Acta Optica Sinica, Volume. 45, Issue 12, 1228002(2025)
Analysis of Star Sensor In-Orbit Accuracy
Figures & Tables(14)
Fig. 1. Characteristics of angle between optical axes of star sensors 1 and 2. (a) Optical axis angle between star sensors 1 and 2; (b) thermal stability error of optical axis angle between star sensors 1 and 2; (c) optical axis angle error between star sensors 1 and 2
Fig. 2. Low frequency error and noise equivalent angle between sensors 1 and 2. (a) Low frequency error of field of view period between star sensors 1 and 2; (b) noise equivalent angle between star sensors 1 and 2
Fig. 3. Characteristics of angle between optical axes of star sensors 3 and 4. (a) Optical axis angle between star sensors 3 and 4; (b) thermal stability error of optical axis angle between star sensors 3 and 4; (c) optical axis angle error between star sensors 3 and 4
Fig. 4. Low frequency error and noise equivalent angle between sensors 3 and 4. (a) Low frequency error of field of view period between star sensors 3 and 4; (b) noise equivalent angle between star sensors 3 and 4
Fig. 5. Noise equivalent angles (epoch difference method). (a) Star sensor 1; (b) star sensor 2; (c) star sensor 3; (d) star sensor 4
Fig. 7. Characteristics of angle between optical axes of star sensors 3 and 4 after correcting for aberration. (a) Optical axis angle between star sensors 3 and 4; (b) thermal stability error of optical axis angle between star sensors 3 and 4; (c) optical axis angle error between star sensors 3 and 4
Fig. 8. Low frequency error and noise equivalent angle of sensors 3 and 4 after correcting for aberration. (a) Low frequency error of field of view period; (b) noise equivalent angle
Fig. 9. Angle between axes of star sensors before correcting for precession. (a) Between star sensors 1 and 3; (b) between star sensors 1 and 4; (c) between star sensors 2 and 3; (d) between star sensors 2 and 4
Fig. 10. Angle between axes of star sensors after correcting for precession. (a) Between star sensors 1 and 3; (b) between star sensors 1 and 4; (c) between star sensors 2 and 3; (d) between star sensors 2 and 4
Table 1. Summary of error between star sensors
View tableTable 1. Summary of error between star sensors
Error classification Star sensors 1 and 2 Star sensors 3 and 4 Note Orbital period error 1.1112″@±1 ℃
(X/Y: 0.7857″@±1 ℃)
11.2637″@±0.25 ℃
(X/Y: 7.9647″@±0.25 ℃)
1) Thermal stability error
(bracket thermal deformation and star sensor thermal deformation);
2) optical aberration
Noise equivalent angle (NEA) 1.3006″ (X/Y: 0.9197″) 1.5245″ (X/Y: 1.0779″) Peel off satellite platform shaking and bracket thermal deformation Low spatial frequency error (LSFE) 1.4057″ (X/Y: 0.9940″) 3.9543″ (X/Y: 2.7961″) Total random error (NEA+LSFE) 1.9127″ (X/Y: 1.3525″) 4.3238″ (X/Y: 3.0574″)
Table 2. Noise equivalent angle statistics of star sensors 1‒4 using epoch difference method
View tableTable 2. Noise equivalent angle statistics of star sensors 1‒4 using epoch difference method
Error classification Direction Star sensor 1 Star sensor 2 Star sensor 3 Star sensor 4 Noise equivalent angle X 1.13 1.29 1.50 1.63 Y 1.22 1.29 1.51 1.61 Z 10.33 12.75 5.36 7.20
Table 3. Summary of error before and after star sensor aberration correction
View tableTable 3. Summary of error before and after star sensor aberration correction
Error classification Star sensors 3 and 4 before aberration correction Star sensors 3 and 4
after aberration correction
Notes Orbital period error 11.2637″@±1 ℃
(X/Y: 7.9647″@±1 ℃)
2.5689″@±0.25 ℃
(X/Y: 1.8165″@±0.25 ℃)
1) Thermal stability error
(bracket thermal deformation and star sensor thermal deformation);
2) optical aberration
Noise equivalent angle (NEA) 1.5245″ (X/Y: 1.0779″) 1.5037″ (X/Y: 1.0631″) Peel off satellite platform shaking and bracket thermal deformation Low spatial frequency error (LSFE) 3.9543″ (X/Y: 2.7961″) 4.4585″ (X/Y: 3.1522″) Total random error (NEA+LSFE) 4.3238″ (X/Y: 3.0574″) 4.7922″ (X/Y: 3.3886″)
Table 4. Summary of star sensor error before and after correcting for precession
View tableTable 4. Summary of star sensor error before and after correcting for precession
Error classification Before precession correction /（″） After precession correction /（″） Variation /（″） Rate /% Range of optical axis angle variation between star sensors 1 and 3 104 36 68 65.38 Range of optical axis angle variation between star sensors 1 and 4 118 57 61 51.69 Range of optical axis angle variation between star sensors 2 and 3 111 43 68 61.26 Range of optical axis angle variation between star sensors 2 and 3 144 25 119 82.63
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Yanqing Wang, Weifeng Du, Yongkang Wu, Yuan Gao, Jinfeng Zhong. Analysis of Star Sensor In-Orbit Accuracy[J]. Acta Optica Sinica, 2025, 45(12): 1228002
Paper Information
Category: Remote Sensing and Sensors
Received: Nov. 7, 2024
Accepted: Dec. 13, 2024
Published Online: Jun. 23, 2025
The Author Email: Jinfeng Zhong (zhongjinfeng822@126.com)
CSTR:32393.14.AOS241726
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