Preliminary results of centroiding experiment for the STEP mission

	Preliminary results of centroiding experiment for the STEP mission
	Li, Haitao; Li, Baoquan; Cao, Yang; Chen, Ding; Li, Ligang
	2015
会议名称	International Conference on Optical Instruments and Technology - Optoelectronic Imaging and Processing Technology
会议日期	MAY 17-19, 2015
会议地点	Beijing, PEOPLES R CHINA
关键词	STEP exoplanets centroiding linear corrected photon weighted means Gauss fitting
页码	96221A
通讯作者	Li, HT (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, Beijing, Peoples R China.
英文摘要	Search for Terrestrial Exo-Planet (STEP)[1] was originally proposed in 2013 by the National Space Science Center, Chinese Academy of Sciences, which is currently being under background engineering study phase in China. The STEP mission is a space astrometry telescope working at visible light wavelengths. The STEP aims at the nearby terrestrial planets detection through micro-arcsecond-level astrometry. Determination of the separation between star images on a detector with high precision is very important for astrometric exoplanets detection through the observation of star wobbles due to planets. The requirement of centroiding accuracy for STEP is 1e-5 pixel. A centroiding experiment have been carried out on a metrology testbed in open laboratory. In this paper, we present the preliminary results of determining the separations between star images. Without calibration of pixel positions and intra-pixel response, we have demonstrated that the standard deviation of differential centroiding is below 7.4e-3 pixel by the algorithm of linear corrected photon weighted means(LCPWM)[2,3]. For comparison, the photon weighted means(PWM) and Gauss fitting are also used in the data reduction. These results pave the way for the geometrical calibration and the intra-pixel quantum efficiency(QE) calibration of detector array equipment for micro-pixel accuracy centroiding.
收录类别	CPCI
会议主办者	China Instrument & Control Soc, SPIE
会议录	2015 INTERNATIONAL CONFERENCE ON OPTICAL INSTRUMENTS AND TECHNOLOGY: OPTOELECTRONIC IMAGING AND PROCESSING TECHNOLOGY
会议录出版者	SPIE-INT SOC OPTICAL ENGINEERING
语种	英语
ISSN号	0277-786X
ISBN号	978-1-62841-803-3
内容类型	会议论文
源URL	[http://ir.nssc.ac.cn/handle/122/4551]
专题	国家空间科学中心_空间环境部
推荐引用方式 GB/T 7714	Li, Haitao,Li, Baoquan,Cao, Yang,et al. Preliminary results of centroiding experiment for the STEP mission[C]. 见:International Conference on Optical Instruments and Technology - Optoelectronic Imaging and Processing Technology. Beijing, PEOPLES R CHINA. MAY 17-19, 2015.