s_function_7_8

直接序列扩频利用与信息无关的伪随机码，以调制方法将已调制信号的频谱宽度扩展得比原调制信号的带宽宽得多的过程。(Direct sequence spread spectrum has nothing to do with the information of pseudo-random code modulated signal spectrum width modulation method will be extended than the original modulation signal bandwidth is much wider process. )

使用FLORD算法求解任意两顶点间最短路的MATLAB程序示例代码(FLORD algorithm using arbitrary shortest path between two vertices of the MATLAB program sample code)

Matlab code for PIT techniquw

The code is based on passive positioning of the three-dimensional coordinate system Matlab algorithm simulation of three algorithms

各种music算法，远场线阵 近场线阵 近场圆阵 远场圆阵，正确估计DOA角和俯仰角 方位角(Various music algorithm, the far-field line array line array of near-field circular array of near-field far-field circular array correctly estimated the the DOA angle and pitch angle azimuth)

MS-AR：马尔科夫取值转移自回归模型，状态可取两种状态，也可以取多种状态。(MS-AR：the program of Markov Switching autoregressive model.)

Implements Maximum likelihood estimation of beta and other parameters for model of stock portfolio vs. index using kalman filter

说明：  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。(mapping Poincare section, in phase space appropriate (observation system should be beneficial to the movement and change, if not with the section line tangent track, rail lines not included) selected a cross section, in this section for a pair of conjugate variables such as x1 and X.1 from fixed value, stating that this section of the Poincare section, phase space for the track and Poincare sections of the intersection as intercept point.)

由匹配滤波器的讨论以及仿真分析可以得知，线性调频信号在经过传输时延以及加性噪声干扰的情况下，依然可以很有效的判断出信号的存在。(By matching the filter is discussed and the simulation analysis, linear FM signal after transmission delay and additive noise condition, still can be very effective to determine the presence of signal.)

Here is a simple Mathlab code for Software Phase Locked Loop mainly used for Digital Signal Processing.