28 Sep 2016
Investigations on antenna array calibration algorithms for direction-of-arrival estimation
Michael Eberhardt
CORRESPONDING AUTHOR
Institute of Microwave Engineering, Technical University of Munich, Munich, Germany
Philipp Eschlwech
Institute of Microwave Engineering, Technical University of Munich, Munich, Germany
Erwin Biebl
Institute of Microwave Engineering, Technical University of Munich, Munich, Germany
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In the present publication a GPS- based localization system for saving fawns during pasture mowing was introduced. Fawns were first found by a UAV before mowing began. They were then tagged with active RFID transponders, and an appropriate reader was installed on a mowing machine. Conventional direction-of-arrival approaches require a large antenna array, while our transponders were equipped with a small GPS module, allowing a transponder to determine its own position on request from the reader.
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This paper presents a localization concept for fawn saving. Fawns can be saved during pasture mowing by marking them with an active UHF RFID transponder. The system consists of a mowing-machine mounted direction-of-arrival (DOA) system and a handheld DOA device. Only by estimating the DOA one can reliable localize the marked fawns. The whole RFID and DOA system is presented and communication concept is shown.
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In this work, silver and gold nanoparticle inks were printed by a consumer inkjet printer on eco-friendly substrates like paper and PET in order to make the RFID tag manufacturing process less harmful to the ecosystem. A dipole antenna was designed and based on this design, simulations of the greener tags are presented and compared as a proof of concept for the different materials. First measurements are conducted and simulations with the optimized antenna designs are shown.
A. Ascher, M. Eberhardt, M. Lehner, and E. Biebl
Adv. Radio Sci., 14, 71–76, https://doi.org/10.5194/ars-14-71-2016, https://doi.org/10.5194/ars-14-71-2016, 2016
Short summary
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In the present publication a GPS- based localization system for saving fawns during pasture mowing was introduced. Fawns were first found by a UAV before mowing began. They were then tagged with active RFID transponders, and an appropriate reader was installed on a mowing machine. Conventional direction-of-arrival approaches require a large antenna array, while our transponders were equipped with a small GPS module, allowing a transponder to determine its own position on request from the reader.
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M. Eberhardt, M. Lehner, A. Ascher, M. Allwang, and E. M. Biebl
Adv. Radio Sci., 13, 87–94, https://doi.org/10.5194/ars-13-87-2015, https://doi.org/10.5194/ars-13-87-2015, 2015
Short summary
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This paper presents a localization concept for fawn saving. Fawns can be saved during pasture mowing by marking them with an active UHF RFID transponder. The system consists of a mowing-machine mounted direction-of-arrival (DOA) system and a handheld DOA device. Only by estimating the DOA one can reliable localize the marked fawns. The whole RFID and DOA system is presented and communication concept is shown.
A. Ascher, M. Lehner, M. Eberhardt, and E. Biebl
Adv. Radio Sci., 13, 81–86, https://doi.org/10.5194/ars-13-81-2015, https://doi.org/10.5194/ars-13-81-2015, 2015
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Short summary
This paper investigates the practicability of some well known antenna array calibration algorithms and gives a deeper insight into existing obstacles. Analysis on the validity of the common used calibration model is presented. A new effect in modeling errors is revealed and simulation results substantiate this theory. The research goal was to simplify calibration procedures for antenna arrays which are used for direction-of-arrival estimation.
This paper investigates the practicability of some well known antenna array calibration...
