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A Simulation Method of Refracting Stars

A simulation method and technology of refracting stars, applied in astronomical navigation, navigation calculation tools, etc., can solve problems such as large gaps, and achieve the effect of low cost and simple operation

Inactive Publication Date: 2017-02-15
HARBIN ENG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

This method directly uses the calculated starlight refraction angle, does not simulate the refraction star map, and ignores the influence of environmental noise, star sensor noise, star point position noise and many other noises, which is far from the real situation. Therefore, these There is still a certain distance between the research results and the practical application

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  • A Simulation Method of Refracting Stars
  • A Simulation Method of Refracting Stars
  • A Simulation Method of Refracting Stars

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Embodiment Construction

[0044] Step 1: Scan the star catalog to determine whether the current star is a refracting star; if it is judged to be a refracting star, go to step 2, otherwise continue scanning;

[0045] figure 1 Middle: ha-minimum refraction height 20km, hb-maximum refraction height 50km, r-carrier position vector, Re-earth radius s 1 , s 2 - Direction vector of stellar starlight, θ R - Angle of starlight refraction at a refraction altitude of 20km.

[0046] When using the refraction star for navigation, the refraction height is generally selected to be 20km-50km according to the thickness of the stratosphere, that is, figure 1 In ha=20km, hb=50km; assuming that the direction vector of the starlight of a certain star is s, then by figure 1 A star that satisfies the following equation can be selected as a refractor star

[0047]

[0048] Among them, θ Ris the corresponding starlight refraction angle when the refraction height is 20km, which can be calculated by the atmospheric refr...

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Abstract

The invention relates to a simulating method of a refraction star. The simulating method is characterized by comprising the steps of step 1. scanning a star catalogue, and judging whether the current fixed star is the refraction star, if so, judging the fixed star as the refraction star, and implementing step 2, otherwise, continuing to scan; step 2. calculating the angle of refraction of starlight; step 3. solving the right ascension and the declination of the apparent position of the refraction star; step 4. judging whether the refracted starlight of the refraction star is captured by a star sensor, if the refracted starlight of the refraction star is judged to be captured by the star sensor, implementing step 5, otherwise, returning to the step 1; and step 5. calculating a star point imaging center and generating a simulating refraction star catalogue.

Description

technical field [0001] The invention relates to a method for simulating a refracting star. Background technique [0002] With the development of space technologies such as manned spaceflight and deep space exploration, various spacecraft have higher and higher requirements for autonomous navigation capabilities. The celestial navigation method based on the star sensor has become an effective means of autonomous navigation in space applications due to its high navigation accuracy and no error accumulation over time. Among the factors affecting the accuracy of celestial navigation, the sensitivity accuracy of the horizon is very important. According to the different ways of star sensors to sense the horizon, it can be divided into two methods: direct sensitivity to the horizon and indirect sensitivity to the horizon by starlight refraction. [0003] The direct sensitive horizon method is restricted by the accuracy of the horizon, and the navigation accuracy is low. The metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C21/02
CPCG01C21/02G01C21/20
Inventor 钱华明孙龙钱林琛蔡佳楠黄蔚沈忱吴永慧李浩李通
Owner HARBIN ENG UNIV
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