Optics and Precision Engineering, Volume. 32, Issue 11, 1686(2024)
Design of inertial space TDI camera for long arc active star source scanning
Figures & Tables(30)
Fig. 12. Sketch of TDI camera optical axis pointing at initial time
Fig. 13. Quaternion of body coordinate system to inertial coordinate system
Fig. 14. Semi-physical simulation experiment based on dynamic star simulator
Fig. 18. Comparison of TDI sweeping imaging and area-array imaging
Table 1. Specifications of TDI camera
View tableView in ArticleTable 1. Specifications of TDI camera
Parameters Value Effective resolution 3 200×128 Pixel size/μm 7 Pixel data width/bit 8 Maximum integration level 128 Maximum line frequency/kHz 100 Minimum line frequency/kHz 1 Clock frequency/MHz 40/60/85 Power consumption/W 3.5 Lens mount M42 Optical spacing/mm 10.10 Gain 1.0~8.0
Table 2. TDI imaging simulation parameters
View tableView in ArticleTable 2. TDI imaging simulation parameters
Parameter Value Angular rate/（（°）·s-1） 8.5 Integration level 128 Exposure time/ms 128 Line frequency/kHz 1 Imaging time/s 10
Table 3. Satellite orbit elements and attitude setting
View tableView in ArticleTable 3. Satellite orbit elements and attitude setting
Parameter Value Semimajor axis 6 928 140 Eccentricity 0 Orbital inclination 97.503 Ascension of the ascending node 202.996 Argument of periapsis 0 True anomaly 0.231 Roll angle -107.029 6 Pitch angle -10.800 7 Yaw angle 86.714 9 Tilt angle/（°） 90 Azimuth angle/（°） 0
Table 4. Parameters of dynamic star simulator
View tableView in ArticleTable 4. Parameters of dynamic star simulator
Parameter Value Focal length/mm 47.6 LCOS pixel size/µm 5.5 LCOS resolution 2 048×1 536 Sensor size/mm 11.25×8.45 Frame refresh rate/Hz 120 Field of view/（°） Exit pupil diameter/mm 20 Exit pupil distance/mm 35 Spectral range/nm 500~800 Optical transfer function 0.7（v=60 lp/mm） Relative distortion/% 0.02 Angular separation error/″ 7
Table 5. Experimental design for integral series
View tableView in ArticleTable 5. Experimental design for integral series
Group Speed/（（°）·s-1） Integration level Frequency/kHz Exposure/ms 1 8.5 32 1 32 2 8.5 64 1 64 3 8.5 96 1 96 4 8.5 128 1 128
Table 6. Experimental results of integral series
View tableView in ArticleTable 6. Experimental results of integral series
Group Gray level Star 1 Star 2 Star 3 SNR Tail 1 0.046 1 7.430 8 6.045 4 4.666 4 6.047 1 2 0.105 8 8.464 9 7.035 4 5.271 8 6.924 1 3 0.180 4 8.824 6 7.512 4 5.638 8 7.325 1 4 0.268 5 8.794 4 7.497 8 5.618 2 7.303 1
Table 7. Experimental design for sweeping speed
View tableView in ArticleTable 7. Experimental design for sweeping speed
Group Speed/（（°）·s-1） Integration level Frequency/kHz Exposure/ms 4 8.5 128 1 128 9 10.62 128 1.25 102.4 10 12.75 128 1.5 85.3 11 14.87 128 1.75 73.1 12 17 128 2 64
Table 8. Experimental results of sweeping speed
View tableView in ArticleTable 8. Experimental results of sweeping speed
Group Gray level Star 1 Star 2 Star 3 SNR Tail 4 0.268 8.794 7.497 5.618 7.303 1 9 0.196 8.705 7.572 5.604 7.294 1 10 0.15 8.824 7.490 5.389 7.234 1 11 0.124 8.783 7.324 5.339 7.149 1 12 0.104 8.636 7.258 5.226 7.040 1
Table 9. Array imaging contrast experimental design
View tableView in ArticleTable 9. Array imaging contrast experimental design
Group Speed/（（°）·s-1） Exposure/ms 5 8.5 32 6 8.5 64 7 8.5 96 8 8.5 128
Table 10. Experimental results of planar array imaging
View tableView in ArticleTable 10. Experimental results of planar array imaging
Group Gray level Star 1 Star 2 Star 3 SNR Tail 5 0.119 2.178 1.867 1.361 1.802 3.5 6 0.228 1.515 1.299 0.947 1.254 6.8 7 0.210 1.432 1.228 0.895 1.185 10.0 8 0.311 1.270 1.089 0.794 1.051 12.5
Table 11. Results of traditional area-array imaging methods
View tableView in ArticleTable 11. Results of traditional area-array imaging methods
Group Speed/（（°）·s-1） Exposure/ms Imaging time/s SNR 0（TDI） 8.5 96 10 7.325 2 1（Area） 0 96 ∞ 10.048 2 2（Area） 0.5 96 170 9.517 1 3（Area） 1 96 85 8.649 6 4（Area） 1.5 96 56.67 8.079 8 5（Area） 2 96 42.5 7.611 8 6（Area） 2.5 96 34 7.064 1 7（Area） 3 96 28.33 6.267 8 8（Area） 3.5 96 24.29 5.520 5 9（Area） 4 96 21.25 4.823 5 10（Area） 4.5 96 18.89 3.862 4
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Andong YAN, Zongqiang FU, Shutong ZENG, Lin CHANG, Xiubin YANG. Design of inertial space TDI camera for long arc active star source scanning[J]. Optics and Precision Engineering, 2024, 32(11): 1686
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Received: Nov. 14, 2023
Accepted: --
Published Online: Aug. 8, 2024
The Author Email: CHANG Lin (fagnlinchang@aliyun.com)
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