2017 IEEE International Conference on Space Optical Systems and Applications (ICSOS), 2017
In this paper we investigate the effect of scintillation on both long and short range modulating ... more In this paper we investigate the effect of scintillation on both long and short range modulating retroreflector (MRR) based links and present ways to mitigate these effects. The long range scenario investigated is that of a high-altitude platform-to-ground link, but is extensible to low earth orbit (LEO) satellite-to-ground links. In the first approach, a phase screen model is used to quantify the reduction in scintillation by using multiple MRRs. In a second approach, the performance of FPGA-based optical communication modems using channel coding to combat optical fading are investigated using laboratory synthesised scintillation noise based on the phase screen simulation predictions.
Abstract. Free space optical communications (FSOC) systems are a promising complement to existing... more Abstract. Free space optical communications (FSOC) systems are a promising complement to existing wireless communications technologies. FSOC systems have many significant advantages over traditional radio frequency links, including high bandwidth, no spectrum licensing requirements, low-power consumption, small payloads, low probability of intercept, and greater immunity from interference or jamming. However, atmospheric turbulence (scintillation) imparts significant phase noise onto the laser beam, resulting in intensity fluctuations at the receiver. In order to develop scintillation mitigation strategies, it is necessary to monitor scintillation in parallel to the communications channel. We report on the development and implementation of a robust angle of arrival (AoA) turbulence measurement instrument that is suitable for this task. Several key data acquisition and processing techniques were designed to enhance the reliability and robustness of the scintillation measurement.
2017 IEEE International Conference on Space Optical Systems and Applications (ICSOS), 2017
In this paper we investigate the effect of scintillation on both long and short range modulating ... more In this paper we investigate the effect of scintillation on both long and short range modulating retroreflector (MRR) based links and present ways to mitigate these effects. The long range scenario investigated is that of a high-altitude platform-to-ground link, but is extensible to low earth orbit (LEO) satellite-to-ground links. In the first approach, a phase screen model is used to quantify the reduction in scintillation by using multiple MRRs. In a second approach, the performance of FPGA-based optical communication modems using channel coding to combat optical fading are investigated using laboratory synthesised scintillation noise based on the phase screen simulation predictions.
Abstract. Free space optical communications (FSOC) systems are a promising complement to existing... more Abstract. Free space optical communications (FSOC) systems are a promising complement to existing wireless communications technologies. FSOC systems have many significant advantages over traditional radio frequency links, including high bandwidth, no spectrum licensing requirements, low-power consumption, small payloads, low probability of intercept, and greater immunity from interference or jamming. However, atmospheric turbulence (scintillation) imparts significant phase noise onto the laser beam, resulting in intensity fluctuations at the receiver. In order to develop scintillation mitigation strategies, it is necessary to monitor scintillation in parallel to the communications channel. We report on the development and implementation of a robust angle of arrival (AoA) turbulence measurement instrument that is suitable for this task. Several key data acquisition and processing techniques were designed to enhance the reliability and robustness of the scintillation measurement.
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Papers by Sean Manning