High accuracy star centroid acquisition method of airborne star sensor during daytime

摘要

This paper shows a novel high accuracy star centroid acquisition method for airborne star sensor. Different form aerospace application, airborne star sensor operate in the atmosphere, most of the visible stars are covered by sunlight during daytime. Besides, aero-optical effect and atmosphere refraction will affected the accuracy of star centroid. Therefore, a high accuracy acquisition method based gray morphology modified winner filtering are proposed, and the error caused by aero-optical effect and atmosphere are corrected. Firstly, the daytime star image are modeled in consideration of star radiation, sky background radiation, aero-optical effect and atmosphere refraction, then a novel star image filtering algorithm is proposed and the errors caused by aero-optical and atmosphere refraction are corrected. Finally, the proposed algorithm are analysis with simulated star image, compared with traditional algorithm, a much better signal-to-noise ratio is gained.