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这里我们针对三级固体火箭进行研究，主要考虑每一级发动机工作时推力 和比冲 与发动机试车存在摄动偏差（相差 ）时所产生火箭关机点时刻的状态偏差。火箭的飞行的动力学方程可建立在地面发射坐标系中，火箭的第一级、第二级和第三级按照固定的俯仰角程序飞行，第二、三级飞行时已在大气层外，此时可忽略气动力的影响。(Here we study for three solid rocket, the main consideration at every level when the engine thrust and state arising the moment the rocket off point perturbation deviation (difference) in the presence of specific impulse and engine test bias. Outside of the rocket flight dynamics equations can be established on the ground coordinate system launch, the rocket s first stage, the second and third stages according to a fixed elevation angle of flight procedures, and the second, when the third flight already in the atmosphere, this when can ignore the effects of gas dynamics.)

说明：  多项式相加简单程序，欢迎大家评价~~~~~(Add a simple polynomial procedure, welcome to evaluate ~~~~~)

matlab矩量法（Hallen公式）编的半波振子，但是电流总是不对(matlab method of moments (Hallen equation) series of half-wave dipole, but the current is always right)

the introduction for arduino beginner

C语言写的基2fft算法，测试过了结果，比matlab的结果精度还是稍差(fft algorithm in C language.Have testd the result.)

#include <iostream> #include <stdlib.h> #include <string.h> using namespace std const kl = 4, kzs = 2, m = 6, n = 4, Error = 5 char *K[kl] = {{"01"},{"bB"},{"23456789ACDEFacdef"},{"hH"}} int A[m][n] = {{1,2,2,5}, {1,3,2,4},{2,2,2,4},{2,2,2,4},{5,5,5,5},{5,5,5,5}},

对二维图片进行中心放大，能控制放大的倍数，采用最近邻法(enlarge pictures from the center of it，can control the index for enlargement)

这是一个用MATLAB做的指纹图像，希望对大家有用(This is a use MATLAB to do the fingerprint image, in the hope that useful)

VC++与Matlab混合编程之引擎操作详解(VC++ and Matlab programming of hybrid engine Operational Details)

实验四 数字解调与眼图 1. 验证2DPSK 相干解调原理。 2. 验证2FSK 过零检测解调原理。 (Four digital demodulation experiment with eye diagrams 1. verify the 2DPSK coherent demodulation. 2. Verify 2FSK zero-crossing detection and demodulation principle.)