warning-modeling

人月神话，又是一本软件工程领域的经典书籍，必读。。。。(MythManMonth.rarMythManMonth.rar)

线性调频信号短时傅里叶变换 线性调频信号短时傅里叶变换 (chirp signal stft chirp signal stft chirp signal stft)

1. 给定模拟信号：，式中，，。对进行采样，可得采样序列 选择采样频率=1 kHz，观测时间ms，观测所得序列及其幅频特性 改变采样频率=300Hz，观测此时的变化 令采样频率=200Hz，观测此时的变化 要求分析说明原理，绘出相应的序列及其它们对应的幅频特性曲线，指出的变化，说明为什么？(failed to translatefailed to translatefailed to translatefailed to translate)

用MATLAB编写的混沌序列图像加密程序，密钥可以从0到1之间的任何一个数(MATLAB prepared by the chaotic sequence image encryption program, the key can be any number 0 to 1)

两个信号源，八个阵元，采用DML实现DOA方位角估计，给出空间谱图。(Using DML algorithm to estimate the azimuth of DOA)

根据已知数据拟合多次函数，自行修改数据和次数自动生成拟合函数(According to known data fitting multiple functions modify the number of automatically generated data and fitting function)

AM、DSB 调制及解调 用matlab产生一个频率为1Hz，功率为1的余弦信源m(t)，设载波频率ωc =10 Hz， m0 = 2 ,试画出： 􀁺 AM 及DSB 调制信号的时域波形； 􀁺 采用相干解调后的 AM 及DSB 信号波形； 􀁺 AM 及DSB 已调信号的功率谱； 􀁺 调整载波频率及 m0，观察分的AM 的过调与DSB 反相点现象。 􀁺 在接收端带通后加上窄带高斯噪声，单边功率谱密度0 n = 0.1，重新解调。 (AM, DSB modulation and demodulation Matlab produce a frequency for 1 Hz, power of 1 cosine source m (t), set the carrier frequency ω c = 10 Hz, M0 = 2, try drawing out: )

这一段代码是基于matlab的仿真编程，主要是针对16QAM的调制，代码及其仿真结果无不从各个方面详细分析了技术原理。(This piece of code is based on the Matlab simulation programming for 16QAM modulation, code and its simulation results are all from the various aspects of a detailed analysis of the technical principles.)

watermark using correlation and pn sequence

Control of induction generator