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A Decoupled Doppler Positioning Algorithm for Dynamic Receivers Using LEO Constellation Signals.

Tianqi Liu1,2, Yan Liu3,4, Chenggan Wen2

  • 1School of Physics and Microelectronics, Hunan University, Changsha 410082, China.

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Summary

This study introduces a new Doppler positioning algorithm for low-earth-orbit (LEO) constellations. The method achieves meter-level accuracy for dynamic receivers, even with unknown initial states, enabling robust navigation.

Keywords:
LEO satellitesLS methoddynamic Doppler positioningvelocity measurementzero initial value

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Area of Science:

  • Navigation Systems
  • Signal Processing
  • Aerospace Engineering

Background:

  • Low-Earth-Orbit (LEO) constellations are increasing, driving demand for advanced positioning techniques.
  • Conventional Doppler positioning faces challenges with dynamic receivers and unknown initial states due to nonlinear observation models.

Purpose of the Study:

  • To develop an improved Doppler-based positioning algorithm for LEO communication constellations.
  • To overcome the limitations of existing algorithms in dynamic scenarios with unknown initial states.

Main Methods:

  • A novel least-squares-based algorithm is proposed.
  • The algorithm decouples the estimation of position and velocity for robust performance.
  • It enables positioning from a zero initial state, simplifying initialization.

Main Results:

  • Achieved meter-level positioning accuracy.
  • Demonstrated decimeter-per-second velocity accuracy.
  • Validated performance across various dynamic scenarios, including high-speed motion.

Conclusions:

  • The proposed method offers a viable solution for real-time navigation in challenging environments.
  • It effectively utilizes LEO signals for positioning, especially where Global Navigation Satellite Systems (GNSS) are unreliable.
  • Establishes a robust framework for dynamic positioning using Doppler measurements.