Star image point position extracting method for star sensor

A technology of star sensor and extraction method, used in astronomical navigation, integrated navigator and other directions

Inactive Publication Date: 2010-12-08
NAT UNIV OF DEFENSE TECH
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  • Abstract
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Problems solved by technology

[0004] The technical problem to be solved in the present invention is: Aiming at the problems existing in the star image point position extraction method of the existing star sensor, a method for extracting the star image point position based on Kalman filter is proposed

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  • Star image point position extracting method for star sensor
  • Star image point position extracting method for star sensor
  • Star image point position extracting method for star sensor

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Embodiment Construction

[0049] Adopt the present invention to locate the stars in the star map collected by the star sensor, the specific steps are as follows:

[0050] The first step is to use the all-sky recognition pattern algorithm to obtain the attitude information of the star sensor at the initial moment, the position of the star image point in the star map and the instantaneous velocity.

[0051] The second step is to predict the position of the star image point, the method is:

[0052] 2.1 Determine the instantaneous velocity of the star image point

[0053] 2.2 Predicting the positions of star image points

[0054] The third step is to read in the star chart at the current moment.

[0055] The fourth step is to obtain the measurement value of the star image point position in the current star map based on the method of extracting the star image point position of the facet type,

[0056] specific method:

[0057] 4.1 Stellar Threshold Segmentation

[0058] 4.2 Use formula 5 to calculate t...

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Abstract

The invention discloses a star image point position extracting method for a star sensor. The method comprises the following steps of: forecasting a star image point position in a current star map according to a star image point position in a star map of a previous frame and an instantaneous speed; acquiring a measured value of the star image point position by adopting a facet-based star image point position extracting method; and finally, constructing a Kalman filter by using a forecasting value and the measured value of the star image point position as inputs, and acquiring a final star image point position. The star image point position in the current star map is forecasted by using the star image point position in the star map of the previous frame and the instantaneous speed so as to effectively improve the start extracting speed; the star image point position is updated by using the Kalman filter so as to effectively reduce random noise and further improve the measurement precision; and the measurement precision of the method can be improved by 2.4 times compared with a traditional method.

Description

technical field [0001] The invention relates to a method for extracting the position of a star image point in a star map of a star sensor in the field of aerospace measurement; in particular, it relates to a method for extracting the position of a star image point of a star sensor based on a Kalman filter. Background technique [0002] There are existing methods for extracting star image points, such as centroid method, surface fitting method, neural network method and so on. They all directly use the results calculated by sub-pixel technology as the final star image point position, and no effective suppression measures are taken for the random noise of sub-pixel technology positioning. Therefore, although the systematic error of star image point position extraction can be eliminated through algorithm improvement, calibration and other methods, the random noise has not been well resolved so far. In addition, star image point position extraction is one of the most time-consu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C21/02G01C21/24
Inventor 刘海波杨建坤谭吉春杨俊才李修建贾辉宿德志王文亮廖家莉
Owner NAT UNIV OF DEFENSE TECH
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