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RISS 인기검색어
- 검색키워드
- 저자 : C. Couder-Castañeda (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Prototype of a Computer Vision-Based CubeSat Detection System for Laser Communications
I. Medina,J. J. Hernández-Gómez,C. R. Torres-San Miguel,L. Santiago,C. Couder-Castañeda 한국항공우주학회 2021 International Journal of Aeronautical and Space Sc Vol.22 No.3
Up to now, CubeSat nano-satellites have strong limitations in communication data rates (∼100 ∼100 kbps) and bandwidth due to the strictness of CubeSat standard. However, if they could be endowed with optical communications (data rates up to 1 Gbps in optimal state), CubeSat applications would exponentially increase. Nonetheless, laser communications face some important drawbacks as the development of a very strict and accurate tracking mechanism. This work proposes an on-board fine pointing system to locate an optical ground station beacon using an embedded system complying with the restrictive CubeSat standard. Such on-board fine pointing system works based on computer vision. The experimental prototype is implemented in Matlab/Simulink, within a Raspberry Pi 3B. The main outcome is the usage of off-the-shelf components (COTS), obtaining an efficient tracking with low power consumption in very noisy and reflective environments. The developed system proves to be fast, stable and strong. It also satisfies the strict size and power consumption restrictions of CubeSat standard.
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Fine Pointing and Tracking Onboard System for CubeSat Optical Satcom
I. Medina,J. J. Hernández-Gómez,C. Couder-Castañeda 한국항공우주학회 2023 International Journal of Aeronautical and Space Sc Vol.24 No.5
Satellite data transmissions are complex due to the various factors that intervene in them. Many institutions have opted for laser communications in search of high data transmission rates, reduced size and weight, lower costs, and low power consumption, unlike radio-frequency communications. However, optical links require tremendously precise pointing and tracking since poor pointing can yield connection errors. Thus, fine pointing is required, with the ability to redirect the transceptor with exceptionally delicate motions, allowing a stable link within the sight window. In this work, the development of a pointing, acquisition, and tracking subsystem consisting of a computer vision system is presented, capable of recognising and detecting a guide beam emitted by an optical ground station, together with a fuzzy logic controller for servomotors to perform the tracking phase. The fine-pointing system was implemented on a printed circuit board for a trouble-free and adequate interface to communicate with any microprocessor. The outcome shows that the system can follow and identify the indicated beam amongst many other light sources at short and long distances. Likewise, the pointing accuracy was found to be within the same order of magnitude as the minimum required, showing that an onboard active tracking system for laser communications within a CubeSat is feasible. Ultimately, this research serves as an alternative method for the future development of affordable narrow-beam tracking systems for nanosatellite applications.
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