Minimization of acquisition time in a wavelength diversified FSO link between mobile platforms

Harris, Alan; Giuma, T.A.

doi:10.1117/12.719661

Cited by 7 publications

(3 citation statements)

References 10 publications

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“…Lot of work has been carried out for optimization of acquisition time in case of inter-satellite/ground-to-satellite optical link [206]- [211] as it determines the performance of the acquisition system. In [212], a wavelength diversified FSO link consisting of three wavelengths i.e., 1.55 µm, 0.85 µm and 10 µm has been modeled from ground to mobile aerial platform communication. Based on the transmission properties, a method for minimizing link acquisition times through the exploitation of various properties of each wavelength was analyzed.…”

Section: Acquisition Tracking and Pointingmentioning

confidence: 99%

Optical Communication in Space: Challenges and Mitigation Techniques

Kaushal

Kaddoum

2017

IEEE Commun. Surv. Tutorials

1,355

721

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Abstract-In recent years, free space optical (FSO) communication has gained significant importance owing to its unique features: large bandwidth, license free spectrum, high data rate, easy and quick deployability, less power and low mass requirements. FSO communication uses optical carrier in the near infrared (IR) band to establish either terrestrial links within the Earth's atmosphere or inter-satellite/deep space links or ground-to-satellite/satellite-to-ground links. It also finds its applications in remote sensing, radio astronomy, military, disaster recovery, last mile access, backhaul for wireless cellular networks and many more. However, despite of great potential of FSO communication, its performance is limited by the adverse effects (viz., absorption, scattering and turbulence) of the atmospheric channel. Out of these three effects, the atmospheric turbulence is a major challenge that may lead to serious degradation in the bit error rate (BER) performance of the system and make the communication link infeasible. This paper presents a comprehensive survey on various challenges faced by FSO communication system for ground-to-satellite/satellite-to-ground and inter-satellite links. It also provide details of various performance mitigation techniques in order to have high link availability and reliability. The first part of the paper will focus on various types of impairments that pose a serious challenge to the performance of optical communication system for ground-to-satellite/satellite-to-ground and inter-satellite links. The latter part of the paper will provide the reader with an exhaustive review of various techniques both at physical layer as well as at the other layers (link, network or transport layer) to combat the adverse effects of the atmosphere. It also uniquely presents a recently developed technique using orbital angular momentum for utilizing the high capacity advantage of optical carrier in case of space-based and near-Earth optical communication links. This survey provides the reader with comprehensive details on the use of space-based optical backhaul links in order to provide high capacity and low cost backhaul solutions.

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Section: Acquisition Tracking and Pointingmentioning

confidence: 99%

Optical Communication in Space: Challenges and Mitigation Techniques

Kaushal

Kaddoum

2017

IEEE Commun. Surv. Tutorials

1,355

721

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“…The authors in [11] investigated the acquisition problem in free-space optical communications, determined the upper bounds on the mean acquisition time, minimized it numerically with respect to the beam radius, and derived the complementary distribution function of an upper bound on acquisition time in a closed-form. The study in [12] presented an approach for minimizing optical link acquisition times by exploiting various wavelength-specific features. One article [13] considers adaptive acquisition schemes for photon-limited channels in free-space optical communications.…”

Section: B Literature Review On Acquisition In Free-space Optical Com...mentioning

confidence: 99%

Lidar-Assisted Acquisition of Mobile Airborne FSO Terminals in a GPS-Denied Environment

Bashir¹,

Heyou²,

Alouini³

2023

Preprint

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<p>For acquisition of narrow-beam free-space optical (FSO) terminals, a Global Positioning System (GPS) is typically required for coarse localization of the terminal. However, the GPS signal may be shadowed, or may not be present at all, especially in rough or unnameable terrains. In this study, we propose a lidar-assisted acquisition of an unmanned aerial vehicle (UAV) for FSO communications in a poor GPS environment. Such an acquisition system consists of a lidar subsystem and an FSO acquisition subsystem: The lidar subsystem is used for coarse acquisition of the UAV, whereas, the FSO subsystem is utilized for fine acquisition to obtain the UAV's accurate position. This study investigates the optimal allocation of energy between the lidar and FSO subsystems to minimize the acquisition time. Here, we minimize the average acquisition time, and maximize the cumulative distribution function of acquisition time for a fixed threshold. We learn that an optimal value of the energy allocation factor exists that provides the best performance of the proposed system. </p>

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“…If during the coarse-pointing stage, the uncertainty area of a UAV is wider than the typical beam-divergence angle, then a ground station scans the area so that the UAV can receive the beacon beam [14]. In practice, GPS information provides position information within an uncertainty range of a few meters.…”

Section: Closed-form Angle Estimatormentioning

confidence: 99%

RF Lens Antenna Array-Based One-Shot Coarse Pointing for Hybrid RF/FSO Communications

Moon¹,

Jeon²,

Chae³

2021

Preprint

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Because of its high directivity, free-space optical (FSO) communication offers a number of advantages. It can, however, give rise to major system difficulties concerning alignment between two terminals. During the link-acquisition step (a.k.a. coarse pointing), a ground station can be prevented from acquiring optical links due to pointing errors and insufficient information about unmanned aerial vehicle locations. We propose, in this letter, a radio-frequency (RF) lens antenna array to increase the performance of coarse pointing in hybrid RF/FSO communications. The proposed algorithm using a novel closedform angle estimator, compared to conventional methods, reduces the minimum outage probability by over a thousand times.

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Minimization of acquisition time in a wavelength diversified FSO link between mobile platforms

Cited by 7 publications

References 10 publications

Optical Communication in Space: Challenges and Mitigation Techniques

Optical Communication in Space: Challenges and Mitigation Techniques

Lidar-Assisted Acquisition of Mobile Airborne FSO Terminals in a GPS-Denied Environment

RF Lens Antenna Array-Based One-Shot Coarse Pointing for Hybrid RF/FSO Communications

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