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High-Precision Automatic Calibration Modeling of Point Light Source Tracking Systems.

Ruijin Li1,2, Liming Zhang1, Xianhua Wang1

  • 1Key Laboratory of Optical Calibration and Characterization, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.

Sensors (Basel, Switzerland)
|April 3, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a novel point light source tracking system for precise, high-frequency satellite calibration. The system achieves high accuracy in mirror arrays, enabling reliable on-orbit radiometric calibration and modulation transfer function detection.

Keywords:
geometric errorhigh-precision calibrationmodelingradiometric calibration

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Area of Science:

  • Optics and Photonics
  • Aerospace Engineering
  • Satellite Technology

Background:

  • Automated calibration and detection are crucial for high-precision, high-frequency satellite operations.
  • Mirror arrays require automatic direction adjustment for unattended site calibration.

Purpose of the Study:

  • To propose a high-precision automatic calibration model for mirror arrays using a novel point light source tracking system.
  • To enable high-resolution, high-precision, and high-frequency on-orbit satellite radiometric calibration and modulation transfer function detection.

Main Methods:

  • A camera observes the solar vector, establishing an observation equation linking image and local coordinate systems.
  • Geometric error calculation using multipoint observation data for system calibration.
  • Model error analysis and solar tracking verification experiments.

Main Results:

  • Standard deviations for pitch and azimuth angle errors are 0.0176° and 0.0305°.
  • Root mean square errors for image centroid contrast are 2.0995 (x-axis) and 0.8689 (y-axis) pixels.
  • Pixel angular resolution errors are 0.0377° (x-axis) and 0.0144° (y-axis), with a comprehensive angle resolution error of 0.0403°.

Conclusions:

  • The proposed model demonstrates consistency between calculated and measured data, validating its accuracy.
  • The point light source tracking system meets the stringent requirements for on-orbit satellite calibration and detection.
  • This technology supports advanced satellite monitoring and performance assessment.