Novel laser communications transceiver with internal gimbal-less pointing and tracking

Chalfant, Charles H.; Orlando, Fred J.; Gregory, Jeff T.; Sulham, Clifford V.; O'Neal, Chad B.; Taylor, G.W.; Craig, Douglas M.; Foshee, James J.; Lovett, J. Timothy

doi:10.1117/12.453547

Cited by 6 publications

(2 citation statements)

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“…Typical pointing accuracies for laser satellite communications (LSC) systems vary from 1 to 200 rad; however most typical systems have a pointing accuracy within the range of 10 to 50 rad. In the tracking phase, the current values of accuracies typically reach 1 to 3 rad [4,5]. Lasercom links from low Earth orbit (LEO) to ground present several unique challenges for PAT.…”

Section: Introductionmentioning

confidence: 99%

Error Assessment Model for the Inverse Kinematics Problem for Stewart Parallel Mechanisms for Accurate Aerospace Optical Linkage

Hernández-Gómez

Medina

Miguel

et al. 2018

Mathematical Problems in Engineering

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In this work we develop a mathematical model to estimate the error for inverse kinematics problem for Gough-Stewart parallel mechanisms. We propose the estimation error method to include manufacture, assembly, backlash, and sensing errors. We provide the error transmission matrices for the length of each leg of the hexapod, which permits evaluation of the accuracy error in the position of each one, given a desired position and orientation of the mobile platform. We also present numerical modelling in order to estimate the accuracy of the methodology herein proposed, for specific attitude operations corresponding to performing a successful ground-LEO nanosatellite optical link. In such a case, we were able to provide the required tolerances for the actuators in order to guarantee an orientation precision requirement of the order of milliradians.

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Section: Introductionmentioning

confidence: 99%

Error Assessment Model for the Inverse Kinematics Problem for Stewart Parallel Mechanisms for Accurate Aerospace Optical Linkage

Hernández-Gómez

Medina

Miguel

et al. 2018

Mathematical Problems in Engineering

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“…However, in tunnels Transceivers are mounted on top of the ceiling. Finally, precise acquisition, pointing, and tracking (APT) system can improve the stability of the link between ground and train [32]. Proposed mathematical G2T FSO models [29]- [31] had different characteristics in terms of propagated beam profile, track configurations, and channel losses.…”

Section: Overeview Of G2t Fso Communications Fso G2t Systemmentioning

confidence: 99%

FSO G2T communications in tropical climate: An overview

Mabrouk

Abdullah

2017

AIP Conference Proceedings

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Abstract.As the demand for high-speed broadband data access on trains increases, so does the interest in finding solutions to satisfy this demand. This paper aims to provide an overview of Free Space Optical (FSO) Link for Ground-to-Train Communication(G2T). It focuses on tropical climate, with illustrations of the technology Challenges, and opportunities. Railway communication challenges are discussed with recent research work. Additionally, FSO G2T modeling techniques for various track configurations are briefly discussed and summarized.

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