sigvad11

绘制庞加莱截面图 在相空间中适当（要有利于观察系统的运动特征和变化，如截面不能与轨线相切，更不能包含轨线）选取一截面，在此截面上某一对共轭变量如x1和x.1取固定值，称此截面为Poincare截面，相空间的连续轨迹与Poincare截面的交点成为截点。(Poincare mapping sections in the phase space properly (should be beneficial to observe the system and changes in movement characteristics, such as the cross-section can not be tangent trajectory, but also can not contain rail line) to select a cross-section, in this section for a total of conjugate variables, such as x1 and X.1 take a fixed value, call this cross-section for the Poincare section, the phase space of the continuous trajectory of the point of intersection with the Poincare cross-section to become cut-off point.)

先得到一个定位初始估计值，再利用建立最大似然方程对这个定位初始估计值进行修正，从而得到更优定位结果值，方法更接近于最大似然方法。(Get the a position initial estimate, re-use to establish the maximum likelihood equations corrected for positioning the initial estimates, resulting in better positioning the resulting value is closer to the maximum likelihood method.)

非常快速的稀疏编码求解过程。可以用于各种类型的数据(fast solving the problem of sparse coding.You can apply sparse coding to any type of general data.)

说明：  神经网络的matlab实现 BP神经网络的一个简单实现方法(BP Neural Networks code)

双馈电机的仿真模型，其中双馈电机是自己根据双馈电机的电气四阶微分方程搭的，用的不是matlab/simulink自带的。(DFIG simulation model，realized by forth order ODEs.)

采用RS码技术的系统仿真，程序说明详尽，是学习通信技术的一个难得的好材料。(RS code using the system simulation, a detailed description of the procedures is to learn a valuable communication technologies good material.)

参数为：载波频率f0为20MHz，采样频率为4倍f0，脉宽为1us ，脉冲周期为20us 。其中：(Parameters: carrier frequency f0 is 20MHz, the sampling frequency is 4 times f0, a pulse width of 1us, the pulse period is 20us. Of which:)

在流场中和电磁场中 有必要画出箭头图 来进一步显示清楚(Plot 3D quiver)

GDP32可控源数据编辑软件，可对原始数据进行选择和编辑，频点选取等，为后续反演提供高质量数据体(GDP32 CSAMT data edit)

modelling and simulation of vector control of induction motors