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Lunar center vector and sun direction extraction method based on a lunar imaging sensor

An imaging sensor and extraction method technology, which is applied in the field of satellite autonomous navigation, can solve the problems of blurred moon phase outline pixels and low precision of the sun vector direction, and achieve the effects of wide application range, reduced influence of precision, and high precision

Pending Publication Date: 2021-11-02
INNOVATION ACAD FOR MICROSATELLITES OF CAS +1
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  • Application Information

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Problems solved by technology

However, the method in this document is suitable for the situation where the distance from the moon is far away, and it is not suitable for satellites flying around the moon. At the same time, compared with the contour pixels of the moon's edge, the moon phase contour pixels will be more blurred, so this method calculates The sun vector direction is less accurate

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  • Lunar center vector and sun direction extraction method based on a lunar imaging sensor
  • Lunar center vector and sun direction extraction method based on a lunar imaging sensor
  • Lunar center vector and sun direction extraction method based on a lunar imaging sensor

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Embodiment 1

[0047] The lunar phase seen by the observer is the area of ​​the lunar surface illuminated by the sun, which is mainly caused by changes in the relative positions between the observer, the moon and the sun. Therefore, the observed moon phase not only contains the moon center vector information, but also contains the sun vector information. Below we describe how to extract the lunar center vector and sun vector direction from a moon phase image.

[0048] Such as figure 1 As shown, the solid line circle represents the moon, O m Indicates the center of the moon, in the sensor coordinate system O′ f x s Y s Z s middle, Indicates the direction of the optical axis, denoted by f; O' m Indicates the center of the moon O m The position on the imaging focal plane, Indicates the direction that the center of the moon points to the observer, denoted by R, and the angle between the direction of the vector and the direction of the optical axis is θ. X in the picture s O' f Y S...

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Abstract

The invention relates to a lunar center vector and sun direction extraction method based on a lunar imaging sensor, and the method employs the invariance feature of an included angle between a lunar edge contour direction and a lunar center vector direction, and the invariance feature of an included angle between a lunar phase contour point direction and a sun vector direction. The vector directions of the lunar center vector and the sun vector in the coordinate system of the lunar sensor are respectively calculated by combining with a least square method, and finally the vector directions are corrected through the theoretical calculation value of the included angle between the sun vector and the lunar vector, so that the high-precision lunar center vector and the sun direction are obtained at the same time. Compared with the prior art, the method is simple, high in precision, wide in application range and suitable for various conditions that the moon, the sun and observers are in different relative directions and relative positions, and the influence of moon phase contour fuzzification on the precision is reduced.

Description

technical field [0001] The invention relates to the technical field of satellite autonomous navigation, in particular to a method for extracting a lunar center vector and a sun direction based on a lunar imaging sensor. Background technique [0002] With the development of deep space exploration technology, satellites have higher and higher requirements for autonomous navigation capabilities. Astronomical navigation uses external celestial bodies as references to provide navigation information. It has high autonomy, strong anti-interference, and no cumulative error. These advantages make astronomical navigation Navigation occupies an important position in the field of autonomous navigation. As the brightest celestial body on the earth at night, the moon can not only obtain the moon azimuth and distance information, but also extract the sun azimuth information according to the change of its moon phase, which is extremely important for both near-Earth satellites and satellites...

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Application Information

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IPC IPC(8): G01S19/42G01S19/25G01C21/02
CPCG01S19/42G01S19/258G01C21/025Y02A90/10
Inventor 杨中光蔡志鸣朱晓铖秦根健陈琨陈雯余金培
Owner INNOVATION ACAD FOR MICROSATELLITES OF CAS
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