Senan Rageh, Al-Gobi Mohammed (2020) Study and modeling of vibration sources and turbulence in telecommunications systems based on laser satellites. Doctoral thesis, Université de Batna 2.
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Abstract
Communication is one of the most important things that has received human attention throughout history. The oldest method of communication used by the ancient person to sending smoke signals, beating drums or blowing the trumpet. The first use of signal systems was in Germany and France by telegraph. The first optical communication methods used in the war between France and Austria, by the French engineer “Claude Chabi” and his brothers in 1792. In 1945, the scientist Arthur C. Clarke published an article on the setting of communication satellites in fixed orbits. The idea was applied decades later by the Soviet Union by launching the first Sputnik 1 satellite that was working on radio transmission, after which NASA launched the first communications satellite in the sixties of the last century. Because of the tremendous development in the transmission of information, communication was adopted through the laser satellites, where these are available Technology is a massive flow of information within one second. The biggest problem facing this technique is the atmospheric turbulences that occur when the visual signal passes through the layers of the Earth's atmosphere. This problem appears clearly in the equatorial and tropical regions. To address this problem we use several methods, including the method of adaptive optics. Adaptive optics mainly rely on iterative algorithms in order to build a distorted wavefront in order to modify it and try to return the wave to its natural form. We suggest a solution that allows to reduce the effects of scintillation on phase measurements. Finally, we suggest a stage pre-compensation method especially for measurement and control, which would enable optimal correction implementation. This method has proven effective for improving the wavefront of a laser signal.
| Item Type: | Thesis (Doctoral) |
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| Subjects: | Technologie > Electronique |
| Divisions: | Faculté de technologie > Département d'électronique |
| Date Deposited: | 06 Sep 2020 12:59 |
| Last Modified: | 06 Sep 2020 12:59 |
| URI: | http://eprints.univ-batna2.dz/id/eprint/1851 |
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