Simulation of Vortex Electromagnetic Wave Imaging for Underwater Targets

We implemented a simulation of vortex electromagnetic (EM) waves imaging for underwater targets. Depending on the approximate duality relationships between the topological charge of orbital angular momentum (OAM) and the target azimuth, as well as the spatial wave number and the target range, the simulated 2-D images of underwater targets are obtained by means of MATLAB software. In the vortex imaging, we have comprehensively compared the performances (such as resolution, recognizability and so on) of Fast Fourier Transform (FFT), Covariance, Burg and Yule-Walker estimation algorithms. It is concluded that Yule-Walker algorithm with higher resolution and better recognizability is considered more suitable for imaging.