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A Star Sensor On-Orbit Calibration Method Based on Singular Value Decomposition.

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Summary
This summary is machine-generated.

A new singular value decomposition (SVD) method for star sensor calibration offers reduced computational cost. This method is suitable for star sensors with limited computing resources, achieving similar accuracy and convergence speed to traditional methods.

Keywords:
calibrationextended Kalman filteron-orbitsingular-value decompositionstar sensor

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Area of Science:

  • Aerospace Engineering
  • Optical Engineering
  • Computational Mathematics

Background:

  • Star sensor navigation accuracy relies on real-time optical parameter estimation.
  • Current on-orbit calibration methods primarily use inter-star angular distances.
  • Novel calibration references are needed for improved star sensor performance.

Purpose of the Study:

  • Introduce and investigate an on-orbit calibration method for star sensors using singular values.
  • Propose a singular-value decomposition (SVD) based calibration approach.
  • Explore optimal star combinations and singular value selection for calibration.

Main Methods:

  • Presented the camera model of the star sensor.
  • Developed an on-orbit calibration method leveraging the invariance of singular values under coordinate transformation.
  • Utilized observability analysis to determine optimal star combinations for calibration.
  • Discussed singular value selection based on the physical interpretation of the SVD of the star vector matrix.

Main Results:

  • Simulations demonstrated that the SVD method achieves comparable accuracy and convergence speed to the angular distance-based method.
  • The SVD method significantly reduces computational cost.
  • Field experiments verified the feasibility and effectiveness of the SVD method.

Conclusions:

  • The SVD method is a viable and efficient approach for on-orbit star sensor calibration.
  • This method is particularly advantageous for star sensors with limited computational capabilities.
  • The SVD method offers a promising alternative for enhancing star sensor performance and reliability.