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了解单频激光干涉仪的非线性误差，使用matlab软件工具对提出的非线性误差修正方法进行验证，对干涉信号中的直流分量偏差对测量的影响进行分析。(Learn nonlinearity error single frequency laser interferometer using matlab software tools for the proposed non-linear error correction method for verification of the DC component of the interference signal on the measurement of the deviation analysis.)

协方差驱动随机子空间法的matlab算法，我下的。(Covariance-driven stochastic subspace method)

在过程控制中，按偏差的比例（P）、积分（I）和微分（D）进行控制的PID控制器（亦称PID调节器）是应用最为广泛的一种自动控制器。(In process control, according to the ratio of deviation (P), integral (I) and differential (D) to control the PID controller (also known as PID regulators) is the most widely used an automatic controller.)

i want to download the codes

svr源程序，输入到matlab中进行svr回归模型建立与分析(SVR source program, input into matlab SVR regression model establishment and analysis)

连接一起的下半部分是传统一次调频系数的仿真，参数如算例所示，上半部分是其改进一次调频系数后的仿真，最后由示波器观测波形的不同。(The lower half of the connection is the simulation of the traditional primary frequency modulation coefficient. The parameters are shown in the example. The first half is the simulation after the improvement of the primary frequency modulation coefficient, and finally the waveform is observed by the oscilloscope.)

main program of avg crystal

功率谱分析，经过修改的，yuler_walke、welch、relax、相关图、周期图等(Power spectrum analysis, modified, yuler_walke, welch, relax, related maps, cycle map)

说明：  两自由度系统振动模型，初级学习模型，Simulink(Two-degree-of-freedom system vibration model, primary learning model, Simulink)

产生有色噪声污染的谐波，并设计带通巴特沃斯滤波器和切比雪夫I型滤波器(Colored noise pollution generated harmonics, and to design band-pass Butterworth filter and Chebyshev-I filter)