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Wide-Field-of-Regard Pointing, Acquisition and Tracking-System for small Laser Communication Terminals

Schmidt, Christopher and Horwath, Joachim (2012) Wide-Field-of-Regard Pointing, Acquisition and Tracking-System for small Laser Communication Terminals. In: Proceedings of ICSOS 2012. ICSOS 2012, 9. - 12.10.2012, Ajaccio, France.

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Pointing, Acquisition and Tracking (PAT)-systems are one of the central parts of a Laser Communication Terminal. In Laser Communication Terminals a staggered PAT-system consisting of Coarse Pointing Assembly (CPA) and Fine Pointing Assembly (FPA) is common. The CPA provides a Wide-Field-of-Regard (FoR) and the FPA a precise and fast alignment of the beam to the communication partner. The disadvantage is the mechanical complexity. This paper presents the development challenges of a Wide-Field-of-Regard PAT-system for small Laser Communication Terminals by combining and miniaturizing the functionality of the CPA and FPA to a single actuator. To get a small and lightweight Wide-Field-of-Regard PAT-system, the number of moving parts has to be minimized. Therefore, the system consists of an optical setup that provides a large Field-of-View (FoV) and one single mirror actuator for beam steering – thus, CPA and FPA can be combined in just one moving component. The actuator is controlled by a Digital Signal Processor (DSP). The tracking sensor is a 4-Quadrants-Detector (4QD). During the acquisition mode, the actuator moves in a predefined scan pattern until a signal can be detected on the 4QD. Consequently, the system changes to tracking mode. Our design approach succeeded in a FoR of more than 45° without a traditional CPA. The scan time for the complete FoR is less than 1 second. The block diagram and measurements taken with the prototype in the laboratory will be presented in this paper.

Item URL in elib:https://elib.dlr.de/81034/
Document Type:Conference or Workshop Item (Speech)
Title:Wide-Field-of-Regard Pointing, Acquisition and Tracking-System for small Laser Communication Terminals
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schmidt, Christopherchristopher.schmidt (at) dlr.deUNSPECIFIED
Horwath, Joachimjoachim.horwath (at) dlr.deUNSPECIFIED
Date:October 2012
Journal or Publication Title:Proceedings of ICSOS 2012
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Laser Communication, FSO, Laser Terminal, PAT-System, KNOCGOP
Event Title:ICSOS 2012
Event Location:Ajaccio, France
Event Type:international Conference
Event Dates:9. - 12.10.2012
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Traffic Management (old)
DLR - Research area:Transport
DLR - Program:V VM - Verkehrsmanagement
DLR - Research theme (Project):V - VABENE (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation > Satellite Networks
Deposited By: Schmidt, Christopher
Deposited On:06 Feb 2013 10:09
Last Modified:31 Jul 2019 19:39

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