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Method for identifying long-distance space motion target based on stellar map matching

A space motion and target recognition technology, applied in the aerospace field, can solve the problems of missing moving targets, small amount of calculation, and difficult space background recognition of moving targets, and achieve high anti-interference, efficient acquisition, complexity and noise reduction. sensitive effect

Inactive Publication Date: 2011-11-23
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Considering the characteristics of the relative motion between the complex background and the moving target, it is difficult for the current classic registration difference algorithms to adapt to the moving target recognition of the spatial background.
The characteristics of the images taken by the visible light camera of the miniature space probe: the background of the image is mainly composed of stars, and the stars cannot be connected into lines or any other graphics, which makes it difficult to find the registration basis for the commonly used registration methods; The imaging is small and mixed among the stars, so there are no obvious features in the images taken by the visible light camera of the miniature space probe. Therefore, it is urgent to find a practical method with high recognition rate, small calculation amount, and search, identify and track the moving target at a long distance.

Method used

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  • Method for identifying long-distance space motion target based on stellar map matching
  • Method for identifying long-distance space motion target based on stellar map matching
  • Method for identifying long-distance space motion target based on stellar map matching

Examples

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Embodiment 1

[0022] Example 1: Combining Figure 6 , the present invention is based on a star map matching long-distance space moving target recognition method, the steps are as follows:

[0023] Step 1: Extract the image point coordinates of the original images captured by the visible light cameras of all miniature space probes, and save all image point energy;

[0024] Step 2: sort all the image points in descending order of energy;

[0025] Step 3: Form all triangles by combining the sorted image points;

[0026] Step 4: Read the star catalog in the memory of the visible light camera of the miniature space probe;

[0027] Step 5: Use a triangle recognition algorithm to recognize all triangles formed by the image points;

[0028] Step 6: Eliminate all identified image points;

[0029] Step 7: Keep the unrecognized image point, which is the moving target image point.

Embodiment 2

[0030] Example 2: Combining Figure 2-Figure 4 , the working principle of the visible light camera of the miniature space probe of the present invention is as follows figure 2 As shown, the image points in the captured images are almost all stellar image points (such as image 3 ), star image points cannot be connected into a line or any other conventional graphics, which makes it difficult to find a registration basis for common registration methods. The star catalog contains all the stars in the celestial sphere, so the star map recognition algorithm can be used to find out the corresponding stars from the star catalog for all the star images in the images taken by the visible light camera of the miniature space probe, and pick out the identified star images. The next one is the image point of the moving target. According to the original image captured by the visible light camera of the miniature space probe, the coordinates of all the image points are extracted from it (...

Embodiment 3

[0032]Embodiment 3: The main performance index of the present invention: the main observation surface of the moving target is about 2m×2m. In the long-distance section of 15km to 30km, the illumination is provided by sunlight and earth reflection, and the magnitude of the moving target is equivalent to 2nd to 6th magnitude. The visible light camera resolution of the miniature aerospace probe that shoots the target is 1024×1024, the field of view is 14°×14°, and it can detect stars above magnitude 6. The imaging of the moving target is specially defocused into multiple pixels, and the miniature aerospace The visible light camera of the detector has a certain disturbance. When oriented to the ground or to inertial orientation, the attitude pointing error is 0.1°, and the attitude stability is 0.05° / s; 0.1° / s. The navigation star library in the visible light camera of the miniature space probe comes from the SKY2000 star catalog, using all the stars whose visible magnitude is ab...

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Abstract

The invention provides a method for identifying a long-distance space motion target based on stellar map matching. The method comprises the following steps: extracting coordinates of image points of all original images photographed by a visible light camera of a miniature space detector; composing the arranged image points into triangles in a combination mode; reading a star catalogue in the memory of the visible light camera of the miniature space detector, and identifying all triangles formed by the image points by adopting a triangle identification algorithm; and deleting all the identified image points, and remaining the unidentified image points which are image points of the motion target. In the method, the characteristics of relative motion of the visible light camera of the miniature space detector and the motion target is not required to know in advance, the image points of a fixed star are deleted by adopting a star catalogue identification method, and the star catalogue contains all fixed stars in the starry sky, so that the image points of the target can be effectively acquired by adopting the method, and the star catalogue identification method has the advantage of higher interference resistance.

Description

(1) Technical field [0001] The invention relates to aerospace technology, in particular to a method for identifying a long-distance space moving target based on star map matching. (2) Background technology [0002] Micro-spacecraft mainly detect, image and capture moving targets in space (including aircraft with prior information and without prior information). In order to meet the requirements of miniaturization, the detection ability of the visible light camera of the miniature aerospace probe is generally poor, the detection distance, detection range, detection accuracy are very limited, and the calculation ability is limited. In the space environment, the relative motion between the background of the starry sky, the moving target and the detector makes it difficult for the visible light camera of the miniature space probe to identify the moving target. At present, the mainstream algorithms for moving objects in a moving background mainly include inter-frame difference m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06T7/20
Inventor 李葆华陈希军奚伯奇李清华
Owner HARBIN INST OF TECH
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