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All-time star sensor star point extraction method based on multi-frame accumulation algorithm

A technology of multi-frame accumulation and star point extraction, which is applied in the field of star map recognition, can solve the problems of increasing the number of extracted star points, low signal-to-noise ratio, and difficulty in target extraction, and achieves the enhancement of weak star grayscale and signal-to-noise ratio, The effect of enhancing the signal-to-noise ratio and enhancing the star point signal-to-noise ratio

Active Publication Date: 2020-05-01
SHANGHAI AEROSPACE CONTROL TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problem of difficult target extraction caused by low signal-to-noise ratio of star sensors during daytime measurement, the present invention proposes an all-time star sensor star point extraction method based on a multi-frame accumulation algorithm, which can improve the signal-to-noise ratio of star maps, Increase the number of extracted star points while obtaining high-precision centroid and energy information

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  • All-time star sensor star point extraction method based on multi-frame accumulation algorithm
  • All-time star sensor star point extraction method based on multi-frame accumulation algorithm
  • All-time star sensor star point extraction method based on multi-frame accumulation algorithm

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Embodiment 1

[0045] Embodiment one: see figure 1 As shown, for the original star map to be processed, embodiments of the present invention provide a method for extracting star points of star sensors based on multi-frame accumulation algorithm, including the following steps:

[0046] Step 1: Star map denoising.

[0047]Step 2: Preliminary superposition of continuous star maps. The cumulative star map can be obtained by superimposing n frames of continuous denoising star maps at the pixel level (n should not be too large, and its value is related to the platform movement speed). The star point signal in a single frame star map is distributed on multiple pixels. Due to the change of shooting conditions, the signal position of the same star point in the star map between adjacent frames will shift, and the star point signal in the star map after accumulation The size of the diffuse spot will further expand.

[0048] Step 3: Downsampling of the star map. The accumulated star map generated in...

Embodiment 2

[0087] Embodiment 2: The difference between this embodiment and the all-time star sensor star point extraction method based on the multi-frame accumulation algorithm described in Embodiment 1 is that the image denoising algorithm adopts other denoising algorithms except the median subtraction denoising algorithm , such as median filter, Wiener filter, etc.

Embodiment 3

[0088] Embodiment three: the difference between this embodiment and the all-time star sensor star point extraction method based on the multi-frame accumulation algorithm described in embodiment one is that the connected domain division algorithm selects other star point coarse positioning algorithms, such as based on line marking connected domain extraction method.

[0089] The basic processing unit of the connected domain extraction method based on the line labeling method is a straight line segment. Firstly, the binary star image is scanned line by line. When a straight line of the current line is scanned (consisting of pixels with a continuous gray value of "1") each time, the straight line has been detected in the previous line. Segments are judged for connectivity, and if the connectivity rules are satisfied, they will be merged.

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Abstract

The invention provides an all-time star sensor star point extraction method based on a multi-frame accumulation algorithm. The method comprises the following steps of firstly, denoising a detection star map of a star sensor; then, carrying out preliminary superposition operation on the continuous multi-frame denoised star map; reducing a star point signal area in a sampling image down-sampling mode; determining the position of the star point in the down-sampling star map by utilizing a seed extraction method; and extracting star points by using a sampling connected domain method, classifying the star points after multi-frame superposition, calculating star point offset, correcting the star point positions to obtain a multi-frame accumulated star map, extracting the multi-frame accumulatedstar points by using the sampling connected domain method again, and finally verifying the extracted star points by taking the signal-to-noise ratio as a criterion. The star point extraction method issuitable for star maps with low signal-to-noise ratios, and has the advantages of obvious improvement of star map contrast, high star point positioning precision and the like.

Description

technical field [0001] The invention relates to the field of star map recognition, and more specifically, relates to a method for extracting star points of an all-time star sensor based on a multi-frame accumulation algorithm. Background technique [0002] The star sensor is a high-precision attitude-sensitive measuring instrument. It images the starry sky through an optical system, measures the component of the star vector in the star sensor coordinate system, and uses the known precise position of the star to determine the carrier relative to the inertial coordinate system. triaxial attitude. Generally speaking, the star sensor as a photometric device is greatly affected by the background stray light, so it can only be used for outer space or night star measurement. With the development of star navigation technology, the requirements for star sensors are getting higher and higher, and the all-day star sensors with night and daytime star measurement capabilities are gradua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C21/02
CPCG01C21/025
Inventor 郑循江叶志龙孙朔冬高原叶宋杭吴迪何峰武斌吕进剑
Owner SHANGHAI AEROSPACE CONTROL TECH INST