# Research on Star Sensor Imaging Simulation Under Near-Space Hypersonic Non-Equilibrium Flow Conditions

## TL;DR

This paper develops a simulation model to study how hypersonic non-equilibrium flow affects star sensor imaging in near-space environments.

## Contribution

A novel star sensor imaging simulation model is proposed to analyze thermochemical non-equilibrium flow effects.

## Key findings

- The radiation of solid media significantly impacts star sensor imaging.
- Detectable limit magnitudes under two conditions are 3.28 and 4.55.
- The model provides theoretical support for star sensor design and testing in hypersonic platforms.

## Abstract

In order to address the difficulty in acquiring degraded images for star sensors under hypersonic conditions, this paper proposes a star sensor imaging simulation model which can effectively analyze the influence of thermochemical non-equilibrium flow on the star sensor. Firstly, the two-temperature model is adopted to describe the relaxation phenomenon of hypersonic non-equilibrium flow, and the chemical reaction is simulated by Arrhenius law. Then, the effects of optical transmission and thermal radiation on star sensor imaging are quantitatively analyzed. Based on this degradation model, the degraded star images under two typical working conditions are simulated. The simulation results show that the radiation of the solid media has the most significant influence on the imaging of the star sensor. The detectable limit magnitudes of the star sensor obtained under the two working conditions are 3.28 and 4.55, respectively. The research results can provide important theory and technical support for the system design and algorithm testing of star sensors on near-space hypersonic platforms.