PLL_Design_3_costas

this paper desctibes one of new method in photovoltaic issues. nice information included

偏微分方程有限元的数值解的matlab程序，具有较好的实用性，方便大家使用和参考。(Partial differential equations finite element numerical solution matlab program, with good usability, to facilitate the use and reference.)

matlab 生成dtmf 进行双频合成(dual-frequency synthesizer for generating dtmf matlab)

生成3GPP SCM信道，内含pdf文档包含对程序的详细说明。(3GPP SCM channel generation, including pdf document contains a detailed description of the program.)

人脸识别的pca算法,可以运行，是源代码(Face recognition pca algorithm, you can run source code)

matlab时频分析配套源码第6章的程序，请大家共享(Matlab time-frequency analysis supporting source Chapter 6 of the procedures, please share)

采用传输矩阵法，用matlab编程计算的一维光子晶体的能带结构，方法简单，速度快，同时可计算透射系数(Using transfer matrix method, calculated with matlab programming one-dimensional photonic crystal band structure, the method is simple, fast, and calculate the transmission coefficient)

把激光陀螺捷联惯导系统和GNSS接收机固联于实验车实验仓中，接收机天线固联在实验车实验仓上方，车载计算机实时接收和采集惯导系统、卫星导航接收机的原始数据，在郊外开阔公路进行车载实验。 通过matlab编程实现卫星导航伪距单点定位、INS/GPS松组合导航的全过程。 1）卫星导航单点定位测速：利用采集得到的接收机时间、伪距、多普勒频移数据，要求进行单点定位、测速解算，输出接收机的位置、速度随时间的变化曲线，并给出位置、速度误差曲线； 2）松组合导航：结合惯导解算和卫星接收机单点定位测速，要求采用Kalman滤波器实现惯导/卫星位置、速度组合导航解算，滤波器维数至少包括惯导的位置、速度、姿态角9维。将组合导航后的姿态角与纯惯导的姿态角进行对比分析，给出位置、速度误差曲线。(The laser gyro strapdown inertial navigation system and GNSS receiver are fixed in the experimental compartment of the experimental vehicle. The antenna of the receiver is fixed above the experimental compartment of the experimental vehicle. The on-board computer receives and collects the original data of the inertial navigation system and satellite navigation receiver in real time, and carries out on-board experiments on the suburban open highway.)

研究信道编码，测试程序，为保障有效运行，请注意安装环境软件的版本正确与否(study for channel coding)

说明：  利用子程序fast-lot.m,实现对该图像的变化及压缩，并和以为信号做dct后的图像质量相比较。(Using subroutine fast-lot.m, to achieve the changes and compression of the image, and after, and that the signals do dct compare the image quality.)