Department of Computer Science and Engineering, Changchun University of Technology, Changchun 130012, China.
Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China.
Sensors (Basel). 2019 Mar 25;19(6):1457. doi: 10.3390/s19061457.
To realize the application of the star sensor in the all-day carrier platform, a three-field-of-view (three-FOV) star sensor in short-wave infrared (SWIR) band is considered. This new prototype employs new techniques that can improve the detection capability of the star sensor, when the huge size of star identification feature database becomes a big obstacle. Hence, a way to thin the guide star catalog for three-FOV daytime star sensor is studied. Firstly, an introduction of three-FOV star sensor and an example of three-FOV daytime star sensor with narrow FOV are presented. According to this model and the requirement of triangular star identification method, two constraints based on the number and the brightness of the stars in FOV are put forward for guide star selection. Then on the basis of these constraints, the improved spherical spiral method (ISSM) is proposed and the optimal number of reference points of ISSM is discussed. Finally, to demonstrate the performance of the ISSM, guide star catalogs are generated by ISSM, magnitude filter method (MFM), 1st order self-organizing guide star selection method (1st-SOPM) and the spherical spiral method (SSM), respectively. The results show that the guide star catalog generated by ISSM has the smallest size and the number and brightness characteristics of its guide stars are better than the other methods. ISSM is effective for the guide star selection in the three-FOV daytime star sensor.
为了实现星敏感器在全天候载体平台上的应用，考虑了一种工作在短波红外（SWIR）波段的三视场（three-FOV）星敏感器。这种新的原型采用了新技术，可以提高星敏感器的探测能力，而庞大的星识别特征数据库则成为一个大障碍。因此，研究了一种用于三视场白天星敏感器的稀疏导星星表的方法。首先，介绍了三视场星敏感器，并给出了一个窄视场三视场白天星敏感器的实例。根据该模型和三角星识别方法的要求，提出了两个基于视场中星星数量和亮度的约束条件，用于导星选择。然后在此基础上，提出了改进的球面螺旋法（ISSM），并讨论了 ISSM 的最佳参考点数。最后，为了验证 ISSM 的性能，分别用 ISSM、星等过滤法（MFM）、一阶自组织导星选择法（1st-SOPM）和球面螺旋法（SSM）生成导星星表。结果表明，ISSM 生成的导星星表最小，其导星星的数量和亮度特征优于其他方法。ISSM 对三视场白天星敏感器的导星选择是有效的。
