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【Other】 music DL : 0: MUSIC 算法MATLAB仿真源代码 clc clear all format long %将数据显示为长整型科学计数 N=200;%快拍数 doa=[20 60]/180*pi; %信号到达角 w=[pi/4 pi/3]';%信号频率 M=10;%阵元数 P=length(w); %信号个数 lambda=150;%波长 d=lambda/2;%阵元间距 snr=20;%信噪比 B=zeros(P,M); %创建一个P行M列的0矩阵 for k=1:P B(k,:)=exp(-j*2*pi*d*sin(doa(k))/lambda*[0:M-1]); %矩阵赋值 end B=B'; xx=2*exp(j*(w*[1:N])); %仿真信号 x=B*xx; x=x+awgn(x,snr);%加入高斯白噪声 R=x*x'; %数据协方差矩阵 [U,V]=eig(R); %求R的特征值和特征向量 UU=U(:,1:M-P); %估计噪声子空间 theta=-90:0.5:90; %%谱峰搜索 for ii=1:length(theta) AA=zeros(1,length(M)); for jj=0:M-1 AA(1+jj)=exp(-j*2*jj*pi*d*sin(theta(ii)/180*pi)/lambda); end WW=AA*UU*UU'*AA'; Pmusic(ii)=abs(1/ WW); end Pmusic=10*log10(Pmusic/max(Pmusic)); %空间谱函数 plot(theta,Pmusic,'-k') xlabel('角度 \theta/degree') ylabel('谱函数P(\theta) /dB') title('MUSIC算法的DOA估计谱') grid on(MUSIC algorithm MATLAB simulation source code)
Update : 2024-05-08 Size : 15360 Publisher : 冠华
【Other】 bh DL : 0: 航天器动力学代码，依次实现以下要求：（1）给出一组轨道根数OE，求出初始的位置R和速度V。（2）根据轨道根数，用代数方程画出轨道Orbit1 （3）根据初始的位置和速度，用微分方程画出Orbit2 （4）把平面的Orbit1转换为空间的Orbit3，并与Orbit2进行比较（5）把空间的Orbit2转换为Orbit4，并与Orbit1进行比较(The spacecraft dynamics code achieves the following requirements in turn. (1) give a set of orbital elements OE, find out the initial position R and speed V. (2) according to the number of orbital elements, the orbital Orbit1 is drawn by algebraic equation. (3) draw Orbit2 from differential equations based on the initial location and speed. (4) transform the Orbit1 of the plane into the Orbit3 of space and compare it with Orbit2. (5) convert the Orbit2 of space to Orbit4 and compare it with Orbit1.)
Update : 2024-05-08 Size : 2048 Publisher : liu-xt15
【matlab】 gx4 DL : 2: 1、根据LP01模V和W的数值，拟合例题中V在[1.5，2.4]区间的V和W的线性关系式，并给出拟合得到的最大误差。（提示：利用函数polyfit(),polycal()） 2、说明三个传输常数U、V、W以及简并模的概念和意义。 3、结合仿真结果（包括例题中的仿真结果）阐述U、V、W对导波的影响。提示：模式截止、模式远离截止等等(1. According to the values of LP01 modulus V and W, the linear relationship between V and W in [1.5, 2.4] of the fitting example is fitted, and the maximum error of the fitting is given. (hint: use the function polyfit(), polycal()) 2. The concept and significance of three transmission constants u, V, W and degenerate modules are explained. 3. Combined with the simulation results (including the simulation results in the example), the influence of u, V and w on the guided wave is described. Tip: mode cutoff, mode away from cutoff, etc)
Update : 2024-05-08 Size : 51200 Publisher : 伤心灵
【Open-source hardware】 This is a simple Digital voltmeter project mainly focusing on designing condition circuits and demonstrating a use of An DL : 0: Theory behind calculation of Voltage divider circuit. All we want is input voltage to ADC should not increase 5V and Our maximum I/p Voltage to voltmeter is 15V only. So we design the voltage divider circuit as follows. where Vmax is Maximum i/p voltage to voltmeter. Vip is i/p voltage to ADC. R1 and R2 are resistance of voltage divider circuit. Vmax --- | \ / R1 \ / |___ I/p (Vip) | \ / R2 \ / | | V GND Vmax = 15V V = R2*Vmax/(R1+R2) 5/15 = R2/R1+R2 3 = R1/R2+1 2 = R1/R2 R2 = R1/2 Lets take R1 as 200K and R2 will be 100K Maximum current: Imax = (Vmax-Vipmax)/R1 (approx) Vmax = 15V Vipmax = 5V R1 = 200K Imax = (15-5)/200 = 10/200 = 0.02mA
Update : 2021-10-20 Size : 79034 Publisher : arunvtkl

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