无线电层析成像中的恒定离心率椭圆模型

A Const-Eccentricity Elliptical Model in Radio Tomographic Imaging

修正无线电层析成像方法采用的变化离心率椭圆模型,引入恒定离心率椭圆模型.当采用链路2节点为椭圆焦点时,该链路RSSI的变化量是以恒定椭圆离心率所覆盖的每个像素点阴影衰落的加权求和.比较了不同模型和椭圆离心率的Tikhonov正则化重建图像;选择美国犹他大学和北京理工大学的试验数据,成像结果表明恒定离心率模型的效果优于变化离心率模型.还表明恒定椭圆离心率越大,定位精度越高,但存在伪迹.当采用恒定离心率椭圆模型时,合理的离心率应在0.996附近.

Variable-eccentricity elliptical model was corrected in radio tomographic imaging;constant-eccentricity elliptical model was introduced. When two link nodes are the focus of theellipse, the amount of the changed RSSI of link were weighted sum of shadow fading for eachpixel covered by constant-eccentricity ellipse. Tikhonov regularization reconstructed images ofdifferent models and elliptical eccentricity were compared. Test data of the University of Utahand 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 thelarger elliptical eccentricity is, the higher positioning accuracy becomes, but there is spuriousline. When using the constant-eccentricity elliptical model, reasonable eccentricity is nearin 0. 996.