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Radio Tomographic Imaging with Wireless Networks

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2 Author(s)
Wilson, J. ; Univ. of Utah(UT), Salt Lake City, UT, USA ; Patwari, N.

Radio Tomographic Imaging (RTI) is an emerging technology for imaging the attenuation caused by physical objects in wireless networks. This paper presents a linear model for using received signal strength (RSS) measurements to obtain images of moving objects. Noise models are investigated based on real measurements of a deployed RTI system. Mean-squared error (MSE) bounds on image accuracy are derived, which are used to calculate the accuracy of an RTI system for a given node geometry. The ill-posedness of RTI is discussed, and Tikhonov regularization is used to derive an image estimator. Experimental results of an RTI experiment with 28 nodes deployed around a 441 square foot area are presented.

Published in:

Mobile Computing, IEEE Transactions on  (Volume:9 ,  Issue: 5 )