fangshe

本文提出了一种适用于低轨卫异扩频通信系统的多普勒频移快捕方法.该方法基于数字匹配滤波器及自动频率控制环路_利用数字匹配滤波器的囚码快捕特性及其输出主相关峰值对频偏的敏感性，缩短多普勒频移的 捕获时间.论文首先推导了多普勒频移的平均捕获时间表达式，然后根据数值分析结果得到了准最佳捕获判决策略，最后通过比较验证了该快捕方法相对于传统串行捕获方法在性能上的提高. (This paper presents a low-orbit health for different spread spectrum communication system fast catching the Doppler shift method, which based on digital matched filter and automatic frequency control loop _ prisoners using digital matched filter code features rapid acquisition and the output of the main correlation peak frequency deviation of the sensitivity of the Doppler frequency shift to shorten acquisition time. paper first derive the mean Doppler shift acquisition time expression, then the numerical results obtained quasi-optimal capture decision strategies, and finally verified by comparing with the rapid acquisition method to capture the traditional method of serial improvement in performance.)

基于小波变换的数字水印算法matlab代码，matlab小波分析程序，isodata 迭代自组织的数据分析。( Based on wavelet transform digital watermarking algorithm matlab code, matlab wavelet analysis program, Isodata iterative self-organizing data analysis.)

matlab在通信中的仿真应用 移相键控(matlab simulation applications in communications phase shift keying)

optimization codes for matlab

HHT的经典文献 每个研究HHT的人必看的入门文献，极其重要。(The classical literature each study HHT will see HHT introduction to literature, is extremely important. )

这是一个使用hough变换来实现一副图像中直线检测的代码,比较高效而且检测效果很不错(use hough transform to achieve an image line detection code, more efficient and effective detection is pretty good)

这是秦永元所著的《惯性导航》一书，根据其中的内容用matlab中的simulink编写的关于惯导基本原理的小程序，适合初学者学习，修改加以应用(the Inertial Navigation of simulink)

本算法是一种变步长的LMS算法，可以适用于智能算法等相关技术中(this algorithm is about a variable step-size LMS adaptive filter,and can be implied in samrt antenna)

convert from gray to rgb

说明：  主动频率偏移法，是用来检测孤岛效应的。采用S函数描述(Active frequency shift method is used to detect island effect. Function described by S)