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Space luminous environment adaptability of missile-borne star sensor

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Abstract

To solve the problem of stray interference to star point target identification while a star sensor imaging to the sky, a study on space luminous environment adaptability of missile-borne star sensor was carried out. By Plank blackbody radiation law and some astronomic knowledge, irradiancies of the stray at the star sensor working height were estimated. By relative astrophysical and mathematics knowledge, included angles between the star sensor optical axis point and the stray at any moment were calculated. The calculation correctness was verified with the star map software of Stellarium. By combining the upper analysis with the baffle suppression effect, a real-time model for space luminous environment of missile-borne star sensor was proposed. By signal-noise rate (SNR) criterion, the adaptability of missile-borne star sensor to space luminous environment was studied. As an example, a certain type of star sensor was considered when imaging to the starry sky on June 22, 2011 (the Summer Solstice) and September 20, 2011 (August 23 of the lunar year, last quarter moon) in Bei**g. The space luminous environment and the adaptability to it were simulated and analyzed at the star sensor working height. In each period of time, the stray suppression of the baffle is analyzed by comparing the calculated included angle between the star sensor optical axis point and the stray with the shielded provided by system index. When the included angle is larger than the shielded angle and less than 90°, the stray is restrained by the baffle. The stray effect on star point target identification is analyzed by comparing the irradiancy of 6 magnitude star with that of the stray on star sensor sensitization surface. When the irradiancy of 6 magnitude star is 5 times more than that of the stray, there is no effect on the star point target identification. The simulation results are identical with the actual situation. The space luminous environment of the missile-borne star sensor can be estimated real-timely by this model. The adaptability of the star sensor to space luminous environment can be analyzed conveniently. A basis for determining the relative star sensor indexes, the navigation star chosen strategy and the missile launch window can be provided.

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Authors and Affiliations

  1. School of Automation, Bei**g Institute of Technology, Bei**g, 100081, China

    Shu-fang Zhao  (赵述芳) & Yu Wang  (王渝)

  2. Bei**g Institute of Control and Electronic Technology, Bei**g, 100038, China

    Hong-tao Wang  (王洪涛)

  3. Tian** Medical Instrumentation Inspection Centre of SDA, Tian**, 300191, China

    Cai-yan Ji  (纪彩彦)

Authors
  1. Shu-fang Zhao  (赵述芳)
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  2. Hong-tao Wang  (王洪涛)
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  3. Yu Wang  (王渝)
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  4. Cai-yan Ji  (纪彩彦)
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Correspondence to Shu-fang Zhao  (赵述芳).

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Zhao, Sf., Wang, Ht., Wang, Y. et al. Space luminous environment adaptability of missile-borne star sensor. J. Cent. South Univ. 19, 3435–3443 (2012). https://doi.org/10.1007/s11771-012-1426-2

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  • DOI: https://doi.org/10.1007/s11771-012-1426-2

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