3freedomnon-linemodel

直接序列扩频DSSS， 跳频扩频FHSS， 码分多址CDMA编译码， 的实现(the realization of Direct Sequence Spread Spectrum DSSS, frequency hopping spread spectrum FHSS, Code Division Multiple Access CDMA codec, )

无线充放电中的谐振网络仿真设计，有助于了解谐振网络。(The simulation design of resonant network in wireless charge and discharge is helpful to understand resonant network.)

从经典功率谱估计周期图法原理入手，从理论上分析了其存在的局限性，借助Welch算法对其进行修正。依靠Matlab强大的数值分析和信号处理能力，进行实验仿真，比较不同的窗函数，不同的数据长度对Welch法谱估计质量的影响，并分析了造成这些影响的原因。(The paper mainly introduces the principles of Periodogram method of classical PSD estimation,analyzes the deficiency of Periodogram method in theory,and makes use of Welch to amend Perodogram method. By the use of simulation in Matlab, the impacts of different window function and different lenghth of data on estimation quality of Welch are discussed and the reasons of the impacts are analyzed.)

用差分法解一类Bessel方程在不同边界条件下的离散解(difference method for solving a class of Bessel equation in different boundary conditions of the Discrete Solutions)

说明：  多种智能天线经典波束形成算法，具有良好的方向图。(samrt antenna beamforming ,good performance)

Dual band SRR metamaterial

中频70M，30M带宽LFM信号，采样率为102.4M，数字下变频后，还进行了三倍抽取，最后还得到I，Q两路信号 (IF 70M, 30M bandwidth LFM signal, the sampling rate of 102.4M, digital down conversion, the samples were carried out three times, the last also I, Q two-way signal)

内含costas环代码与simulink 结合起来理解比较好(Containing the costas ring code and simulink combine better understanding)

matlab的轨道力学子程序，适用于搞航天航空的专业人士学习和使用。(matlab subroutine of orbital mechanics, for aerospace professionals to engage in learning and use.)

摄影测量与遥感的课程中的框标识别的程序，简单易懂(identified logo program in Photogrammetry and Remote Sensing ，easy to understand)