天文导航中短波红外星表交叉证认与优化

doi:10.3969/j.issn.1000-1093.2021.11.010

摘要/Abstract

摘要： 在短波红外波段进行昼夜连续测星有望实现近地空间全天时天文导航，现有的2 μm巡天计划（2MASS）、大视场红外搜寻探测器等红外星表不仅缺少天文导航所必需的恒星自行等信息，而且恒星分布极不均匀，无法直接应用于天文定位定向。在对当前主要星表特点进行分析的基础上，将2MASS红外星表与可见光Tycho-2星表进行交叉证认，得到包含恒星自行等完整信息的短波红外星表；利用似均匀星表划分法对交叉证认后的星表进行特点规律分析，并通过“角距+星等”加权筛选法对其进行优化，获得平均恒星分布密度0.5颗每平方度、全天区变异系数为0.14的短波红外星表。优化后的星表满足一等天文测量精度要求，恒星分布均匀，可为昼夜连续天文导航提供红外星表基础。

关键词: 天文导航, 短波红外星表, 2MASS星表, 交叉证认, 天区划分

Abstract: Continuous day and night star surveys in the short-wave infrared band are expected to realize all-time celestial navigation in near-earth space，which is of great significance for improving the usability and continuity of celestial navigation systems.A short-wave infrared star catalogue with complete information is an essential foundation for all-sky celestial navigation. Since there is a lack of the information about the motion of stars necessary for celestial navigation and the extremely uneven distribution of stars, the existing infrared star catalogues，such as two micron all sky survey (2MASS) and wide-field infrared survey explorer, cannot be directly applied to astronomical positioning and orientation. Based on the analysis of the current main star catalogues，2MASS infrared star catalogue and the visible light Tycho-2 catalogue are certified and a short-wave infrared star catalogue containing complete information of the stars themselves is presented.Then the quasi-uniform star catalogue division method is used to analyze the characteristics of the cross-validated star catalogue. The star catalogue is optimized using the “angle distance + magnitude” weighted screening method. The short-wave infrared star catalogue is obtained with an average star distribution density of 0.5 stars per square degree and a coefficient of variation of 0.14 throughout the sky.

Key words: celestialnavigation, short-waveinfraredstarcatalogue, 2MASScatalogue, cross-validation, pixelizationofsphere

中图分类号:

P128.4

张耿，李崇辉，张超，杜兴圳，刘长昊. 天文导航中短波红外星表交叉证认与优化[J]. 兵工学报, 2021, 42(11): 2368-2378.

ZHANG Geng， LI Chonghui， ZHANG Chao， DU Xingzhen， LIU Changhao. Cross-validation and Optimization of SWIR Star Catalogue in Celestial Navigation[J]. Acta Armamentarii, 2021, 42(11): 2368-2378.

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