Madgwick

一些有关fft 的东西，与大家共同欣赏。谢谢，大家的指正。(something about fft)

It can be applyed forthe Spectral Element Method conbined finite element and spectral method to solve the 2D wave equation.as a pecial case is SH. dynamic fault with slip weakening is considered either.

生成雷达探测中五种Swerling模型的pdf曲线，经调试过，可以用(Pdf curves generated radar five Swerling model, after debugging, you can use)

说明：  若非奇异矩阵A能够分解为一个正交矩阵Q与非奇异上三角矩阵R的乘积，即： A=QR。则称其为A的QR分解。 实现QR分解的方法有很多种，包括Givens变换法，Householder变换法，Schemit正交化法。具体原理可以参考《矩阵论》（程云鹏，西工大出版）教材，这里仅给出三种实现QR分解的程序。(If nonsingular matrix A can be decomposed into a product of orthogonal matrix Q and nonsingular upper triangular matrix R, that is: A=QR. It is called QR decomposition of A. There are many methods to realize QR decomposition, including givens transformation, householder transformation, and scheme orthogonalization. The specific principle can refer to the teaching materials of matrix theory (Cheng Yunpeng, published by Xigong University). Here, only three kinds of QR decomposition procedures are given.)

求希尔伯特变换后的瞬时频率,经过信号的解析，反正切变换，求导得出(instant frequency)

Nhan dang chuyen dong.

几组自己编造的典型声速剖面下的传播损失对比图。自动化是我们的集中追求。(several manmade sound speed profile and its horizontal transmission loss.)

说明：  mushroom classify and train

阵列天线时TD_SCDMA系统信道估计性能的新型改进(Array antenna system, the channel estimation performance TD_SCDMA New Enhanced)

UKF 代码 自己编写的！！！！！！！！！！！！！！！！！！(UKF code is written in their own)