Rapid Star Extraction and High Accuracy Location in Star Image

2015 ◽  
Vol 12 (8) ◽  
pp. 2929-2937 ◽  
Author(s):  
Jiangbo Xi
Keyword(s):  
High Accuracy ◽  
Star Image

High accuracy star image locating and imaging calibration for star sensor technology

2010 ◽  
Author(s):  
Shaodi Zhang ◽  
Zhijun Zhang ◽  
Honghai Sun ◽  
Yanjie Wang
Keyword(s):  
High Accuracy ◽  
Sensor Technology ◽  
Star Sensor ◽  
Star Image

scholarly journals A SLIC-DBSCAN Based Algorithm for Extracting Effective Sky Region from a Single Star Image

Sensors ◽  
2021 ◽  
Vol 21 (17) ◽  
pp. 5786
Author(s):  
Chenguang Shi ◽  
Rui Zhang ◽  
Yong Yu ◽  
Xingzhe Sun ◽  
Xiaodong Lin
Keyword(s):  
Clustering Algorithm ◽  
Spatial Clustering ◽  
Saliency Map ◽  
High Accuracy ◽  
Star Tracker ◽  
Single Image ◽  
Large Area ◽  
Single Star ◽  
Star Image ◽  
Simple Linear Iterative Clustering

The star tracker is widely used for high-accuracy missions due to its high accuracy position high autonomy and low power consumption. On the other hand, the ability of interference suppression of the star tracker has always been a hot issue of concern. A SLIC-DBSCAN-based algorithm for extracting effective information from a single image with strong interference has been developed in this paper to remove interferences. Firstly, the restricted LC (luminance-based contrast) transformation is utilized to enhance the contrast between background noise and the large-area interference. Then, SLIC (the simple linear iterative clustering) algorithm is adopted to segment the saliency map and in this process, optimized parameters are harnessed. Finally, from these segments, features are extracted and superpixels with similar features are combined by using DBSCAN (density-based spatial clustering of applications with noise). The proposed algorithm is proved effective by successfully removing large-area interference and extracting star spots from the sky region of the real star image.

scholarly journals Accurate and Autonomous Star Acquisition Method for Star Sensor under Complex Conditions

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Hao Zhang ◽  
Yanxiong Niu ◽  
Jiazhen Lu ◽  
He Zhang
Keyword(s):  
Frequency Domain ◽  
Laboratory Experiments ◽  
High Accuracy ◽  
Nonlinear Filter ◽  
Attitude Measurement ◽  
Star Sensor ◽  
Excellent Performance ◽  
Star Image ◽  
Image Simulations ◽  
Acquisition Method

Star sensor is a preferred attitude measurement device for its extremely high accuracy. Star acquisition is the essential and critical procedure, which is aiming at acquiring accurate star areas. However, degenerated acquisition results under complex conditions become one of the major restrictions for modern star sensor. In this paper, an accurate and autonomous star acquisition method is proposed. Mathematical morphology and variable thresholding are combined for accurate star extraction; motion PSF is estimated in frequency domain and nonlinear filter is adopted for star restoration. Accurate star acquisition can be achieved based on only one star image. Simulations and laboratory experiments are conducted for verification. Several existing methods are also reproduced for comparison. Acquisition results demonstrate that the proposed method is effective and an excellent performance can be achieved autonomously under complex conditions, along with more detected stars and improved acquisition accuracy.

High-Accuracy Star Sensor Centroid Algorithm Based on Star Image Resampling

2019 ◽  
Vol 39 (7) ◽  
pp. 0712003
Author(s):  
曹阳 Yang Cao ◽  
李保权 Baoquan Li ◽  
李海涛 Haitao Li ◽  
桑鹏 Peng Sang
Keyword(s):  
High Accuracy ◽  
Star Sensor ◽  
Star Image ◽  
Centroid Algorithm

scholarly journals A Star Image Extractor for the Nano-JASMINE satellite

2007 ◽  
Vol 3 (S248) ◽  
pp. 294-295
Author(s):  
M. Yamauchi ◽  
N. Gouda ◽  
Y. Kobayashi ◽  
T. Tsujimoto ◽  
T. Yano ◽  
...  
Keyword(s):  
Control System ◽  
Real Time ◽  
Attitude Control ◽  
Image Data ◽  
High Accuracy ◽  
Attitude Control System ◽  
Image Processor ◽  
Star Image ◽  
Real Time Image ◽  
Time Image

AbstractWe have developped a software of Star-Image-Extractor (SIE) which works as the on-board real-time image processor. It detects and extracts only the object data from raw image data. SIE has two functions: reducing image data and providing data for the satellite's high accuracy attitude control system.

A New 1,000 kV Electron Microscope

1967 ◽  
Vol 25 ◽  
pp. 260-261
Author(s):  
M. Nishigaki ◽  
S. Katagiri ◽  
H. Kimura ◽  
B. Tadano
Keyword(s):  
Electron Microscope ◽  
High Voltage ◽  
Basic Research ◽  
Chromatic Aberration ◽  
High Accuracy ◽  
Biological Specimen ◽  
Voltage Electron ◽  
High Voltage Electron Microscope ◽  
High Voltage Electron

The high voltage electron microscope has many advantageous features in comparison with the ordinary electron microscope. They are a higher penetrating efficiency of the electron, low chromatic aberration, high accuracy of the selected area diffraction and so on. Thus, the high voltage electron microscope becomes an indispensable instrument for the metallurgical, polymer and biological specimen studies. The application of the instrument involves today not only basic research but routine survey in the various fields. Particularly for the latter purpose, the performance, maintenance and reliability of the microscope should be same as those of commercial ones. The authors completed a 500 kV electron microscope in 1964 and a 1,000 kV one in 1966 taking these points into consideration. The construction of our 1,000 kV electron microscope is described below.

Application Of BIM-Technology In The Restoration Of Buildings

2020 ◽  
pp. 42-48
Keyword(s):  
Chinese Communist Party ◽  
Laser Scanning ◽  
High Accuracy ◽  
Information Environment ◽  
Information Modeling ◽  
Structural Scheme ◽  
Traditional Design ◽  
Information Interaction ◽  
Heritage Buildings ◽  
Effective Organization

The paper describes the main trends in the development of BIM technologies in the field of restoration and reconstruction of historical and cultural heritage buildings. The practical part of the paper presents the experience in using information modeling technologies when restoring the building, where the VI Congress of the Chinese Communist Party in Moscow took place. The use of laser scanning technologies made it possible to reproduce with high accuracy in the information model the original appearance of the building using Autodesk RevitR software. It is shown, how the use of information modeling technologies affects the duration of restoration process, taking into account the calculation of the structural scheme and bearing structures of the building, ensuring the identity of the decoration and the effective organization of electromechanical installation. Operating in a single BIM information environment makes it possible to continuously obtain reliable information on the project, which provides more effective information interaction and communication of participants compared to using traditional design methods.

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