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A Star Map Recognition Method Based on Directed Ring

A technology of star map recognition and directional ring, which is applied in astronomical navigation and other directions, and can solve the problems of recognition rate affected by magnitude error and camera calibration error

Inactive Publication Date: 2015-08-12
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 affected by magnitude errors, camera calibration errors, etc., so as to improve the reliability of attitude determination of domestic high-resolution remote sensing satellites

Method used

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  • A Star Map Recognition Method Based on Directed Ring
  • A Star Map Recognition Method Based on Directed Ring
  • A Star Map Recognition Method Based on Directed Ring

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Embodiment Construction

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

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

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

[0067] Step 1. Pre-store the navigation star list;

[0068] The navigation star table includes a basic star table and a star diagonal distance index table. The basic star catalog is extracted from the original star catalog according to the principle of stellar brightness and uniformity. The basic catalog includes the star's asterisk, magnitude, right ascension and declination information...

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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 the sensor attitude measurement technology, and particularly relates to a star pattern recognition method based on a directed ring, which is applied to the attitude determination of a star sensor. Background technique [0002] As the resolution of satellite images increases, the positioning accuracy of satellite images needs to be improved accordingly to give full play to the advantages of high resolution images. At present, not relying on ground control points, and directly using satellite position and attitude data to obtain high-precision image positioning information has become an important development trend in the application of remote sensing satellites at home and abroad. Direct positioning of high-precision remote sensing images places higher requirements on the satellite attitude accuracy. In the past, the sun sensor, infrared earth sensor, and gyroscope used in the spacecraft to determine the attitude of the spacecraft, h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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