matlab_calculator

this is about powerfactor correction circuit

提取图像中的红色，并且使红色部分变为白色，其余部分变为黑色。(get the red color area from a picture, and turn the red part into white, and the rest into black)

matlab写的单点定位程序，可以读取星历文件计算接收机坐标(Matlab write single point positioning program, can read the star calendar file calculation receiver coordinates)

Second order elliptic partial differential equations，二阶椭圆型偏微分方程求解程序(Second order elliptic partial differential equations)

本文利用软件相移技术得到相互正交的参考正弦波信号；通过互相关算法，完成了软正交矢量型LIA相关器的具体实现；利用该方法实现了对微弱信号幅值和相位的检测，有效地抑制干扰，减少了硬件电路成本。通过Matlab仿真，验证了该算法具有一定的优越性。(In this paper, the software technology is orthogonal to the phase shift of the reference sine wave signal through cross-correlation algorithm to complete the implementation of soft orthogonal vector LIA correlator achieved using this method for detecting a weak signal amplitude and phase, effectively suppress the interference and reduce the cost of the hardware circuit. By Matlab simulation show that the algorithm has certain advantages.)

对已知的以为数据进行FFT变换，得到数据的频谱图，进而可分析出幅值和相角。(Known that the data FFT, the frequency spectrum of the data, which can be analyzed magnitude and phase angle.)

说明：  无线传感器网络中经典定位算法：dv-hop算法的实现(Wireless sensor network localization algorithm in the classic: dv-hop algorithm implementation)

说明：   采用一种不完全的微分算法，被控对象为时滞系统。对象的输出端加的随机信号，幅值0.01.采样时间是20ms。(PID Controler with Partial differential)

matlab需要那么复杂的多重积分,实在没办法才考虑使用.一般来说,积分中带有参数,无论是被积表达式或者说积分限都是相当麻烦的,求解消耗的时间非常多.............数值积分才是解决问题的通法,可以自己调节精度~(it is good. If you visited Indianapolis you would be able to find your way around easily because most of the streets corss each other like a chessboard(棋盘). In the center of the city, called the Circle, stands the Soldiers and Sailors’Monument, 100 Meters high. Also in the center there are many buildings made of the famous Indiana stone, which makes them white in color.)

语音信号处理Matlab MATLAB-based digital signal processing and Practice Development(Speech Signal Processing Matlab)