Microwave Imaging with Noise Waveforms Using FDTD Time Reversal Method

This article presents a microwave imaging method based on the time-reversed finite-difference time-domain method (FDTD-TR) that enhances immunity to undesired interference and jamming signals. The method uses random noise as the source waveform that illuminates the imaging area. Signals scattered by objects in the imaging area are collected on a planar grid, followed by processing through a correlation operation, and then used in the FDTD-TR algorithm to construct images on any desired plane in the computational domain. The method capability in suppressing interference noise is demonstrated through successful reconstruction of images for a test case consisting of a dielectric object behind a wall. The method is compared to conventional FDTD-TR methods that fail the same image reconstruction test.