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A method for constructing star library of triangle matching star sensor

A technology of star sensor and construction method, which is applied in the field of star library construction, can solve problems such as storage consumption, uneven distribution of sky area and pointing accuracy, and improve real-time performance and measurement accuracy. The method is simple and easy to ensure identification The effect of accuracy and measurement accuracy

Active Publication Date: 2021-01-05
BEIJING AEROSPACE INST FOR METROLOGY & MEASUREMENT TECH +1
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Problems solved by technology

[0008] The purpose of the present invention is to overcome the shortcomings of the simple star library generation method in terms of storage consumption, uneven distribution of sky areas, pointing accuracy, etc., and propose a triangle matching star sensor star library construction method

Method used

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  • A method for constructing star library of triangle matching star sensor
  • A method for constructing star library of triangle matching star sensor
  • A method for constructing star library of triangle matching star sensor

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Embodiment Construction

[0060] A method for constructing a triangular matching star sensor star library, comprising the following steps:

[0061] S1: Determination of basic cut-off magnitude and candidate cut-off magnitude

[0062] Assume that the detection field angle of the star sensor is θ FOV , then the basic cut-off magnitude M v-base There is an empirical relationship with the average number of stars n in the field of view, as shown in formula (1):

[0063]

[0064] The candidate cut-off magnitude is the dimmest magnitude that the photoelectric detection system of the target star sensor can be sensitive to, and the limit magnitude is obtained according to the constraint of the signal-to-noise ratio. The noise approximately satisfies the normal distribution, as shown in formula (2):

[0065]

[0066] Among them, μ(u,v) is the size of the pixel signal energy, n d is the dark current noise, n DSNU is the dark current corresponding non-uniformity, n PRNU is the photoresponse heterogenei...

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Abstract

A construction method of a star database of a triangle matching-type star sensor includes steps of: S1) determining basic cut-off magnitude and candidate cut-off magnitude; S2) rejecting peculiar stars; S3) performing fixed star proper motion compensation algorithm; S4) determining threshold of angular distances of neighboring fixed stars; S5) performing whole-celestial sphere helical line traversal; S6) determining relative bright stars; and S7) generating database of angular distances between stars.

Description

technical field [0001] The invention belongs to the field of star library construction, and in particular relates to a method for building a triangle-matched star sensor star library. Background technique [0002] According to relevant searches, the current method for constructing the star library of star sensors is relatively simple. The navigation star library is generally based on the visible light astronomical star library. According to the limit observation magnitude of the optical system design, all the stars whose apparent magnitude is smaller than the threshold in the astronomical star catalog are included in the navigation star database. The inter-star angular distance database is any two stars whose angular distance is smaller than the field of view in the exhaustive navigation star library. [0003] The star sensor is a highly autonomous navigation device, so prior information such as the navigation star library is generally solidified on the on-chip read-only me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C21/02
CPCG01C21/025
Inventor 熊琨王春喜姜云翔王锴磊刘莎沙春哲王强刘都
Owner BEIJING AEROSPACE INST FOR METROLOGY & MEASUREMENT TECH
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