Terrestrial free space line of sight optical communication (TFSLSOC) using adaptive control steering system with laser beam Tracking, Aligning and Positioning (ATP)

Raj, A. Arockia Bazil; Selvi, J. Arputha Vijaya; Raghavan, S.

doi:10.1109/icwcsc.2010.5415900

Cited by 11 publications

(8 citation statements)

References 3 publications

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“…The major challenge in the inter-satellite data link is beam pointing between two moving platforms and therefore requires accurate PAT systems. As reported in [97,100], many types of micro-satellites, equipped with lasers for communication and control, are being launched for high-precision earth observation, research, education, telemedicine, military, mapping, navigation, communication, and commercial purposes aiming to make a breakthrough in conventional satellite communication technology. In 2013, lunar laser communication demonstration successfully established a 622 Mbps FSO link between moon and earth.…”

Section: Space Optical Communicationmentioning

confidence: 99%

Historical perspective of free space optical communications: from the early dates to today's developments

Raj

Majumder

2019

IET Communications

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Section: Space Optical Communicationmentioning

confidence: 99%

Historical perspective of free space optical communications: from the early dates to today's developments

Raj

Majumder

2019

IET Communications

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“…Note that the above functions satisfy the equality: σ r (t) + σ l (t) + σ s (t) = 1 for all t. According to (12) and (16), the hysteresis H(u) can be written at any instant of time t as follows ρ u(t)…”

Section: Hysteresis Effectmentioning

confidence: 99%

“…Laser beam jitter control using recursive-least-squares adaptive filters is discussed in [7]. Other interesting contributions to laser alignment, tracking and control may be traced in [8], [9], [10], [11], [12].…”

Section: Introductionmentioning

confidence: 99%

Fast and reliable control of steering mirrors with application to free-space communication

Ibrir

Ooi

et al. 2017

2017 International Conference on Advanced Mechatronic Systems (ICAMechS)

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After modeling a laser beam pointing system actuated by a piezo-electric fast steering mirror (FSM), an observerbased linear feedback controller is developed to correct the position of the laser spot communicated by the position sensing detector (PSD). The modeling and the control actions have been considered with and without the hysteresis effect induced by the piezoelectric actuators of the FSM. The design of the feedback is given through the solution of parametric matrix inequalities. It was found that the integral feedback design is very efficient in handling input and system uncertainty. The linearity of the observer-based feedback has facilitated both the real-time implementation of the control strategy and the proof of stability using dynamic-output feedbacks.

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“…A Free-Space Optical (FSO) communication system consists of a line-of-sight technology which transmits a modulated laser beam through the medium for broadband communications, 1 performed from satellite to satellite, from ground to ground, or from satellite to ground and vice versa. The field of interest at this point of the research is this last scenario: satellite-ground and ground-satellite FSO communications, known from now on as downlink and uplink, respectively.…”

Section: Introductionmentioning

confidence: 99%

Performance assessment of Adaptive Optics techniques on FSO communications through the atmosphere

MartÃnez¹,

Ramos²,

Alonso³

et al. 2017

Proceedings of the Adaptive Optics for Extremely Large Telescopes 5

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Free Space Optical Communications have demonstrated in the recent years to be a feasible alternative to the radiofrequency links due to their advantages in terms of mass, power, cost and flexibility. Since 1995, the Optical Ground Station (OGS) at the Teide Observatory is used by ESA to test laser communication terminals on board of LEO and GEO satellites; however, as one side of the link is settled on the Earth surface, the communication performance will suffer from the effects of the atmosphere presence. The use of adaptive optics in both uplink and downlink, and even the use of Laser guide stars, will then contribute to improve link quality parameters. The approach of pre-correcting the uplink with a Deformable Mirror is also applicable to the Laser Guide Star self-propagating path and the fact a LGS will also narrow its beam with AO correction makes possible a more focused spot with lower magnitude up on the sky. With the aim of designing an Adaptive Optics system in the near future to improve the FSO links at the OGS and possibly the quality of LGSs, turbulence conditions regarding both uplink and downlink have been simulated. Expected performance of a proposed AO system to reduce atmospheric aberrations in both propagating directions is also analysed, as well as the application to LGSs and its advantages in comparison to conventional AO.

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Terrestrial free space line of sight optical communication (TFSLSOC) using adaptive control steering system with laser beam Tracking, Aligning and Positioning (ATP)

Cited by 11 publications

References 3 publications

Historical perspective of free space optical communications: from the early dates to today's developments

Historical perspective of free space optical communications: from the early dates to today's developments

Fast and reliable control of steering mirrors with application to free-space communication

Performance assessment of Adaptive Optics techniques on FSO communications through the atmosphere

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