Anti-stray light star point extraction method for star sensor
A star sensor and star point extraction technology, applied in the field of star sensors, can solve the problems of undetectable star points, false detection, affecting attitude output results, etc., to improve performance, improve estimation accuracy, and accurately remove stray light energy. Effect
Pending Publication Date: 2022-02-08
江苏集萃智能光电系统研究所有限公司
View PDF0 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, in the face of complex stray light imaging images, these two methods may fail to detect star points or falsely detect "false stars", which will affect the attitude output results.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0117] Such as Figure 1-7 Shown, a star sensor anti-stray light star point extraction method, comprising the following steps:
[0118] Step S1, establishing a curved surface imaging model of stray light in the star sensor;
[0119] Under the interference of stray light, the model of star sensor imaging image is established as:
[0120] I i = S i +B i +N i
[0121] Among them, I i , S i , B i and N i Respectively represent the measured value, star energy intensity, stray light energy intensity and noise intensity on the i-th pixel.
[0122] In general, it is difficult to establish a description function for stray light imaging spots. According to the characteristics that the incident light is distributed into a smooth surface in a local area, the present invention models the imaging image of stray light in an image as a curved surface in a local area:
[0123] F(x,y)=a x 2 +b·y 2 +c xy+d x+e y+f
[0124] Among them, (a,b,c,d,e,f) are the parameters of the surface. ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses an anti-stray light star point extraction method for a star sensor. The method comprises the following steps of constructing a curved surface imaging model of stray light in a local area, and giving a description function of the curved surface model and a closed solution of curved surface parameters; constructing a local area of a star point by utilizing a neighborhood, designing a filtering matrix on the neighborhood, traversing each pixel position in the image, and estimating a stray light curved surface parameter by utilizing pixel information in the neighborhood; determining energy intensity of stray light at each pixel position according to the curved surface parameter information to obtain a stray light background image; a star point image with stray light removed being obtained through image subtraction operation, and star points being detected and extracted on the image. The method is advantaged in that star point extraction under the stray light interference is realized, the stray light interference can be effectively resisted, the number of detected star points under the stray light interference and the star point centroid positioning precision can be increased, attitude calculation precision and reliability of the star sensor under the stray light interference can be improved, and performance of the star sensor under the stray light interference is finally improved.
Description
technical field [0001] The invention belongs to the technical field of star sensors, and in particular relates to a star sensor anti-stray light star point extraction method. Background technique [0002] Stray light such as the sun, moonlight, earth atmosphere light, light reflected by space debris, and light around the test environment shines into the star sensor, and its energy increases the background gray value of the star point image. Due to the various sources of stray light, the images formed by stray light in the star sensor are various, which will affect the star point extraction effect. The number of extracted star points will be small and the accuracy of the center of mass will be poor, which will affect the star sensor. Accuracy and reliability of attitude calculations. Therefore, to solve the problem of star point extraction under stray light interference is the need for high-precision and high-reliability attitude of star sensors under stray light interferenc...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/00G06T7/66G06F17/16G06F30/20
CPCG06T11/001G06T7/66G06F30/20G06F17/16
Inventor 魏新国王刚毅李苏祺
Owner 江苏集萃智能光电系统研究所有限公司