Design and experiment of airborne large field-of-view daytime star measurement

Qiancheng ZHANG; Sheng ZHONG; Xiancheng LI

doi:10.3788/IRLA20240609

Infrared and Laser Engineering, Volume. 54, Issue 7, 20240609(2025)

Design and experiment of airborne large field-of-view daytime star measurement

Qiancheng ZHANG^1,2,3, Sheng ZHONG^1,2, and Xiancheng LI³

Author Affiliations

¹School of Artificial Intelligence and Automation, Huazhong University of Science and Technology, Wuhan 430074, China

²National Key Laboratory of Science and Technology on Multi-Spectral Information Processing, Huazhong University of Science and Technology, Wuhan 430074, China

³Huazhong Institute of Electro-Optics-Wuhan National Laboratory for Optoelectronics, Wuhan 430223, China

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Figures & Tables(11)

Fig. 1. Curve of atmospheric background radiation

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Fig. 2. Curve of atmospheric transmission

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Fig. 3. High-altitude flight experiment

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Fig. 4. Image of star with an exposure-time of 20 ms

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Fig. 5. Image of star at a high altitude with an exposure-time of 25 ms

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Table 1. The number of measurable celestial bodies in the entire sky across different bands
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Table 1. The number of measurable celestial bodies in the entire sky across different bands
Magnitude Visible-band H-band
0 6 171
1 16 569
2 59 1825
2.5 97 3225
3 188 5527
4 575 15954
5 1789 45210
6 5036 130851

Table 2. Technical specifications of domestic detector
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Table 2. Technical specifications of domestic detector
Project Target
Active pixels 640×512
Pixel size 15 μm×15 μm
Band 0.9-1.7 μm
Full well capacity 1.4 Me-
Read noise 500e-
QE ＞70%
Operation temperature −40-50 ℃

Table 3. Design parameters and performance of lens
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Table 3. Design parameters and performance of lens
Project Target
Focal length 70 mm
F# 1.4
Aperture 50 mm
Transmittance 90%
Structure transmission
Circular field 18°

Table 4. Illuminance of H-band magnitude in atmospheric edge
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Table 4. Illuminance of H-band magnitude in atmospheric edge
Magnitude Illuminance of H-band magnitude/W·m⁻²
0 3.84×10⁻¹⁰
1 1.529×10⁻¹⁰
2 0.609×10⁻¹⁰
3 0.242×10⁻¹⁰

Table 5. Number of electrons generated by each magnitude
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Table 5. Number of electrons generated by each magnitude
Magnitude of H-band Number of electrons
0 22938
1 9131
2 3635
2.5 2293

Table 6. SNR of each magnitude
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Table 6. SNR of each magnitude
Magnitude Star electrons Background electrons SNR
0 22938e- 204255e- 36.5
1 9131e- 14.8
2 3635e- 5.9
2.5 2293e- 3.7

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Qiancheng ZHANG, Sheng ZHONG, Xiancheng LI. Design and experiment of airborne large field-of-view daytime star measurement[J]. Infrared and Laser Engineering, 2025, 54(7): 20240609

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