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A method for extracting solar meridian based on polarization imaging

A solar meridian, polarization imaging technology, applied in the field of astronomical navigation, can solve the problems of small scope of application, difficult to detect and difficult to obtain the symmetry of polarization pattern map, etc.

Active Publication Date: 2021-05-11
DALIAN UNIV OF TECH
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Problems solved by technology

[0004] The above two methods are mainly researched on the sky polarization pattern map obtained in clear weather. In non-clear weather, the symmetry of the former polarization pattern map is difficult to detect, while the latter clustering objects are difficult to obtain due to interference. There are great limitations in use, and the scope of application is small

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  • A method for extracting solar meridian based on polarization imaging
  • A method for extracting solar meridian based on polarization imaging
  • A method for extracting solar meridian based on polarization imaging

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specific Embodiment approach

[0026] A method for extracting the sun's meridian based on polarization imaging, the specific steps are as follows:

[0027] Step 1. Use the all-sky polarization mode test system to collect data, and process to obtain the polarization azimuth mode diagram;

[0028] Step two, such as image 3 As shown, the selection range of the polarization azimuth angle is set (90-a, 90+a), where a is 2, then the selection range of the polarization azimuth angle is (88, 92), which will be as figure 2 The import program of the test polarization azimuth angle pattern diagram shown in Fig. 4(a) can obtain the binary image as shown in Figure 4(a), where the black area is the detected (88, 92) polarization azimuth angle area. The polarization azimuth is symmetrical.

[0029] Step 3. Use the Canny operator to preprocess the edge detection of Figure 4(a), and then use the Hough transform principle to detect and identify the line where the 90-degree polarization azimuth of the binarized image is l...

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Abstract

The invention provides a method for extracting the sun's meridian based on polarization imaging, belongs to the technical field of celestial navigation, and is suitable for extracting effective navigation information from sky polarization pattern diagrams. The existing solar meridian extraction methods are mainly researched on sunny weather, and are not suitable for non-clear weather, and the scope of application is small. According to the characteristic that the polarization azimuth angle on the sun meridian is 90 degrees, the invention uses edge detection and Hough transform algorithm to detect and identify the straight line where the polarization azimuth angle of 90 degrees is located, so as to extract the sun meridian. This method is not easily disturbed by other factors and is suitable for in different weather conditions.

Description

technical field [0001] The invention belongs to the field of astronomical navigation and relates to a method for extracting the sun's meridian based on polarization imaging, which is suitable for extracting effective navigation information from sky polarization pattern diagrams. Background technique [0002] Bionic polarized light navigation has become a new hotspot in the field of navigation technology. Biological research has found that insect navigation is to extract the solar meridian from the whole (or part) of the polarization pattern with stable distribution, and then judge the angle between the solar meridian and the body axis to determine the heading. It can be seen that in the bionic sky polarized light navigation, the acquisition of the sun meridian position information is the key to the polarized light navigation application. [0003] Currently, there are limited methods for extracting the sun's meridian from sky polarization pattern maps. Tian Liu et al. used ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C21/02
CPCG01C21/025
Inventor 崔岩张西光周鑫昌谢楠
Owner DALIAN UNIV OF TECH