CAJ | 학술논문

星敏感器是高精度的航天器姿态测量器件,其性能受太空温度环境的影响.运用有限元法和光线追迹法,建立星敏感器光学系统的热/结构/光分析模型,研究光学系统温度分布与星敏感器测量误差的关系,得到了算例光学系统在温度均匀分布条件下的温度变化以及轴向温度梯度变化、侧向温度梯度变化与星敏感器测量误差的关系曲线;给出了算例光学系统热误差小于角秒量级的温度条件:均匀温度分布条件下温度变化量≤10℃、轴向温度梯度≤0.1310℃/mm、侧向温度梯度≤0.0325℃/mm,为高精度星敏感器光学系统热控制提供科学的依据.
성민감기시고정도적항천기자태측량기건,기성능수태공온도배경적영향.운용유한원법화광선추적법,건립성민감기광학계통적열/결구/광분석모형,연구광학계통온도분포여성민감기측량오차적관계,득도료산례광학계통재온도균균분포조건하적온도변화이급축향온도제도변화、측향온도제도변화여성민감기측량오차적관계곡선;급출료산례광학계통열오차소우각초량급적온도조건:균균온도분포조건하온도변화량≤10℃、축향온도제도≤0.1310℃/mm、측향온도제도≤0.0325℃/mm,위고정도성민감기광학계통열공제제공과학적의거.
Star sensor is a high accurate attitude measuring instrument used in various spacecrafts, and its accuracy is restricted by ambient temperature of outer space. This paper described an effective scheme to the Thermal/Structural/Optical Analysis in optical system of star sensor. By finite element analysis (FEA) and ray tracing, the relationship of star sensor's measurement error and optical system's temperature distribution was studied. The error characteristics of a star sensor had been researched, when the temperature gradient of optical system were zero, axial and lateral respectively. Based on this scheme, optical system's temperature conditions can be achieved under the required measurement error caused by thermal effect of optical system. For example, if the required error is less than arcsecond level, the uniform temperature change, the axial temperature gradient and lateral temperature gradient must be less than 10℃, 0.1310℃/mm and 0.0325℃/mm respectively. It provides scientific references in thermal control design of optical system of star sensor.