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A hybrid method for accurate star tracking using star sensor and gyros.

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This study introduces a hybrid star tracking method combining star sensors and gyroscopes for improved aircraft navigation accuracy. The hybrid approach enhances star position prediction under varying dynamic conditions.

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Area of Science:

  • Aerospace Engineering
  • Navigation Systems
  • Sensor Fusion

Background:

  • Star tracking is the primary mode for star sensors, crucial for accurate navigation.
  • Existing methods face challenges in maintaining accuracy under dynamic conditions.
  • Improving tracking efficiency and precision in aircraft navigation is essential.

Purpose of the Study:

  • To propose and validate a hybrid method for enhanced star tracking accuracy and efficiency.
  • To integrate star sensors and gyroscopes for robust performance across dynamic flight conditions.
  • To improve star position prediction for autonomous navigation systems.

Main Methods:

  • A hybrid method combining star sensors and gyroscopes is developed.
  • Aircraft dynamic conditions are assessed using estimated angular acceleration.
  • Low-dynamic conditions utilize star sensor vector measurements for angular velocity estimation.
  • High-dynamic conditions rely on calibrated gyros for angular velocity acquisition.
  • Star position prediction is performed using estimated angular velocity and calibrated gyros.

Main Results:

  • Semi-physical experiments confirm the hybrid method's accuracy and feasibility.
  • The hybrid method demonstrates superior star position prediction compared to vector difference and gyro-assisted methods.
  • Enhanced accuracy is validated across different dynamic scenarios with simulated star centroid noise.

Conclusions:

  • The proposed hybrid star tracking method offers significant improvements in accuracy and efficiency.
  • This approach provides a robust solution for aircraft navigation under diverse dynamic conditions.
  • The validated performance highlights the potential for advanced autonomous navigation systems.