positioning

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Area of Science:

  • GNSS (Global Navigation Satellite System) and Positioning Technology

Background:

  • High-precision indoor positioning is essential for various applications.
  • Traditional pseudolite positioning systems face challenges like signal interruption and geometric invariance.
  • Ambiguity resolution (AR) is critical for achieving high accuracy in these systems.

Purpose of the Study:

  • To propose a novel, efficient, and reliable ambiguity resolution method for indoor pseudolite positioning.
  • To address the computational inefficiency of conventional Ambiguity Function Method (AFM).
  • To achieve centimeter-level positioning accuracy using low-cost receivers.

Main Methods:

  • Development of a new single-epoch, nonlinear AR method based on the Ambiguity Function Method (AFM).
  • Integration of an Improved Particle Swarm Optimization (IPSO) algorithm for efficient solution searching.
  • Application of least squares adjustment variances for reliable ambiguity solving.

Main Results:

  • The IPSO algorithm significantly enhanced the computational efficiency of AFM.
  • IPSO demonstrated a more elaborate search ability compared to grid searching.
  • The proposed AFM method achieved good performance in static and kinematic tests.
  • Centimeter-level positioning accuracy was attained with a low-cost single-frequency software receiver.

Conclusions:

  • The proposed AR method effectively improves computational efficiency and search ability for indoor pseudolite positioning.
  • This approach enables centimeter-level precision positioning, even with initial approximate coordinate precision better than 0.2 m.
  • The method is well-suited for low-cost, single-frequency software receivers in indoor environments.