Determination of the Behavior of Moving Human Body from the Scattered Field Data by Using FDTD Method

摘要

This paper is a study on obtaining the necessary data for a possible design of an electronic system, which will be used to give an output related to the behavior and goal of moving human body. We intend to obtain the characteristics of scattered field from several classified movement; i.e., normal, disquieted, and/or suspicious, in a closed three-dimensional region; i.e., a warehouse, which is under control. The problem is modeled with an inverse scattering approach. The time domain solutions related with electromagnetic waves scattered from human body moving with different behaviors are obtained by FDTD method. The results are connected to a graphical inversion technique. A suitable inverse scattering problem is set up and then solved as concerning the moving biological target to materialize the above-mentioned device. Then, the relevant parameters and a resolution concept will be obtained to determine the realization of our aim. Here, the volume of the observed field is considered as surrounded by a perfectly electrical conductor. There are some perfectly electrical conducting objects such as cabinets inside. Human body is chosen for the moving biological target. Half wavelength dipole antenna is used as the transmitter. Time domain characteristics of electric field are calculated for each of movement behaviours that are classified as normal, disquieted and suspicious, at different observation points by using FDTD technique. Finally, the inverse scattering problem is constructed by a semi-analytical-graphical approach given here.