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Wireless orientation sensing using magnetoquasistatic fields and complex image theory

2012
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2012 IEEE Radio and Wireless Symposium
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For a magnetic dipole source, the magnetic fields of the source and the complex image are H s (x, y, z) = H

doi:10.1109/rws.2012.6175362
dblp:conf/rws/ArumugamGSR12
fatcat:ydxfksjpz5auxeeaujw6fisud4
*d*(x, y, z−h) and H i (x, y, z) = H*d*(x, y, −z −h−δ(1−j)), where H*d*(x, y, z) is the magnetic ... This resulted in an estimated distance accuracy of better than 24 cm for distances up to 34.2 m between the emitter and receiver (one-dimensional, 1-*D*) along a direction perpendicular to the surface normal ...##
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Experimental Demonstration of Complex Image Theory and Application to Position Measurement

2011
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IEEE Antennas and Wireless Propagation Letters
*

H

doi:10.1109/lawp.2011.2136370
fatcat:rbykiqwgnnbyxkqc4dcp2mcgre
*d*is given by H s (x, y, z) = H*d*(x, y, z − h) and H i (x, y, z) = H*d*(x, y, −z − h − α), h δ(1-j) σ = 0 σ > 0 R i Region I Region II Region III σ = 0 μ = μ = μ = μ I II III o h z x y Emitter (Source ... The fields of the source and complex image are respectively, where H*d*(x, y, z) is the field from a magnetic dipole in free space located at the origin. ...##
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Long Range Passive UHF RFID System Using HVAC Ducts

2010
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Proceedings of the IEEE
*

Table 1 gives cutoff dimensions for rectangular waveguide of wide dimension a (fundamental mode is TE 10 ) and circular waveguide of diameter

doi:10.1109/jproc.2010.2047821
fatcat:uszrjohzpzempp5arknra33dhu
*D*(fundamental mode is TE 11 ). ... Assuming single-mode propagation, the maximum range of the RFID tag in a duct waveguide can easily be found from (1) and (3) as*d*max ¼ 1 ln P t t C t C P chip : (4) For the multimode case, such a ...##
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Environmental and performance analysis of SAW-based RFID systems

2007
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International Journal of Radio Frequency Identification Technology and Applications
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The relationship between the electrical and mechanical properties is governed by the following equations (Dunn and Whatmore, 2001) : E i i j j k i k S s T

doi:10.1504/ijrfita.2007.013143
fatcat:iwpgkhnawfbkleqxjahcjgcdrm
*d*E = + (1) T l l m m l n n*D**d*T E ε = + (2) ... ceramic*d*33 = 117 Lead lanthanum zirconate titanate (PLZT) Pb 0.925 La 0.5 Zr 0.56 Ti 0.44 O 3 Polycrystalline ceramic*d*33 = 545 Polyvinlidene fluoride (CH 2 CF 2 ) n Oriented film*d*...##
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Characterisation of RF propagation in metal pipes for passive RFID systems

2007
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International Journal of Radio Frequency Identification Technology and Applications
*

*d*1

*d*0

*d*

*d*

*d*f f g r hr f r g r θ ⎡ ⎤ + + + = ⎢ ⎥ ⎣ ⎦ (4) Recognising that the terms on the left are only a function of r, that the terms on the right are only a function of θ and that, 2 2

*d*

*d*

*d*

*d*

*d*...

*d*

*d*

*d*f f f r r r r r r ⎛ ⎞ + = ⎜ ⎟ ⎝ ⎠ (5) We can rewrite the wave equation as, 2 2 2 2 2

*d*

*d*1

*d*

*d*

*d*

*d*r g r hr n f r r g θ ⎛ ⎞ + =− = ⎜ ⎟ ⎝ ⎠ (6) Where n is an integer constant requirement from the ...

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Experimental study on the effects of groups of people on magnetoquasistatic positioning accuracy

2012
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Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation
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Position and orientation measurements have been demonstrated, recently, using low-frequency magnetoquasistatic fields and complex image theory for distances up to 50 m [1]. The key motivation for using magnetoquasistatic fields is to enable accurate estimation of an object's position and orientation when near weakly conducting dielectric obstacles, e.g., groups of people. An example application is tracking an American football during game-play [1]. In this paper, we present measurements using

doi:10.1109/aps.2012.6349385
fatcat:sd55sghohrb2te2yxku3tvv2yi
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... e magnetoquasistatic technique to show that the presence of a large group of 25 people introduces a peak distance error of less than 4.5 cm for an emitter-receiver distance of 10 m.##
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2D localisation using SAW-based RFID systems: a single antenna approach

2007
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International Journal of Radio Frequency Identification Technology and Applications
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E i i j j k i k S s T

doi:10.1504/ijrfita.2007.017750
fatcat:ptykrqkvcfg6vh2lttu3rsm2sq
*d*E = + (1) T l l m m l n n*D**d*T E ε = + (2) Here S,*D*, E and T are the strain, dielectric displacement, electric field and stress, respectively, and , E ij s ki*d*and T ln ε are ... Figure 7 7 RSS versus reader to tag distance Source:*Arumugam*et al. (2007). ...##
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NeBula: Quest for Robotic Autonomy in Challenging Environments; TEAM CoSTAR at the DARPA Subterranean Challenge
[article]

2021
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arXiv
*
pre-print

The ground truth is provided by DARPA for (a)-(

arXiv:2103.11470v4
fatcat:rq2wgczzl5clphzgujjdbd3ywm
*d*) and by survey scans for (e). ... (c) and (*d*) Urban dataset from Satsop Power Plant on a Husky robot platform. (e) Cave dataset from Valentine Cave on a Spot robot. ... Nicolas Marchal, Oriana Claudia Peltzer, Joshua Ott, Nicholas Palomo, Adam Jaroh, Heiko Helble, Aaron Ames, Issa Nesnas, Fernando Mier-hicks, Shreyansh Daftry, Nicholas Peng, Mitra Azar, Corey Mack,*Darmindra*...