Unlock instant, AI-driven research and patent intelligence for your innovation.

A star point extraction method for all-time star sensor based on multi-frame accumulation algorithm

A multi-frame accumulation, star point extraction technology, applied in the field of star map recognition, can solve the problems of increasing the number of extracted star points, difficulty in target extraction, low signal-to-noise ratio, etc. Noise ratio, the effect of filtering out noise interference

Active Publication Date: 2021-09-07
SHANGHAI AEROSPACE CONTROL TECH INST
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A star point extraction method for all-time star sensor based on multi-frame accumulation algorithm
  • A star point extraction method for all-time star sensor based on multi-frame accumulation algorithm
  • A star point extraction method for all-time star sensor based on multi-frame accumulation algorithm

Examples

Experimental program
Comparison scheme
Effect test

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.

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

No PUM Login to View More

Abstract

The invention provides a method for extracting star points of an all-time star sensor based on a multi-frame accumulation algorithm. First, denoise the detected star map of the star sensor, and then perform a preliminary superposition operation on the denoised star map of consecutive multi-frames, and sample the image down-sampling method to narrow the star point signal area, and then use the seed extraction method to determine the star point In the position of the downsampling star map, the sampling connected domain method extracts star points and classifies the star points after multi-frame superimposition, then calculates the star point offset and corrects the star point position, and obtains the star map after multi-frame accumulation, and The method of re-sampling the connected domain extracts the star points after multi-frame accumulation, and finally uses the signal-to-noise ratio as a criterion to verify the extracted star points. The star point extraction method of the present invention is suitable for a star map with a low signal-to-noise ratio, and has the advantages of obvious star map contrast improvement, high star point positioning accuracy, 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

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
no application Login to View More
Patent Type & Authority Patents(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