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Research on Star Image Simulation and Star Extraction Method for CCD’s Star Tracker

Author: OuYangZuo
Tutor: ZhangJun；TianJinWen
School: Huazhong University of Science and Technology
Course: Pattern Recognition and Intelligent Systems
Keywords: Star sensor Star Image Simulation Star chart extraction Nebulae and star clusters Geometric distortion Motion blur High-pass filter Dynamic Threshold
CLC: V416
Type: Master's thesis
Year: 2005
Downloads: 772
Quote: 26
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Abstract


Star pattern recognition algorithm with small satellite application technology matures, high accuracy CCD star sensor favored fast and reliable attitude determination system in the most critical part. Because the aerospace experimental expensive, ground of the star sensor debugging software algorithm first simulation, it is impossible to have real-time Star shooting, therefore, necessary for debugging and evaluation of the star pattern recognition algorithm using computer simulation generates star sensor on the ground in real time shooting into the sky pictures. At present, a large number of studies have focused on the star pattern recognition algorithm extracted simulation of star map and star chart relatively less. Therefore, this research work is to extract two aspects of the simulation of star map and star chart. First, extracted at home and abroad on the simulation of star map and star chart Star status quo. More in-depth theoretical analysis, including the following sections: celestial coordinate the CCD plane coordinate conversion; simulated star maps nebulae and star clusters star chart Star wait until the transformation of the gray scale; discussion of several defocus model; ; impact on the star map imaging process a number of factors, such as the cosmic background radiation, the transfer of the CCD device noise output noise, dark current noise and shot noise; images generated after imaging system, geometric distortion and movement blurring . Concrete realization of the process, according to the magnitude for every first-class, brightness increased 2.51 times for the Star \simulation results; simulation and simulation results of nebulae and star clusters; combined with the actual parameters of the satellite and the star map set intervals to discuss whether to produce motion blur and motion blur simulation results ; In addition to the single star chart analog simulation track formula sequence star chart. In addition, analysis of Star Figure Star are into the like and infrared small target image small target that into the image commonality foundation proposed one kind of the high-pass filtering and dynamic threshold value relative combination of star maps in the star's extraction methods, to complete the star chart star map process more time-consuming extraction. I.e., after the first high-pass filtering using the candidate points of the extracted image of the dynamic threshold, the candidate point due to too many false targets, and then through the threshold value of the lowest dynamic secondary extraction. Simulation results show that: This method is compared with the vector method, when the background noise is added not to the star map, the two methods of extraction accuracy is considerable. Once to the star map plus noise, the extraction accuracy of the vector method decreased rapidly, and the extraction accuracy of the proposed method is much higher than the vector method, while the extraction time but with the vector method is almost the same. Therefore, the proposed method showed strong noise immunity.

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CLC: > Aviation, aerospace > Aerospace ( Astronauts ) > Basic theory and experiments > Spacecraft ground test
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