ZHONG Xing, JIAO Ji-qiang, JIN Guang, QU Hong-song, LIU Guo-song. Detecting performance and overall design of airborne daytime star sensor for navigation[J]. Editorial Office of Optics and Precision Engineering, 2011,19(12): 2900-2906
ZHONG Xing, JIAO Ji-qiang, JIN Guang, QU Hong-song, LIU Guo-song. Detecting performance and overall design of airborne daytime star sensor for navigation[J]. Editorial Office of Optics and Precision Engineering, 2011,19(12): 2900-2906 DOI: 10.3788/OPE.20111912.2900.
Detecting performance and overall design of airborne daytime star sensor for navigation
The detecting performance of an airborne daytime star sensor for navigation is analyzed and a daytime star sensor prototype is researched. Mathematical models of Signal to Noise-Ratio(SNR) and contrast of a photoelectric imaging system in daytime under noises are established
and calculated results by different focal lengths and different apertures are compared to conclude the influence of system parameters on the detection results and the requirements of optical system.The conclusion shows that the proper relative aperture of optical system is 1/15. A daytime star sensor prototype for tracking stars of magnitude 3 is designed. Tracking images of the polestar from sunrise to noon are acquired by a ground experiment using a
F
/15 objective
and brightnesses and contrasts of star images at different time are compared. It shows that the contrast of star image has descended from 1.55 at 5:00 a.m. to 1.2 at 12:00 a.m. The minimal degree of modulation is more than 0.03 by calculating with the prototype's parameters
which shows that the optical system with
70 mm and
F
/15 can satisfy the detecting requirements. The theoretic analysis and design is proved to be available
and the research can be a reference for developing of miniaturized and precise airborne daytime navigation star sensors.
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references
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