A Const-Eccentricity Elliptical Model in Radio Tomographic Imaging

Variable-eccentricity elliptical model was corrected in radio tomographic imaging; constant-eccentricity elliptical model was introduced. When two link nodes are the focus of the ellipse, the amount of the changed RSSI of link were weighted sum of shadow fading for each pixel covered by constant-eccentricity ellipse. Tikhonov regularization reconstructed images of different models and elliptical eccentricity were compared. Test data of the University of Utah and the Beijing Institute of Technology were selected; imaging results show that the constant-eccentricity model is better than variable-eccentricity model. The imaging results show that the larger elliptical eccentricity is, the higher positioning accuracy becomes, but there is spurious line. When using the constant-eccentricity elliptical model, reasonable eccentricity is near in 0.996.