Pattern_recognition1

说明：  实现了平方根容积卡尔曼滤波，十分好用，效果很好(This codes ultilize the srckf to filter something)

说明：  comsol仿真的学习教程，有助于初学者深度掌握comsol的 基本使用(Comsol simulation course is helpful for beginners to master the basic usage of COMSOL)

计算大气密度的程序 用于航空宇航研究的基础程序(With the code you can getting the atmosphere denisity along the height)

针对多径效应的影响，提出了一种基于矩阵束的MIMO 雷达低仰角快速估计方法。该方法同时考虑了发射多径信号和接收多径信号，采用单样本数信号矢量构造了一个前后向矩阵束，并利用两个酉矩阵对该矩阵束进行降维处理，最后采用广义特征值分解的总体最小二乘法来估计目标角度。算法不需要估计数据协方差矩阵，可在低 信噪比和单样本数情况下，有效地克服多径效应，实现同时多目标低仰角估计，相比最大似然算法，避免了谱峰搜索，计算量小。仿真结果验证了该算法的有效性。(To overcome the multipath effect, a fast algorithm for low elevation estimation for MIMO radar via matrix pencil is proposed. The signals both in transmit multipath and receive multipath are considered. Firstly, a forward-backward matrix pencil is formed based on the single-sampled vector. Secondly, the reduced-dimensional processing is applied to the matrix pencil via two unitary matrices. Finally, the generalized eigen-decomposition is employed to estimate the low elevation in multipath environments directly. Without the covariance matrix estimation, the proposed method can overcome multipath effect effectively in case of low SNR and estimate multi-target simultaneously. Compared with Maximum Likelihood (ML) method, it avoids spectrum peak searching and reduces the computational burden. Numerical results verify the effectiveness of this method)

4种计算积分的方法，并对精度进行比较，梯形法则，simpson法则(4 methods for calculating integral)

基于递推公式的MATLAB切比雪夫级数程序，能计算N阶多项式(Based on the recursive formula MATLAB Chebyshev series program, we can compute N order polynomials.)

关于超声波倒车雷达测距的，最大信噪比的独立分量分析算法，小波包分析提取振动信号中的特征频率。( About ultrasonic parking radar ranging, SNR largest independent component analysis algorithm, Wavelet packet analysis to extract vibration signal characteristic frequency.)

求解四元三次方程组，通过在VC++的编程环境，实现计算的高速运行(Solving four yuan cubic equations by VC++ programming environment, to achieve high-speed operation calculated)

基于随机共振的微弱信号检测仿真，且包含求解郎之万方程的四阶龙格库塔算法源程序。(Fourth-order Runge-Kutta algorithm source simulation based on stochastic resonance in weak signal detection, and includes solving the Langevin equation.)

一个由C语言写成的矩阵运算程序源代码，共初学者参考。(A C language source code matrix calculation, a total of reference for beginners.)