多星敏感器协同观测的短弧关联算法

doi:10.19665/j.issn1001-2400.2021.04.009

Abstract

Abstract:

The star sensor is a high-precision attitude sensor with the ability to shoot space targets intermittently.It can be used as a new type of space target monitoring platform.Accurately associating the track segments of the star sensor with intermittent observations is the prerequisite for precise orbit determination of space targets.In order to solve the problem of trajectory association where the initial orbit cannot be determined because the target observation time is too short,a short arc association algorithm for space targets based on hypothetical boundary values is proposed.By using the multi-satellite sensor joint positioning method,only the angle measurement data of the star sensor are converted into the spatial coordinates of the target,and each point from the track segment to be associated is taken as a boundary.Based on the boundary association hypothesis,the theoretical values of the space target orbit under all assumed boundary conditions are calculated.The Mahalanobis distance and chi-square test are used to make related judgments.The algorithm in this paper can better adapt to many-to-many track association,and can reject uncorrelated tracks more accurately.After simulation,the algorithm in this paper is superior to the short arc correlation method based on the admissible region to determine the initial orbit and sine fitting in terms of association accuracy and execution time.

Key words: boundary value orbit determination, target association, track segment, star sensor, short-arc association

CLC Number:

V443+.5

HUANG Qiushi,ZHANG Yasheng,FENG Fei. Short-arc association algorithm for joint observation of multiple star sensors[J].Journal of Xidian University, 2021, 48(4): 64-72.

Figures/Tables 12

References 18

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噪声标准差	σ_x/km	σ_y/km	σ_z/km	位置标量/km
1″,100 m	0.573 2	0.875 7	0.131 5	1.054 8
2″,100 m	1.031 7	1.663 8	0.276 1	1.977 1
2″,1 000 m	1.679 6	2.151 7	0.480 2	2.771 5

间隔时间/h	相关目标	不相关目标	TP	TN	FP	FN
1	132	68	131	68	0	1
2	167	33	165	33	0	2
5	145	55	140	54	1	5
10	129	71	121	69	2	8

Short-arc association algorithm for joint observation of multiple star sensors

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References 18

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