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Roller shutter exposure star sensor star point position correction method based on average speed

A star sensor and average velocity technology, applied in instruments, measuring devices, celestial navigation, etc., can solve problems such as the difficulty of solving angular velocity components, and achieve the effects of improving attitude measurement accuracy, small calculation amount, and good stability

Active Publication Date: 2020-07-14
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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Problems solved by technology

In this method, in the absence of a gyroscope, it is very difficult to solve the angular velocity components along the horizontal (X) and vertical (Y) directions of the star map. At the same time, the angular velocity of each star point in the star map is different.

Method used

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  • Roller shutter exposure star sensor star point position correction method based on average speed
  • Roller shutter exposure star sensor star point position correction method based on average speed
  • Roller shutter exposure star sensor star point position correction method based on average speed

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Embodiment Construction

[0026] The method of the present invention will be further described below in conjunction with specific examples.

[0027] The specific process is as figure 1 shown. Take the XXX star sensor product as an example, the focal length is 24.09mm, the pixel size is 0.0055mm, the field of view is 20°×20°, the star image width is 1526 columns, and the height is 1555 lines. The interval time is 43.9μs, and the exposure time of each row is 68ms. Take asterisk 1101 (right ascension 87.2540169°, declination 24.5673835°), asterisk 205 (right ascension 84.411171°, declination 21.1425082°), asterisk 165 (right ascension 93.7193706°, declination 22.5067614°), asterisk 37 ( Right ascension 81.5729833°, declination 28.6073971°), asterisk 543 (right ascension 83.0532416°, declination 24.57583°) as an example for further explanation.

[0028] Concrete steps of the present invention are as follows:

[0029] Step (1), use two consecutive frames of rolling shutter to expose the star map (set as...

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Abstract

The invention discloses a roller shutter exposure star sensor star point position correction method based on average speed, which comprises the following steps of 1) according to two continuous framesof star maps (a qth frame and a (q + 1)th frame), obtaining the star point centroid position and the average speed of the star point moving along the horizontal and vertical directions in the (q + 1)th frame of star map, 2) taking the kth row of exposure time of the (q + 1)th frame of image as a reference, and obtaining the corrected star point position in the (q + 1)th frame of star map, 3) resolving the angular distance measured value between the star points after correction, comparing the angular distance measured value with the angular distance theoretical value under a celestial coordinate system, and verifying the correctness of the star point position after correction in the step 2) according to the angular distance error, and 4) according to the corrected star point centroid coordinates solved in the step 2) and the verification conclusion in the step 3), resolving to obtain the star sensor attitude corresponding to the kth row exposure moment of the (q + 1)th frame of image.According to the method, the position correction relation is established based on the line exposure moment and the star point average movement speed in the roller shutter exposure star map, and the attitude measurement precision of the star sensor in the roller shutter exposure mode under the star point movement condition is improved.

Description

technical field [0001] The invention relates to the technical field of star point position correction of a rolling shutter exposure mode star sensor, in particular to a method for correcting the star point position of a rolling shutter exposure star sensor based on an average speed. Background technique [0002] The star sensor is the core component to realize the autonomous attitude measurement of the spacecraft by observing the azimuth of the stars in space. The traditional star sensor mainly adopts the global exposure mode. Nowadays, the star sensor in the rolling shutter exposure mode is gradually used in practical projects because of its advantages in improving dynamic performance and attitude update rate. However, the rolling shutter exposure mode adopts line-by-line exposure, and there is a time interval between lines, which causes the star point position after imaging to deviate from the theoretical position. , an important prerequisite for attitude calculation. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C21/02G01C25/00
CPCG01C21/02G01C25/00
Inventor 赵汝进何隆东刘恩海田宏周武林张辉颜坤马跃博
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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