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A New Method of High-Precision Positioning for an Indoor Pseudolite without Using the Known Point Initialization.

Yinzhi Zhao1,2,3, Peng Zhang4,5,6, Jiming Guo7,8,9

  • 1School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China. yz_zhao_gnss@163.com.

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Summary
This summary is machine-generated.

This study introduces a new indoor pseudolite positioning method that bypasses known point initialization (KPI). It achieves high-precision positioning by combining the static differential pseudolite system (DPL) and ambiguity function method (AFM) for rapid, accurate initial coordinate determination.

Keywords:
LAMBDA methodambiguity function methoddifferential pseudolite systempseudolite differential positioning

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Area of Science:

  • GNSS (Global Navigation Satellite System) and indoor positioning technologies.
  • Signal processing and estimation algorithms for high-precision localization.

Background:

  • Traditional indoor pseudolite positioning relies on Known Point Initialization (KPI) and the LAMBDA method for ambiguity resolution.
  • Pseudorange errors from multipath, noise, and clock issues necessitate robust positioning techniques.
  • Existing methods can be computationally intensive or require specific initialization procedures.

Purpose of the Study:

  • To develop a novel, high-precision indoor pseudolite positioning method that eliminates the need for KPI.
  • To achieve rapid and accurate initial coordinate estimation for effective ambiguity resolution.
  • To enhance the efficiency and accuracy of indoor localization systems.

Main Methods:

  • Utilizing the static differential pseudolite system (DPL) for initial low-accuracy coordinate acquisition.
  • Employing the ambiguity function method (AFM) to refine coordinates and meet LAMBDA's accuracy requirements.
  • Integrating AFM results as initial values for the LAMBDA method to fix carrier phase ambiguities.

Main Results:

  • The DPL method achieved decimeter-level accuracy for initial coordinates.
  • The AFM, with optimized search parameters, provided centimeter-level precision and high efficiency.
  • The combined method successfully fixed double-difference carrier phase ambiguities.
  • Experimental results demonstrated centimeter-level accuracy for dynamic tests and millimeter-level for static tests.

Conclusions:

  • The proposed KPI-free method effectively enables high-precision indoor pseudolite positioning.
  • The integration of DPL and AFM offers a robust solution for rapid and accurate initial positioning.
  • This approach significantly improves ambiguity resolution and overall positioning performance in challenging indoor environments.