cheking_frequency_match_ppg_and_accelaration

说明：  function [ret,x0,str,ts,xts]=s4(t,x,u,flag) s4 is the M-file description of the SIMULINK system named s4. The block-diagram can be displayed by typing: s4. SYS=s4(T,X,U,FLAG) returns depending on FLAG certain system values given time point, T, current state vector, X, and input vector, U. FLAG is used to indicate the type of output to be returned in SYS.

使用matlab对矩阵中的元素进行蛇形访问，并依次存放到新的向量里面(snake-like access to the elements of the matrix by MATLAB, and sequentially stored into the new vector)

对已经调制的信号进行相干解调，然后观察频域特性(The modulated signal for coherent demodulation, and then observe the frequency domain characteristics)

说明：  《matlab小波分析》的第二章源代码，与书是配套的，挺好的(&quot Matlab wavelet analysis,&quot the source code of the second chapter, with the book are complementary, and quite good)

基于三个模型的目标跟踪，中心角速度为0.偏移角速度固定。能够解决轨迹为非线性的目标的跟踪。自带轨迹。(Target tracking based on the three models, the central angular velocity is 0. Offsets the fixed angular velocity. Can solve the trajectory tracking of nonlinear target. Own trajectory.)

MATLAB课件，该课件是中文的，较容易学习，对于不熟悉英语的人有一定的好处。(MATLAB courseware, the courseware is Chinese, and more easy to learn, for people who are not familiar with English, have a certain advantage.)

solution of Electronics and Circuit Analysis Using MATLAB John O.Attia

改程序使用MATLAB编程实现了GPS的伪距单点定位(The modified program uses MATLAB programming to realize the pseudo range single point positioning of GPS)

基础的matlab程序，适合初学人员，多读多练，我觉得很好(Matlab-based program, suitable for novice staff, and more time practicing, I feel good)

说明：  基于麦克风阵列的声源定位，四元十字阵的matlab仿真(Microphone array based sound localization, four-element Array of matlab simulation)