Xiaoli Xi

Learn More
An auxiliary differential equation finite-difference time domain (ADE-FDTD) methodology was used here to study the propagation of electromagnetic wave through a plasma sheath The reflection and transmission coefficients calculated by ADE-FDTD were compared with the analytic ones. The result shows an excellent agreement. Then, ADE-FDTD was used to resolve(More)
Based on the impulse radar and the spread-spectrum (SS) radar, the through-wall imaging with three stationary targets or a moving target in a room are obtained, respectively, and compared in this paper. We then analyze the influences of different analog-to-digital converters (ADCs) and noise levels on imaging quality. Results show that the SS radar has a(More)
An stretched coordinate (SC) based perfectly matched layer (PML) is presented for Weighted-Laguerre-Polynomial finite-difference time-domain (WLP-FDTD) method. The SC-PML is used for truncating plasma media. The absorbing boundary is implemented using the auxiliary differential equation. Numerical example is included to validate the proposed algorithm.
There is a contradiction in classical adaptive filtering algorithm that fast convergence speed comparing with low steady state error. In order to improve this contradiction, this paper presents a new non-parametric Variable Step-Size NLMS algorithm. The new algorithm uses gradient vector's features to achieve the step iteration and a certain approximation(More)
In this paper, a geomagnetic matching navigation method that utilizes the geomagnetic vector is developed, which can greatly improve the matching probability and positioning precision, even when the geomagnetic entropy information in the matching region is small or the geomagnetic contour line's variety is obscure. The vector iterative closest contour point(More)
We present an unconditionally stable weighted Laguerre polynomials (WLPs)-based finite-difference time-domain (FDTD) algorithm for modeling wave propagation in isotropic cold plasma. The plasma effects contributed by electrons and collisions are modeled by current density vectors collocated with the electric field components. The factorization-splitting(More)
The Parabolic Equation (PE) method is employed to solve the Loran-C additional secondary factors (ASFs) over irregular terrain. The method is based on split-step Fourier transform (SSFT) algorithm, and has been proven to be numerically efficient. The ASF results are compared to those of finite-difference time-domain (FDTD) method and integral equation (IE)(More)