Pointing, acquisition, and tracking system with omnivision

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

doi:10.1117/12.617611

Cited by 10 publications

(7 citation statements)

References 9 publications

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“…In addition, since wide-angle cameras provide distorted images on an imaging array, this distortion must be corrected to allow the illuminate pixel in an imaging array to provide correct angular information to the beam steering system that point the transceiver to a distant node. Further details of the beacon-based pointing process involving coordinate transformations and distortion correction are available elsewhere [36][37][38].…”

Section: Pointing With the Aid Of Optical Beaconsmentioning

confidence: 99%

Autonomous reconfiguration and control in directional mobile ad hoc networks

Milner

Llorca

Davis

2009

IEEE Circuits Syst. Mag.

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Requirements for increasingly complex, scalable, and dynamic wireless networks, which provide assured end-to-end broadband connectivity in a wide range of scenarios, have been emerging. In this context, we have been investigating wireless technologies that provide extremely high data rates through the use of narrow-beam free space optical (FSO) and/or radio-frequency (RF) pointto-point links. The use of directional wireless communications to form flexible backbone networks, which provide broadband connectivity to capacity-limited wireless networks or hosts using omnidirectional transmission, promises to circumvent the scalability limitations of traditional flat wireless networks.We have been investigating backbones of base stations, in which topologies and mobility can be controlled for purposes of assured communications.

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Section: Pointing With the Aid Of Optical Beaconsmentioning

confidence: 99%

Autonomous reconfiguration and control in directional mobile ad hoc networks

Milner

Llorca

Davis

2009

IEEE Circuits Syst. Mag.

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“…A fish-eye lens can be employed to satisfy a large FOV requirement since it can cover a hemisphere [10]. In fact, several starting acquisition approaches using a fish-eye lens imaging system have been presented [11][12][13][14]. Also, we have presented an acquisition approach by using of a wide-angle lens array to realize a large FOV [15].…”

Section: Introductionmentioning

confidence: 99%

Spatial acquisition scheme with ultrawide FOV for atmospheric optical links: based on a fish-eye lens and a sinusoidal amplitude grating

Ma¹

2015

Appl. Opt.

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We present a spatial acquisition scheme based on a fish-eye lens and a sinusoidal amplitude grating that can acquire laser beacons in an ultrawide field of view for atmospheric optical links. In this scheme, an incoming laser beacon can be imaged into three diffraction spots. The laser direction and the wavelength can be measured from the center position of the spots and the distance between two adjacent spots, respectively. The total optical transfer function can be described by the combined effect of the acquisition system itself and the spatial coherence degradation due to atmospheric turbulence. Spot spread and spot dancing effects are both considered for longterm exposure and short-term exposure. We investigate how root mean square errors of the measured laser direction and wavelength vary with the ratio of the pupil diameter D 2 to atmospheric coherence length r 0 , without consideration of aberrations of the fish-eye lens. The results show that with the limitation of r 0 the performance cannot be infinitely improved by enlarging D 2 . When considering aberrations of the fish-eye lens, the imaged spot is gradually blurred and deteriorated with the increase of the field angle, since aberrations are enlarged with the increase of the field angle. We study how the measured errors of laser direction and wavelength vary with r 0 and incident angles (with different aberrations). A severe turbulence with a small value of r 0 and a large incident angle will cause a bad acquisition performance.

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“…However, this array scheme is hard to realize because of its complex structure and high cost. An alternative scheme using fisheye lens was investigated [7], [8]. One fisheye lens can cover a hemisphere, thus a few of it can provide 360°FOV.…”

Section: Introductionmentioning

confidence: 99%

High-Accuracy Angle Detection for the Ultrawide FOV Acquisition Scheme in Free-Space Optical Links

Liu

Chen

et al. 2014

J. Lightwave Technol.

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To achieve rapid establishment of free-space optical (FSO) links, we previously proposed an ultrawide field-of-view (FOV) acquisition scheme, which combines the fisheye lens and Voigt anomalous dispersion optical filter. In this paper, we focus on the angle detection accuracy of this ultrawide FOV acquisition scheme, which is one of primary factors for rapid establishment of FSO links. The positioning process is composed of two parts. One is the spot location, which acquires the position of the imaging spot of the incident beam. The other is the mapping from spot location to incident angle, with which the position of imaging spot can be turned into the angles of the incident beam. For the first part, an improved centroid locating algorithm is present to realize the subpixel accuracy of spot location, and theory and simulation are carried out to demonstrate the improved accuracy of this algorithm. For the second part, we propose the fisheye lens calibration algorithm, which integrates the fisheye lens projection model and natural neighbor interpolation algorithm. In addition, by combining with the measured data, the angle detection accuracy of this method can be improved gradually with the increased number of the measured data. The simulation results indicate that this new method can provide high-precision positioning of the laser beams, and the maximum angle detection error of this ultrawide FOV acquisition scheme can be less than 0.054°(0.94 mrad).Index Terms-Fisheye lens calibration, free space optical link, high-accuracy angle detection, spot location, ultrawide field-ofview acquisition. 0733-8724

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Pointing, acquisition, and tracking system with omnivision

Cited by 10 publications

References 9 publications

Autonomous reconfiguration and control in directional mobile ad hoc networks

Autonomous reconfiguration and control in directional mobile ad hoc networks

Spatial acquisition scheme with ultrawide FOV for atmospheric optical links: based on a fish-eye lens and a sinusoidal amplitude grating

High-Accuracy Angle Detection for the Ultrawide FOV Acquisition Scheme in Free-Space Optical Links

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