Star pattern recognition method based on directed loop

A technology of star map recognition and directional rings, which is applied in astronomical navigation and other directions, and can solve problems such as camera calibration errors, recognition rate and star magnitude errors, etc.

Inactive Publication Date: 2013-06-12
自然资源部国土卫星遥感应用中心
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Problems solved by technology

[0017] The invention provides a star map recognition method, which solves the problem that the recognition rate of the existing star map recognition method is greatly affe

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  • Star pattern recognition method based on directed loop
  • Star pattern recognition method based on directed loop
  • Star pattern recognition method based on directed loop

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Embodiment Construction

[0064] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0065] The invention proposes a star pattern recognition method. In the present invention, the parameters of the stellar camera are set as follows: the field of view is 8°×8°, the size of the CCD area array is 512×512 pixels, and the size of a single pixel is 10um. According to the main distance and field of view and the area array The principal distance is 36.61mm, and the principal point and distortion parameters are all set to 0.

[0066] Concrete steps of the present invention are as follows:

[0067] Step 1, store the navigation star table in advance;

[0068] The navigation star catalog includes a basic star catalog and a star pair angular distance index table. The basic star catalog is extracted from the original star catalog according to the principle of star brightness and uniformity. The basic star catalog includes the star's asterisk, magnitude,...

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Abstract

The invention provides a star pattern recognition method based on a directed loop. In the method, a brightest star in a field of view is selected as a reference star, the reference star and neighboring stars are connected to form a radial star pattern, a candidate reference star matching group is obtained through a matching probability method, then, the neighboring stars are used for forming a directed loop model, and based on the principle of integral matching and a longest matching chain, an optimal matching group is selected as a final recognition result. In comparison with the prior art, the method has the advantages of high success rate of star pattern recognition, high recognition speed, and so on. The star pattern recognition method provided by the invention can guarantee that the star pattern recognition success rate reaches 99% and the recognition speed reaches 5-10 HZ when the position error of stellar image points is superior to a 0.1 pixel.

Description

technical field [0001] The invention belongs to sensor attitude measurement technology, in particular to a star map recognition method based on a directed ring, which is applied to a star sensor for attitude determination. Background technique [0002] As the resolution of satellite images increases, the positioning accuracy of satellite images also needs to be improved accordingly in order to give full play to the advantages of high-resolution images. At present, it has become an important development trend of remote sensing satellite applications at home and abroad to directly use satellite position and attitude data to obtain high-precision image positioning information without relying on ground control points. Direct positioning of high-precision remote sensing images puts forward higher requirements for satellite attitude accuracy. Attitude determination equipment such as sun sensors, infrared earth sensors, and gyroscopes used in spacecraft attitude determination in t...

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Application Information

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IPC IPC(8): G01C21/02
Inventor 谢俊峰唐新明江万寿高小明付兴科赵利平
Owner 自然资源部国土卫星遥感应用中心
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