matlab.ppt

Numerical codes for solving mathematical equations

GprMax的理论基础是时域有限差分(FDTD)方法。时域有限差分方法直接将Maxwell方程作差分离散，利用二阶精度的中心差分近似把Maxwell方程中的微分算符直接转换为差分形式，在空间和时间上对电场和磁场交替间隔取样，使计算过程完全模拟电磁波逐步传播以及与目标物体相互作用的过程。(GprMax is based on the theory of the finite difference time domain (FDTD) method. The finite difference time domain method directly will Maxwell equation of discrete difference, using second order precision of the central difference in the equations are Maxwell approximate differential operator directly convert difference forms, in the space and time of electric field and magnetic field on alternate sampling interval, making the calculation process simulation electromagnetic wave propagation and completely step by step and target object interaction process. )

用预测算法控制三相逆变器，该方法简单易懂，适合入门学习(With a prediction algorithm control three-phase inverter, the method is simple and easy to understand, suitable for beginners to learn)

this matlab code implements a new watermarking method using wavelet transform

说明：  Gabor变换用于提取图像不同角度和尺度的信息，角度和尺度可以变换。(Gabor transform to extract the image information of different angles and scales, angle and scale may be changed.)

采用matlab编程的DTMF检测程序仿真，经过测试，绝对可用，可检测多个DTMF信号！(using Matlab programming DTMF detection process simulation, tested and absolutely can be used, can detect DTMF signals over!)

雷达/红外跟踪扩展卡尔曼滤波，望交流。(Radar infrared tracking extended Kalman filter)

说明：  对信号进行频域特征提取，先通过傅里叶变换得到信号频谱，再计算频谱特征，包括重心频率，均方频率和频率方差(Firstly, the frequency spectrum of the signal is obtained by Fourier transform, and then the spectrum characteristics, including center of gravity frequency, mean square frequency and frequency variance, are calculated.)

DC-Motor Simulation and System Identification

ENERGY DETECTION THRESHOLD