Acta Photonica Sinica, Volume. 54, Issue 2, 0254111(2025)
Correction of Measurement Errors of Star Sensors in Orbit
Figures & Tables(12)
Fig. 5. Outline drawing and temperature field distribution of the light shield
Table 1. Key technical indicators of thermal stability test system
View tableView in ArticleTable 1. Key technical indicators of thermal stability test system
Error items Error value Position error/m Proportion Notes GNSS positioning error 0.1 m 0.14 0.02% Dual band dual-mode GNSS Random error in attitude measurement 1.0″ 3.43 12.30% NEA of the star sensor Low frequency error in attitude measurement 1.0″ 3.43 12.30% LSFE of the star sensor Thermal deformation between the star sensor and the camera Star sensor bracket 1.2″ 8.23 70.81% Star sensors and cameras and precise temperature control Bracket relative to the camera reference Star sensor sight pointing 1.2″ Satellite platform jitter attitude error 0.6″ 2.06 4.44% Attitude stability Time synchronization error 20.0 μs 0.14 0.02% Hardware pulse Residual calibration 0.3 pix 0.21 0.04% Camera internal orientation elements Stability 0.3 pix 0.21 0.04% Total accuracy 9.78 100% The root mean square of the 10 error items mentioned above
Table 2. Optimal statistical table of detection parameters
View tableView in ArticleTable 2. Optimal statistical table of detection parameters
Parameter Mean X Mean Y Opt X Opt Y Improve X Improve Y Exposure time 0.012 6 0.016 8 0.011 5 0.014 8 8.73% 11.90% ADC_gain 0.010 2 0.007 7 0.009 3 0.007 3 8.82% 5.19% PGA_gain 0.010 5 0.009 2 0.010 8 0.008 9 -2.86% 3.26% Ramp 0.010 9 0.014 8 0.011 3 0.012 5 -3.67% 15.54% Offset 0.009 6 0.009 5 0.008 8 0.008 3 8.33% 12.63%
Table 3. The statistical of the influence of dynamic weight algorithm on the precision of star sensor
View tableView in ArticleTable 3. The statistical of the influence of dynamic weight algorithm on the precision of star sensor
Test items Fixed weight algorithm Dynamic weight algorithm Accuracy improvement Noise equivalent angle
（NEA， 3σ）
X-axis 2.01″ 1.08″ 46.27% Y-axis 2.07″ 0.99″ 52.17% Z-axis 19.08″ 10.09″ 42.87%
Table 4. Simulation result of sight thermal drift of star sensor
View tableView in ArticleTable 4. Simulation result of sight thermal drift of star sensor
Technical status Surface temperature/（″/℃） Baffle temperature/（″/℃） Magnesium alloy X direction：1.82
Y direction：0.31
X direction：0.01
Y direction：0.19
Silicon carbide X direction：1.32
Y direction：0.17
X direction：0.02
Y direction：0.14
Silicon carbide +weight reduction slot filling X direction：0.65
Y direction：0.16
X direction：0.14
Y direction：0.17
Silicon carbide +weight reduction slot filling+lens 4 feet X direction：0.09
Y direction：0.18
X direction：0.15
Y direction：0.15
Table 5. Comparison of bore sight thermal drift between simulation and test
View tableView in ArticleTable 5. Comparison of bore sight thermal drift between simulation and test
Technical status Direction Simulation（″/℃） Thermal stability test（″/℃） Magnesium alloy X 1.82 1.03 Y 0.31 -0.14 Silicon carbide+weight reduction slot filling+lens 4 feet X 0.09 -0.12 Y 0.18 0.12
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Yanqing WANG, Jinfeng ZHONG, Weifeng DU, Yongkang WU, He JIN, Xunjiang ZHENG. Correction of Measurement Errors of Star Sensors in Orbit[J]. Acta Photonica Sinica, 2025, 54(2): 0254111
Paper Information
Category: Special Issue for Precise Beam Pointing for Space Gravitational Wave Detection
Received: Aug. 1, 2024
Accepted: Oct. 23, 2024
Published Online: Mar. 25, 2025
The Author Email: JIN He (wangyanqing803@aliyun.com)
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