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利用matlab求系统时间响应，用impulse函数和lsim函数对线性连续系统的时间响应进行仿真计算 (impulse function )

在PID控制中，微分信号的引入可改善系统的动态特性，但也易引起高频干扰。在误差扰动突变时尤其显出微分项的不足。若在控制算法中加入低通滤波器，则可使系统性能得到改善。(In PID control, the introduction of differential signal can improve the dynamic characteristics of the system, but it can also cause high-frequency interference. When error perturbations change abrupt, the deficiency of differential terms especially shows. If the low-pass filter is added to the control algorithm, the performance of the system can be improved.)

Great Way to start programming !

说明：  几个小波消噪的matlab源代码，希望可以帮到大家(some examples of wavelet)

分别生成圆，三角形，正方形，长方形的matlab(produce picture.)

hapke模型是土壤反射模型，辐射传导模型，1981年建立，现在已有很大发展(Hapke model is a soil reflectance model,RTM, established in 1981)

信源产生、信道编码、调制、信道传输、解调、信道译码、差错比较等通信过程的Simulink仿真方法。分析QPSK调制方式下Hamming编码方式在不同信噪比下的通信质量。 (Generated source, channel coding, modulation, channel transmission, demodulation, channel decoding, error comparison of the communication process of the Simulink simulation. QPSK modulation mode of Hamming encoding different signal to noise ratio in the quality of communication.)

本代码是基于MATLAB开发的，主要用于仿真基于PAM调制的UWB发射机(Pam调制的UWB 发射机)

rake接收机，简单易懂，来自美国著名教授，如有问题，联系02212090@bjtu.edu.cn()

本程序是一个基于matlab的雷达SAR成像自聚焦算法，对于学习雷达信号处理的人有帮助。(This procedure is a matlab-based imaging radar SAR Autofocus Algorithm for the study of radar signal processing has to help people.)