homework1

专家PID控制程序，采用MATLAB软件实现(Expert PID control procedures, the use of MATLAB software)

运用music算法识别空间目标，附有注释，可改变方向角，深入浅出，本科毕设程序，绝对好用。( Space target recognition algorithm using music, annotated, can change the direction of the angle, in simple terms, undergraduate established procedures, the absolute ease.)

说明：  自定义的音频驱动程序支持,该AudioDevice块，船舶与信号处理模块库利用PortAudio沟通与音频硬件(Custom audio driver support, the AudioDevice block, ship and Signal Processing Blockset to communicate with audio hardware using PortAudio)

很不错的一个软件，处理图像拼接的sift算子，可能里面还有那么一点点小错误，但加油可以行的 (There is a small error, but should be able to sift operator)

已知两个序列x[n]=cos(n*pi/2), y[n]=ej*pi*n/4x[n],绘制X(ejw)和Y(ejw)和幅度和相角,说明它们的频移关系(The known two sequence x [n] = cos (n* PI/2), y [n] = ej* PI* n/4 x [n], draw x (ejw) and y (ejw) and amplitude and phase Angle, suggesting their frequency shift relationship )

国外的一份关于802.11n资料的资料，对学习MIMO-ofdm的朋友非常实用。(A information about 802.11 n data abroad, MIMO- ofdm friend very practical to the study)

任意波形源的pwm信号生成电路控制桥式结构 其中上面是双极式调制pwm考虑了上下桥臂不能同时开通（加了延迟）；下面是受限单极式调制pwm信号发生器(Pwm arbitrary waveform signal generating circuit bridge structure wherein the control source is a bipolar modulator pwm at the upper and lower arms can be considered simultaneously opened (with delay) following is limited single modulator pwm signal generator)

用PSO训练BP神经网络(matlab程序)(With PSO training BP neural network (matlab program))

1、验证窗函数 N 变化时，验证其频谱主瓣副瓣比、主瓣宽度的变化。 a)矩形窗函数的 N 变化时，验证其其频谱主瓣副瓣幅度比基本不会发生变化， 而主瓣宽度将会变窄。这说明，当用矩形窗函数设计滤波器时，增大 N 不能使 得阻带衰减减小，但能够减小过渡带。 b)再选取其他的窗如 hamming/hanning 窗，验证当 N 变化时，其频谱主瓣宽 度变化、主瓣副瓣比值变化情况。 2、用窗函数法设计线性相位 FIR 低通，通带截止频率 wp=0.5PI, 阻带截止频率 ws=0.6PI, 阻带衰减不小于 40dB,通带衰减不大于 3dB. a)选取 Hanning,Hamming 窗查看设计出来的 FIR 的过渡带宽和阻带衰减是否 满足要求，二者有什么不同。 b)使用 hamming 窗，将窗长增大 1 倍，设计 FIR。验证同样的窗函数类型 (hamming)，不同窗长度时，设计出来的 FIR 的过渡带宽和阻带衰减都有什么变 化。 3、不使用 Matlab 系统函数得到上一项指标的低通，并与上一项结果比较。 4 用窗函数法设计线性相位 FIR 高通，通带截止频率 wp=0.8PI, 阻带截止频率 ws=0.7PI, 阻带衰减不小于 30dB,通带衰减不大于 3dB.(An actual filter is implemented using the truncated unit impulse response sequence of the ideal filter. For the ideal low pass filter, the unit impulse response h, N, D () is intercepted by a length of N, and the length is The N sequence H (n), when intercepted, guarantees causality and linear phase requirements for the filter. In order to reduce the Gibbs effect, the H (n) window is added, and the appropriate window function is selected to ensure the stopband attenuation and Transition zone requirement. Note that the sidelobe of the window function affects the stopband attenuation of the filter, and the main lobe width affects the filter Transition bandwidth.)

设计IIR滤波器,对滤波器系数按4bit和5bit量化。(Design of IIR filter coefficients of the filter and 5bit quantified by 4bit.)