xiefangcha

全国大学生数学建模2004年B题的程序。用Matlab编程。运行良好(Mathematical Contest in Modeling 2004 B title process. Using Matlab programming. Running well)

先进PID控制程序原代码和仿真（很详细）(Advanced PID control program the original code and simulation (very detailed) 双语对照查看 )

频率细化技术在超低频/极低频电磁信号检测中的应用(Frequency refinement technique in ELF/low frequency electromagnetic signal detection)

這是一個利用butter filter 的bandstop 來濾除原始訊號中有雜訊的方法，先轉為spectrogram觀察雜訊所分步頻帶與能量，再依照要濾除的部分作bandstopa(This is a use of bandstop butter filter to filter out the noise of the original signal has a method, the first step into a spectrogram observation noise and energy of the band, then follow to filter out parts for bandstopa)

CIRCULAR CONVOLUTION,CORRELATION,DIGITAL IIR FILTERS_BUTTERWORTH,DIGITAL IIR FILTERS_CHEBYSHEV, FIR FILTER DESIGN,FIR_TMS

说明：  本文研究了有限反馈下基于博弈论的联合功率分配与反馈速率控制优化问题。通过建立新的博弈模型，证明了其纳什均衡的存在性。同时，根据功率与反馈速率的关系，提出了一种迭代算法，可快速收敛到博弈不动点。仿真结果表明，联合优化算法的性能优于单单考虑反馈速率的算法。(In this paper, under the limited feedback joint power allocation based on game theory and feedback rate control optimization problems. Through the establishment of a new game model proved its existence of Nash equilibrium. Meanwhile, according to the relationship between power and the feedback rate proposed an iterative algorithm can quickly converge to a fixed point game. Simulation results show that the performance of joint optimization algorithm is superior to just consider the feedback rate of the algorithm.)

脉冲编码调制是数字通信的编码方式之一。主要过程是将话音、图像等模拟信号每隔一定时间进行取样，使其离散化，同时将抽样值按分层单位四舍五入取整量化，同时将抽样值按一组二进制码来表示抽样脉冲的幅值。(PCM pulse code modulation is one of the encoding methods of digital communication. The main process is to voice, image and other analog signal at a certain time for sampling, the discretization, while the sampling values by the hierarchical units four to five homes in rounding quantization, while the sampling value indicates the sample pulse amplitude according to a set of binary code.)

说明：  GPS中频信号模拟源设计实现，通过分析当前GPS信号模拟源的数学模型方案，改进后进行实现。(The GPS intermediate frequency signal imitation source design realizes, through analysis current GPS signal imitation source mathematical model plan, after the improvement, carries on realizes. )

Main program using MATLAB for feature extraction

matlab 计算带驱动力偏微分方程poincare map，方程为dy(1)=y(2) dy(2)=-k*y(2)-y(1)^3+B*cos(t) (Matlab calculation of belt driving force of partial differential equation and Poincare map equation, Dy (1) =y (2) Dy (2) =-k*y (2)-y (1) ^3+B*cos (t) )