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Distributed Orbit Determination for Global Navigation Satellite System with Inter-Satellite Link.

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A new distributed algorithm for BeiDou navigation satellites (BDS-3) uses balanced Kalman filters for orbit determination. This method requires less computing power while maintaining good accuracy, improving autonomous navigation.

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balanced extended Kalman filterdistributed orbit determinationincreased measurement covariance extended Kalman filterinter-satellite linkiterative cascade extended Kalman filterwhole-constellation centralized extended Kalman filter

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Area of Science:

  • Satellite Technology
  • Orbital Mechanics
  • Navigation Systems

Background:

  • Global Navigation Satellite Systems (GNSS) require robust performance during extreme conditions.
  • The BeiDou system (BDS-3) utilizes Ka-band inter-satellite links for enhanced autonomous navigation and reduced ground station dependence.
  • Large data volumes from inter-satellite links necessitate distributed processing for orbit determination.

Purpose of the Study:

  • To propose a balanced extended Kalman filter algorithm for distributed orbit determination in satellite constellations.
  • To evaluate the performance of this distributed algorithm against centralized and other distributed methods.
  • To assess the trade-off between computational power and accuracy in distributed orbit determination.

Main Methods:

  • Development of a balanced extended Kalman filter algorithm for distributed orbit determination.
  • Comparison with centralized extended Kalman filter, iterative cascade extended Kalman filter, and increasing measurement covariance extended Kalman filter.
  • Simulation and analysis of orbit determination accuracy and computational load.

Main Results:

  • The proposed balanced extended Kalman filter algorithm demonstrates lower computational power requirements.
  • The distributed approach yields results with relatively good accuracy compared to other methods.
  • The algorithm effectively handles the large data volumes generated by inter-satellite links.

Conclusions:

  • Distributed orbit determination using the balanced extended Kalman filter is a viable approach for modern GNSS like BDS-3.
  • This method offers a practical solution for managing computational resources in satellite constellations.
  • The balanced extended Kalman filter provides an effective balance between accuracy and efficiency for autonomous navigation.