A Point-to-Multi-Point Tracking System for FSO Communication

Kappala, VK and Pradhan, J and Turuk, AK and Silva, VNH and Majhi, S and Das, SK (2021) A Point-to-Multi-Point Tracking System for FSO Communication. In: IEEE Transactions on Instrumentation and Measurement, 70 . pp. 1-10.

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Abstract

Free space optics (FSO) is considered primarily for establishing point-to-point (PtP). However, due to the increasing demand for mobile platforms and mechanisms to establish point-to-multipoint (PtM) connections, this research proposes and implements a novel PtM tracking mechanism for FSO communication. The alignment mechanism consists of two tracking systems, i.e., coarse tracking and fine-tuning. The coarse tracking is responsible to locate FSO transceivers placed at different positions by using magnetometer sensors connected to the cloud. On the other hand, the fine-tuning mechanism overcomes high-frequency amplitude oscillation or jitter with a displacement range of 8 cm. The link is continuously monitored and if the link is lost or not established after a pre-determined time, then the reference line-of-sight (LoS) angle is updated in the cloud to provide an alternate connection. The stability of the closed-loop system is analyzed in terms of root locus and step response. The proposed PtM system is experimentally validated with FSO terminals located at different locations and distances over indoor and outdoor environments. The proposed method achieved an alignment time of less than 5 s for ten degrees of misalignment. © 1963-2012 IEEE.

Item Type:	Journal Article
Publication:	IEEE Transactions on Instrumentation and Measurement
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords:	Alignment; Closed loop systems; Locks (fasteners); Optical links; Phase locked loops; Space optics; Tracking (position); Transceivers, Cloud-computing; Coarse tracking; Fine tuning; Free space optic; Freespace optics; Optic communication; Point to multipoint; Point-to-multipoint; Pointing errors; Tracking system, Optical fibers
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	09 Mar 2023 06:28
Last Modified:	09 Mar 2023 06:28
URI:	https://eprints.iisc.ac.in/id/eprint/80881

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