Fully optical real-time pointing, acquisition, and tracking system for free space optical link

Ho, Tzung-Hsien; Milner, Stuart D.; Davis, Christophér C.

doi:10.1117/12.590982

Cited by 44 publications

(34 citation statements)

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“…For power-angle simulation model development, the beam is assumed Gaussian; its waist L w at any distance L z is [ (28) where t P is the peak transmission power and r is the radial distance (translation distance) from the optical axis. Beam divergence can also be calculated using OL w :…”

Section: Beam Angle Index Characterizationmentioning

confidence: 99%

“…A number of studies have examined misalignment mitigation [19][20][21][22], building sway [19,23], platform vibrations [24,25], and pointing, acquisition, and tracking (PAT) [14,[26][27][28] for fixed terrestrial FSO links. Some PAT algorithms have also been designed for use in satellite [29], air-to-air (A2A) [30], air-to-ground (A2G) [31] or ground-to-ground (G2G) [9,[32][33][34] mobile FSO links.…”

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confidence: 99%

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Multielement FSO Transceivers Alignment for Inter-UAV Communications

Kaadan

Refai

LoPresti

2014

J. Lightwave Technol.

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Given the increased interest in aerial communications, Free-space Optics (FSO) has gained considerable attention for its ability to deliver wider bandwidth, license-free and secure communication. FSO was initially developed for fixed platforms. As such, the current push to introduce mobility is one of the greatest challenges for FSO developers. This paper presents the first open-loop alignment/stability analysis of hovering multirotors proven to maintain an FSO link despite inherent instability. Communication distance, wavelength, and platform deviation are among the many parameters evaluated in our model. We characterize fiber-bundle transceivers, as an example of optical arrays, and their applicability to aerial FSO communication. Our simulation is based on static lab measurements combined with theoretical analysis and optical geometrical intersection models. Analyses indicated that rotational deviation has a much higher impact on performance than translational deviation. Current commercial multirotor platforms proved adequate for future FSO communication, with 16 to 30% expected throughput when employing suitable optical arrays. We conducted a parametric sweep test to determine optimal and marginal receiver parameters based on platform characteristics and performance metrics. This analysis was conducted and reported as one example of the many applications that our developed mathematical models support.

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Section: Beam Angle Index Characterizationmentioning

confidence: 99%

mentioning

confidence: 99%

Multielement FSO Transceivers Alignment for Inter-UAV Communications

Kaadan

Refai

LoPresti

2014

J. Lightwave Technol.

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“…By digital fine tracking servo compensation, the control information is sent into twodimensional FSM, and thus realizes the closed-loop dynamic tracking. Because of fine tracking CCD with frame rate of more than 3000Hz [5] and FSM with resonant frequency of more than 1600Hz [6] , the fine tracking servo bandwidth can be up to 300Hz. So it can effectively inhibit with the disturbance of wide spectrum.…”

Section: B Fine and Coarse Tracking System Designmentioning

confidence: 99%

Optimization Design and Demonstration of Compound-Axis APT in Airborne Laser Communication

Tong

Song

2012

2012 Symposium on Photonics and Optoelectronics

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A dual-detector and dual-axis compound-axis acquisition, pointing and tracking (APT) scheme of airborne laser communication is proposed, according to the environment and distance of communication link. And a detailed analysis and optimization design of whole optical path structure is carried out. The compound axis consists of Coarse Tracking Assembly (CTA) and Fine Tracking Assembly (FTA). CTA performances a wide range of pointing and tracking, with tracking accuracy of up to 120μrad. However, servo bandwidth of FTA is greater than 300Hz, with dynamic range of 5mrad and tracking accuracy of 4μrad. The plane-to-ground laser communication demonstration experiment is successfully completed with the BER of less than 1E-7.

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“…The previous section introduced the idea that we are able to recover the principal points [Ox, Oy] and some of the extrinsic parameters, such as β*[r 11 , r 12 , tx] and [r 21 , r 22 , ty], using the angle preservation constraint. We show that each calibrated plane is insufficient to provide additional constraints for β and the principal plane as well.…”

Section: Principal Plane Recovery With Pure Rotationmentioning

confidence: 99%

Pointing, acquisition, and tracking system with omnivision

Milner

Davis

2005

SPIE Proceedings

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A free space optical (FSO) network consists of many reconfigurable, directional, high data-rate links. Its performance can be optimized by using topology control algorithms, which involve: (1) potential neighbor information collection, (2) an optimization algorithm with given constraints, and (3) a precise pointing procedure. In general, if a sensor at each node can observe a large field of view (FOV), then more potential link targets can be detected. With more possible link choices, the optimization algorithm will have greater degrees of freedom in determining the optimum topology. The intuitive way to acquire a wide spatial acquisition range is to use a camera with a wide FOV. However, for such a wide angle lens/mirror, there are inevitable large aberrations, which cause errors in a pointing procedure based on image analysis. To mitigate these aberrations, a possible solution is to build a correction procedure from the wide FOV lens imaging model to a pinhole imaging model. In this context, a mapping model is proposed, based on analyses of several wide angle lens sets using CodeV. The proposed model also compensates for the effect of deviations between the center lines of the lens and a CCD imaging array. To obtain the optimum parameters of the model, an off-line calibration procedure based on geometrical constraints is introduced. A sensor system consisting of a widely available fisheye converter (Nikon FC-E8) and a high-resolution CCD camera (1392x1040 pixels) has been built for evaluating the model's performance, as part of our pointing, acquisition and tracking (PAT) system.

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Fully optical real-time pointing, acquisition, and tracking system for free space optical link

Cited by 44 publications

References 0 publications

Multielement FSO Transceivers Alignment for Inter-UAV Communications

Multielement FSO Transceivers Alignment for Inter-UAV Communications

Optimization Design and Demonstration of Compound-Axis APT in Airborne Laser Communication

Pointing, acquisition, and tracking system with omnivision

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