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Accuracy analysis of a mobile tracking system for angular position determination of flying targets

Walther, Andreas and Buske, Ivo and Riede, Wolfgang (2016) Accuracy analysis of a mobile tracking system for angular position determination of flying targets. In: Proceedings of SPIE - The International Society for Optical Engineering, 9989, 99890T-99890T. SPIE Remote Sensing and Security + Defence, 26.-29. Sep. 2016, Edinburgh, Schottland, UK. doi: 10.1117/12.2241211.

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Official URL: http://dx.doi.org/10.1117/12.2241211


Lasers arouse an increasing interest in remote sensing applications. In order to deliver as much as possible of the available laser power onto a flying object the subsystems of a beam control system have to operate precisely together. One important subsystem is responsible for determination of the target’s angular position. Here, we focus on an optical system for measuring precisely the angular position of flying objects. We designed this subunit of a beam control system exclusively from readily available commercial-off-the-shelf components. Two industrial cameras were used for angle measuring and for guiding the system to the position of the flying object. Both cameras are mounted on a modified astronomical mount with high-precision angle encoders. To achieve a high accuracy we temporally synchronize the acquisition of the angle from the pan tilt unit with the exposure of the camera. Therefore, a FPGA-based readout device for the rotary encoders was designed and implemented. Additionally, we determined and evaluated the influence of the distortion of the lenses to the measurement. We investigated various scenarios to determine the accuracy and the limitations of our system for angular position determination of flying targets. Performance tests were taken indoor and outdoor at our test sites. A target can be mounted on a fast moving linear stage. The position of this linear stage is continuously read out by a high resolution encoder so we know the target’s position with a dynamic accuracy in the range of a few μm. With this setup we evaluated the spatial resolution of our tracking system. We showed that the presented system can determine the angular position of fast flying objects with an uncertainty of only 2 μrad RMS. With this mobile tracking system for angular position determination of flying targets we designed an accurate cost-efficient opportunity for further developments.

Item URL in elib:https://elib.dlr.de/108267/
Document Type:Conference or Workshop Item (Poster)
Title:Accuracy analysis of a mobile tracking system for angular position determination of flying targets
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Walther, AndreasAndreas.Walther (at) dlr.deUNSPECIFIED
Buske, Ivoivo.buske (at) dlr.deUNSPECIFIED
Date:26 September 2016
Journal or Publication Title:Proceedings of SPIE - The International Society for Optical Engineering
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
DOI :10.1117/12.2241211
Page Range:99890T-99890T
Series Name:Technologies for Optical Countermeasures XIII
Keywords:Position determination, accuracy, tracking, visual servoing, UAS observation, pan tilt camera
Event Title:SPIE Remote Sensing and Security + Defence
Event Location:Edinburgh, Schottland, UK
Event Type:international Conference
Event Dates:26.-29. Sep. 2016
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Laser Research and Technology (old)
Location: Stuttgart
Institutes and Institutions:Institute of Technical Physics
Deposited By: Walther, Dipl.-Ing. Andreas
Deposited On:01 Dec 2016 13:04
Last Modified:05 Dec 2018 12:28

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