Method for determining satellite attitude based on visible light earth sensor

A technology of earth sensor and satellite attitude, which is applied in the field of satellite control, can solve the problems of time measurement accuracy, satellite attitude angle measurement accuracy drop, etc., and achieve the effect of simple algorithm, improved accuracy, and good robustness

Active Publication Date: 2016-09-07
AEROSPACE DONGFANGHONG SATELLITE
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Problems solved by technology

[0006] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to provide a method for determining the satellite attitude based on the visible light earth sensor, and to solve the time measurement accuracy and the angular velocity measurement of the scanning mechanism in the determination of the satel

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  • Method for determining satellite attitude based on visible light earth sensor
  • Method for determining satellite attitude based on visible light earth sensor
  • Method for determining satellite attitude based on visible light earth sensor

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Embodiment Construction

[0023] With the rapid development of miniaturized CMOS imaging devices, it not only provides a great possibility for the real use of the earth's visible light sensor, but also conforms to the development trend of satellites. The invention proposes a complete set of methods on how to determine the two-axis attitude of the satellite to the ground based on the visible light earth sensor.

[0024] Such as figure 1 As shown in the flow process, the method of the present invention mainly includes the following steps: the first, the input image after the CMOS imaging device images the earth; the second, image preprocessing; the third, extracting the effective edge of the image; the fourth, applying least squares Fifth, under the assumption that the satellite's attitude angle to the ground is a small angle, the roll and pitch attitude angles of the satellite are approximately calculated according to the center of the effective edge. The above five steps are described in detail below....

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Abstract

The invention provides a method for determining satellite attitude based on a visible light earth sensor. The method employs the visible light earth sensor to determine the two-axis attitude of a satellite relative to the earth and comprises the following steps: processing an earth image produced by a CMOS imaging device so as to extract the effective boundary of the earth image; then extracting the center of the effective boundary by using least squares fitting; and on the hypothesis that the attitude angle of the satellite relative to the earth is a small angle, approximately calculating the roll angle and pitch angle of the satellite relative to the earth so as to eventually determine the two-axis attitude of the satellite relative to the earth. Compared with a traditional method using an infrared earth sensor for determination of the rolling and pitching two-axis attitude of satellites relative to the earth, the method provided by the invention has the advantages that the method improves the measurement precision of the two-axis attitude of the satellite relative to the earth, is applicable to measurement of the attitude miniature micro-satellites and conforms to the current development trend of micro-satellites.

Description

technical field [0001] The invention belongs to the field of satellite control and relates to a method for determining the attitude of a satellite. Background technique [0002] At present, among the sensors that use the earth as a reference vector to determine the satellite attitude angle, the infrared earth sensor has been widely used and is becoming more and more mature. Therefore, it has become a common method to use the infrared earth sensor to determine the two-axis attitude angle of the satellite to the ground. . [0003] The existing method of using the infrared earth sensor to determine the two-axis attitude angle of the satellite to the earth is: on the one hand, using the infrared earth sensor scanning mechanism to enter and exit the carbon dioxide infrared radiation belt of the earth and the time when the infrared scanning mechanism reaches the reference point, calculate the infrared earth The sensor scans the chord width of the earth and the geocentric vector E...

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Application Information

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IPC IPC(8): G01C21/24
CPCG01C21/24
Inventor 万小波张晓敏
Owner AEROSPACE DONGFANGHONG SATELLITE
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