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Wireless orientation sensing using magnetoquasistatic fields and complex image theory

Darmindra D. Arumugam, Joshua D. Griffin, Daniel D. Stancil, David S. Ricketts
2012 2012 IEEE Radio and Wireless Symposium  
For a magnetic dipole source, the magnetic fields of the source and the complex image are H s (x, y, z) = H 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  ... 
doi:10.1109/rws.2012.6175362 dblp:conf/rws/ArumugamGSR12 fatcat:ydxfksjpz5auxeeaujw6fisud4

Experimental Demonstration of Complex Image Theory and Application to Position Measurement

Darmindra D. Arumugam, Joshua D. Griffin, Daniel D. Stancil
2011 IEEE Antennas and Wireless Propagation Letters  
H 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.  ... 
doi:10.1109/lawp.2011.2136370 fatcat:rbykiqwgnnbyxkqc4dcp2mcgre

Long Range Passive UHF RFID System Using HVAC Ducts

Pavel V. Nikitin, Darmindra D. Arumugam, Matthew J. Chabalko, Benjamin E. Henty, Daniel D. Stancil
2010 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 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  ... 
doi:10.1109/jproc.2010.2047821 fatcat:uszrjohzpzempp5arknra33dhu

Environmental and performance analysis of SAW-based RFID systems

Darmindra D. Arumugam, Daniel W. Engels, Amar Modi
2007 International Journal of Radio Frequency Identification Technology and Applications  
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 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  ... 
doi:10.1504/ijrfita.2007.013143 fatcat:iwpgkhnawfbkleqxjahcjgcdrm

Characterisation of RF propagation in metal pipes for passive RFID systems

Darmindra D. Arumugam, Daniel W. Engels
2007 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  ... 
doi:10.1504/ijrfita.2007.015853 fatcat:fkdw47xwijbfjd2q45v5z7kp2a

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

Darmindra D. Arumugam, Joshua D. Griffin, Daniel D. Stancil, David S. Ricketts
2012 Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation  
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
more » ... 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.
doi:10.1109/aps.2012.6349385 fatcat:sd55sghohrb2te2yxku3tvv2yi

2D localisation using SAW-based RFID systems: a single antenna approach

Darmindra D. Arumugam, Vijayakrishnan Ambravaneswaran, Amar Modi, Daniel W. Engels
2007 International Journal of Radio Frequency Identification Technology and Applications  
E i i j j k i k S s T 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).  ... 
doi:10.1504/ijrfita.2007.017750 fatcat:ptykrqkvcfg6vh2lttu3rsm2sq

NeBula: Quest for Robotic Autonomy in Challenging Environments; TEAM CoSTAR at the DARPA Subterranean Challenge [article]

Ali Agha, Kyohei Otsu, Benjamin Morrell, David D. Fan, Rohan Thakker, Angel Santamaria-Navarro, Sung-Kyun Kim, Amanda Bouman, Xianmei Lei, Jeffrey Edlund, Muhammad Fadhil Ginting, Kamak Ebadi (+60 others)
2021 arXiv   pre-print
The ground truth is provided by DARPA for (a)-(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  ... 
arXiv:2103.11470v4 fatcat:rq2wgczzl5clphzgujjdbd3ywm