基于SVM的导航星表构造

Construction of Star Catlogue Based on SVM

导航恒星提取一般采用星等过滤方法MFM(Magnitude Filtering Method)。但是MFM方法存在两个明显的缺陷:若星等阈值太高,导航星表冗余度高;反之,导航星表出现视场(FOV)空洞。支持向量机SVM(Sup-port Vector Machine)作为一种可训练的机器学习方法,依靠小样本学习后的模型参数进行导航星提取,可以得到分布均匀且恒星数量大为减少的导航星表。利用SAO星表进行了实验,并对导航星表内恒星的分布情况作了统计。实验证明,SVM作为导航星提取算法具有很好的应用前景。

The method of constructing navigation star catalogue is always based on Magnitude Filtering Method （ MFM）. But it does not work well because of two typical disadvantages. On one hand it will extract so many stars that there is redundancy in the catalogue. And on the other hand it will generate ＂hole＂ in some area of celestial sphere. In this article, Support Vector Machine（SVM） is introduced into extracting navigation stars from basic catalogne. After using the new method on SAO catalogue, it is proved that taking SVM as the method of extracting navigation-stars has good prospection.