A New Approach to Determine the Controid of Star Spot for Star Tracker Based on MEMS-Gyro

摘要：

　　Along with the development of MEMS technology,the precision of MEMS-Gyro is increasing and the range of application of MEMS-Gyro is expanding.The accuracy of centroid determination of the spot directly relates to the precision of star tracker,but,when the exposure time is shorter or the satellite is in an unstable state,the noise of detector limits the accuracy greatly in the traditional approach of centroid determination.In view of these issues,this paper presents an approach which is based on high-precision MEMS-Gyro to determine the centroid of spot.This approach references EKF to estimate the position of centroid optimally.So,when the SNR is reduced because of shorter exposure and unstable state,this approach can help to increase the accuracy of centroid determination by introducing MEMS-Gyro.Further,it improves the precision and dynamic performance of the star tracker.In the end of this article,the feasibility of the approach is verified by the numerical simulation.

关键词： MEMS-Gyro Star Tracker EKF Centroid Method Precision Dynamic Performance

作者: Chen Nan Xing Fei You Zheng

作者单位: Department of Precision Instruments and Mechanology, Tsinghua University,Beijing, China;State Key Laboratory of Precision Measurement Technology and Instruments, Beijing, China

会议类型: 国际会议

会议名称: 中国微米纳米技术学会第14届学术年会、第3届国际年会暨第6届微米纳米技术“创新与产业化国际研讨与展览会(CSMNT2012 & ICMAN2012)

会议地点: 杭州

会议语种:英文

页码: 1-7

在线出版日期: 2012-11-04（万方平台首次上网日期，不代表论文的发表时间）