A method for star extraction from daytime star maps with additional correction of eastern elongation

doi:10.11947/j.AGCS.2024.20230521

Abstract

Abstract:

The daytime star map is characterized by high background noise and low signal-to-noise ratio, which lowers the efficiency of traditional star extraction methods. Moreover, robustness of single frame extraction methods is poor due to the negative factors of daytime star map, including star energy weakness, noise sensitivity and star contour irregularity. Therefore, a star extraction method with modification of apparent motion is proposed for daytime infrared star map processing. With application of camera parameter conversion model, image coordinates of the target star were predicted using the data of station position, observation time and ephemeris. Further, relative displacements of the star in image sequence were precisely calculated using the exposure intervals, which led to precise register of the image superposition on star area, and finally resulted to accurate star extraction. Experimental results show that the success rate of star extraction with the proposed method can reach 100%, which is 163% higher than that of traditional algorithms. Meanwhile, the time consumption was reduced to 23%. Signal-to-noise ratio was also enhanced since the influence of random error was greatly reduced, and the centroid extraction accuracy was improved by 72% compared to single frame methods.

Key words: daytime star map, eastern elongation, star extraction, centroid accuracy, astro-geodetic surveying, multiframe overlay

CLC Number:

P222

Wanxiang GOU, Chonghui LI, Shuai TONG, Yong ZHENG, Yuan YANG, Zhixing CHEN, Yinhu ZHAN. A method for star extraction from daytime star maps with additional correction of eastern elongation[J]. Acta Geodaetica et Cartographica Sinica, 2024, 53(11): 2166-2177.

Figures/Tables 12

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系统参数	参数值
视场角大小	1°20′
通光口径/mm	40
光学透过率/（%）	56
等效焦距/mm	240
工作波段/nm	1500~1700
传感器型号	QHY990
量子响应效率/（%）	77
像元尺寸/μm	5.0
像元总数	1392×1052
暗电流/（像素/s）	≤227e-

采用方法	恒星编号	X坐标均值/像素	Y坐标均值/像素	均方差/像素	所用时间/ms	提取成功帧数	成功率/（%）
	HIP84345	83.04	141.40	0.57	2859	38	38
传统方法	HIP 80704	308.45	254.51	0.63	3043	7	14
	HIP 54061	—		—	2810	0	0
	HIP84345	82.55	141.32	0.43	438	100	100
位置预测法	HIP 80704	307.71	254.35	0.46	442	100	100
	HIP 54061	172.28	253.28	0.54	441	87	87
	HIP84345	82.57	141.14	0.12	656	100	100
本文方法	HIP 80704	307.58	254.26	0.11	681	100	100
	HIP 54061	172.41	253.22	0.15	652	100	100