LJH

说明：  画出系统的阶跃响应曲线，计算系统的上升时间，调节时间，超调量，稳态误差。。。(drawing the system s step response and comput its adjusting time \stastical error)

介绍了一种新的全光纤激光器，脉冲的，峰值功率不是很大(We report a narrow-linewidth (∆ λ = 0.4 nm) optical pulsed MOPA (master oscillator – power amplifier) source emitting 0.41 mJ pulses (1.5 kW peak power) in the eye-safe range (λ=1548 nm). Pulse duration and repetition rate were 90 ns and 5 kHz respectively. )

基于EMD的直流电机换向电流提取程序。内含用LEM公司的霍尔传感器实测的微型直流电动机启动时的电流信号（真实的数据和大家分享），分别用小波滤波和EMD消噪，并用EMD提取直流分量、高频换向电流，对研究电机间接测速、启动特性测试很有帮助，对电机故障诊断也有帮助。(EMD-based DC motor commutation current extraction procedures. LEM s included with Hall sensors measured miniature DC motor start-up current signals (real data and to share), respectively, with wavelet filtering and EMD de-noising and extracted DC component with EMD, a high-frequency current commutation of indirect research motor speed, starting characteristics testing is helpful, for motor fault diagnosis can also help.)

Simulink Model for DC motor Control

四元数的隆戈库塔法，利用隆戈库塔队四元数进行更新，可以从中提取出载体姿态信息(Quaternion Longo Kutta method, using Longo Coulthard team quaternion update, can be extracted from vector-profile information)

说明：  这是2自由度并联机构的位置反解和一阶影响系数求输入速度的代码(This is a 2-DOF parallel mechanism of the inverse position and the first coefficient of seeking input speed of the code)

dq transformation for filters..it s very good example..

应用简正波理论求解下列声场：如下图所示波导模型，上层为均匀水层，其厚度为100m，声速为1500m/s；下层为硬质均匀海底，海面和海底均平整。点声源位于30m深处，辐射声波频率为25Hz，编程计算10m和90m深度上的传播损失，分析其差别。(The normal wave theory is applied to solve the following sound fields: the waveguide model shown in the following figure shows that the upper layer is a uniform water layer with a thickness of 100m and a sound velocity of 1500m/s; the lower layer is a hard uniform seabed with smooth surface and seabed. The point source is located at the depth of 30m and the frequency of radiated sound wave is 25Hz. The propagation loss at the depth of 10m and 90m is calculated by programming, and the difference is analyzed.)

GPS TEC计算MATLAB代码，来自东京大学TOMOJI教授(GPS TEC calculation of MATLAB code, from the University of Tokyo professor TOMOJI)

多普勒测速：自相关频率估计，估计误差等仿真(about Doppler velocimetry: from the relevant frequency estimation, estimation error and other simulation )