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自动控制理论中利用matlab编写二阶系统分别在欠阻尼，临界阻尼，过阻尼时的情况(Automatic control theory using matlab write second-order system in underdamped, critically damped, overdamped)

说明：  产生m序列 画出其自相关函数和功率谱密度曲线 利用m序列模二产生gold序列 计算gold序列的互相关函数(Generating M-series Draw the autocorrelation function and power spectral density curve Generating gold sequence by m-sequence module two Calculating the cross correlation function of gold sequence)

c code for LHMs and using the matlab to plot the field

说明：  用神经网络中的PCA算法对人脸图像进行压缩及恢复(PCA with a neural network algorithm for image compression on the face and back)

去斜率（strech）参考信号与回波信号混频后得到中频输出信号S(t)=Aexp(j*2*pi*f0*t+phase) 其中f0与回波延时的关系为： f0=k*delay_t K为线性调频斜率，delay_t为回波延时 将s(t)采样，FFT变换即可得到目标距离与频谱的关系。 Strech 信号测距 输入混频后的中频信号（图一），经采样及FFT变换得到频谱（图二） 再根据频谱与距离的关系式R=Tcf/2B显示出距离(图三) (Go slope (strech) obtained after the reference signal and the echo signal mixer IF output signal S (t) = Aexp (j* 2* pi* f0* t+phase) f0 and echo delay relationship: f0 = k* delay_t K chirp slope, delay_t the echo delay sampling s (t), the FFT transform to the target distance spectrum of relations. Strech signal ranging input mixer IF signal (Figure 1), sampling and FFT transform spectrum (Figure 2) according the the spectrum distance relationship R = Tcf/2B shows the distance (Figure 3))

Sliding mode control implementation

防积分饱和PID控制算法，MATLAB语言编写，仿真效果不错。(Anti-integral saturation PID control algorithm, MATLAB language, simulation results are good.)

m文件，有助于理解emd算法。有移植价值，初学emd必备(m file, helps to understand emd algorithm. Transplant value, emd essential beginner)

不错的动画效果的demo，真诚希望对大家有帮助，也希望大家来点人气，谢谢。(A good animation demo, sincerely hope to have the help to everybody, also hope to some popularity, thank you.)

给定技术指标，按照以上技术指标设计切比雪夫低通滤波器。(Given technical indicators, technical indicators in accordance with the above design Chebyshev low-pass filter.)