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Area of Science:

  • Navigation Systems Engineering
  • Geomatics Engineering
  • Signal Processing

Background:

  • Global Navigation Satellite System (GNSS) receivers face performance limitations in obstructed environments such as urban canyons, open-pit mines, and indoors.
  • Pseudolites offer a solution by providing supplementary navigation signals, thereby extending GNSS usability and improving receiver accuracy in these challenging locations.
  • Asynchronous pseudolite systems, operating independently, necessitate specialized integration strategies for effective Global Navigation Satellite System (GNSS) and pseudolite measurement fusion.

Purpose of the Study:

  • To develop and evaluate novel integration strategies for asynchronous pseudolite and Global Navigation Satellite System (GNSS) measurements.
  • To enhance the performance and reliability of navigation systems in environments where traditional GNSS signals are degraded or unavailable.
  • To explore the efficacy of combining pseudolite proximity and receiver signal strength (RSS)-based positioning with established integration approaches.

Main Methods:

  • Development of loosely-coupled and tightly-coupled integration strategies for asynchronous pseudolite/GNSS systems.
  • Incorporation of pseudolite proximity and Receiver Signal Strength (RSS)-based positioning techniques into the integration frameworks.
  • Performance evaluation through static and kinematic tests in diverse simulated and real-world challenging environments.

Main Results:

  • The proposed integration strategies effectively combine heterogeneous measurements from asynchronous pseudolites and Global Navigation Satellite System (GNSS).
  • Both loosely- and tightly-coupled approaches demonstrated successful integration, with performance varying based on specific environmental conditions and positioning methods used.
  • The developed methods proved robust in static and kinematic scenarios, showcasing significant improvements over standalone GNSS in difficult signal environments.

Conclusions:

  • The presented asynchronous pseudolite/Global Navigation Satellite System (GNSS) integration strategies are effective for improving navigation system performance.
  • These methods offer a viable solution for extending the operational capabilities of navigation receivers in signal-challenged areas.
  • The successful fusion of heterogeneous data sources highlights the potential for hybrid navigation systems in demanding applications.