Method for star point extracting of navigational star in cloud environment in daytime

A technology for extracting star points and navigating stars, applied in navigation, astronomical navigation, mapping and navigation, etc., can solve problems such as inability to extract star points

Active Publication Date: 2017-12-22
BEIJING INST OF CONTROL ENG
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Problems solved by technology

[0014] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to provide a method for extracting navigation star points in a cloudy environmen

Method used

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  • Method for star point extracting of navigational star in cloud environment in daytime
  • Method for star point extracting of navigational star in cloud environment in daytime
  • Method for star point extracting of navigational star in cloud environment in daytime

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Embodiment Construction

[0074] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0075] like figure 1 As shown, the specific implementation steps of a method for extracting star points under a cloudy daytime environment provided by the present invention are as follows:

[0076] (1) After the star sensor is aligned with a certain sky area, N frames of star images are continuously captured, and the star image preprocessing is performed on the N frames of original daytime cloud star images continuously captured by the star sensor to filter out cloud interference and background noise. , in general, the N is greater than or equal to 5;

[0077] The preprocessing process of the star map is as follows:

[0078] (1.1) Using the improved TopHat filtering method for the original daytime cloud star map to suppress cloud interference and background noise, and obtain the first star map;

[0079] The specific implementation of the imp...

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Abstract

The present invention provides a method for star point extracting of a navigational star in cloud environment in daytime, and the method comprises firstly, respectively performing the following operation on each frame of star map of a plurality of frames of daytime cloud star maps which are consecutively taken: (1) using an improved morphological TopHat operator to filter an original start map to obtain a first star map; (2) using a RobinsonGuard filter to filter the first star map to obtain a second star map; (3) using an adaptive threshold method for threshold cutting of the second star map, and storing coordinates and grayscales of all pixels higher than a threshold; and (4) using a clustering method for four-connected domain star point extracting; secondly using a multiframe comparison technique to eliminate pseudo-star points in the connected domain extracted from each frame of star map; and thirdly, calculating the centre of mass of each successfully-compared connected domain to complete the star point extraction. The method can effectively eliminate the interference of daytime sky clouds and other backgrounds, meanwhile avoids mistaken extraction caused by dust and other air floating objects, and ensures the effective and stable star point extraction.

Description

technical field [0001] The invention relates to a method for extracting navigation star points in a cloudy daytime environment, which is applied to the field of star map processing of near-ground platforms such as aircraft, missiles, ships and near-space vehicles. Background technique [0002] The star sensor is a high-precision attitude measuring instrument with stars as the measurement reference source. It has the advantages of high precision and strong autonomy, and has been widely used in space vehicles such as satellites and spacecraft. At present, most typical star sensors work in the cold and dark background and in the visible spectrum. Faced with the all-day navigation requirements of aircraft, missiles, ships and other platforms in the atmosphere and near-Earth space, due to the strong background light of the sky in daytime conditions , the traditional star sensor star point extraction technology can not meet the requirements. [0003] The day star sensor works in ...

Claims

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Application Information

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IPC IPC(8): G01C21/02
CPCG01C21/025
Inventor 徐卿赵春晖李全良孙秀清王立李晓曹中祥
Owner BEIJING INST OF CONTROL ENG
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