Modeling of intensified high dynamic star tracker

Area of Science:

• Spacecraft attitude determination
• Photoelectric instrumentation
• Quantum imaging

Background:

• Traditional star trackers face limitations in high angular velocity scenarios.
• Intensified High Dynamic Star Trackers (IHDST) enhance sensitivity using image intensifiers.
• Achieving high dynamic performance is critical for modern spacecraft.

Purpose of the Study:

• To establish a comprehensive quantum transfer model for IHDST.
• To analyze the centroiding accuracy and dynamic performance of IHDST.
• To develop an optimizing strategy for IHDST working parameters.

Main Methods:

• Development of a quantum transfer model based on stochastic process theory.
• Incorporation of two-dimensional Lorentz functions to model spatial spreading.
• Integration of quantum transfer and spatial spreading for a complete imaging model.
• Analysis of centroiding accuracy using the developed model.

Main Results:

• Accurate probability distribution of the output quantum number.
• A complete star imaging model for IHDST.
• Detailed analysis of centroiding accuracy.
• Identification of working parameters for optimization.

Conclusions:

• The developed model accurately describes IHDST imaging.
• The model enables detailed analysis of centroiding accuracy and dynamic performance.
• An optimizing strategy can enhance IHDST accuracy and dynamic capabilities.
• Experimental validation supports the model's effectiveness.