质子辐照下动态星敏感器质心定位

打开文本图片集

Centroid localization of dynamic star sensors under protonirradiation

Abstract： To achieve precise centroid localization in dynamic star images subjected to proton irradiation，a deep learning-based algorithm is proposed.A keypoint model forthe centroids of streaked star spots is first established，folowed by the construction of a star centroid keypoint detection network based on this model.The energy degradation behavior of dynamic star images and the effects of proton irradiation are considered，and a star image dataset is generated by integrating proton cumulative iradiation and transient experiments.This dataset，supplemented with actual irradiated dynamic star images，is employed to train and validate the keypoint detection network. The localization accuracy of the network is subsequently compared with conventional restoration-based methods.Validation on simulated non-irradiated star images demonstrates that，within an angular velocity range of O （∘）/s to7 ，the centroid localization error ranges between O.O3 and O.2 pixel， surpassing restoration-based methods by approximately an order of magnitude. For actual irradiated dynamic star images with angular velocities between 2.5（∘）/s and （204号 10（∘）/s ，the localization error varies from O.4 to 1.8 pixel. Furthermore，the proposed method effectively addresses challnging scenarios where traditional methods falter，such as distinguishing star spots from transient bright spots and resolving overlapping star streaks.The algorithm exhibits robust performance against radiation noise and high-dynamic interference，ofering a novel solution for the application of star sensors in complex environments.

Key words： star sensor; dynamic; centroid localization; proton; subpixel; neural network

1引言

星敏感器是一种以恒星为观测对象的高精度姿态测量仪器，具有精度高、质量轻、功耗低、工作方式多样等优点，被认为是稳定条件下最精确的姿态测量装置之一[]。（剩余26459字）