rotate elements in phase.ConformalArray

Question

Chen 2018-1-11

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/376763-rotate-elements-in-phase-conformalarray

回答： Honglei Chen 2018-1-15

采纳的回答： Honglei Chen

在 MATLAB Online 中打开

Hello

In the following code, I designed a spiral antenna (sa), and used the sa in a cavity backed spiral antenna (CBSA).

Then I used the CBSA as the element in a 7-element array (DA03) using phased.ConformalArray.

S1 is the incoming signal with SNR 20dB.

After that phased.Collector will collect S1 signal at frequency fc including element response at each element.

The question is when using the 'phased.ConformalArray' to form DA03 array, can I rotate each element to certain angle in xy-plane based on the center of each spiral to simulate elements are not perfectly installed?

%--------------------------------------------------------------------------
sa = spiralArchimedean('Turns',9, 'InnerRadius',1e-3, ...
    'OuterRadius',11e-3);
CBSA = cavityCircular('Exciter',sa,'Radius',12e-3,'Height',....
    25e-3,'Spacing',23e-3);
%--------------------------------------------------------------------------
    N2D=7;
    p(:,1) = [  0.0000;   0.0000; 0]; %DA03
    p(:,2) = [ 25;   7.5; 0]; %DA03
    p(:,3) = [  7.5;  25; 0]; %DA03
    p(:,4) = [-19;  17.5; 0]; %DA03
    p(:,5) = [-26;  -8.3; 0]; %DA03
    p(:,6) = [ -8.3; -26; 0]; %DA03
    p(:,7) = [ 17.5; -19; 0]; %DA03
        p = p*1e-3;
        a=zeros(1,N2D);e=90*ones(1,N2D);
        DA03 = phased.ConformalArray('Element',CBSA,'ElementPosition',p,...
                                                        'ElementNormal',[a;e]);                
    %--------------------------------------------------------------------------    
        fc = 10*1e9;
        Tc=1/fc;
        df = 10e6;    %df/2 is ESM frequency measurement uncertainty   
        WL = physconst('LightSpeed')/fc; %wavelength
        t = linspace(0,2*Tc,400)';
        dt=t(2);      
            SigAz = 10;
            SigEl = 20;            
    % Incoming signals
            S1 = 10*cos(2*pi*fc*t);
            S1=awgn(S1,20,'measured');
    % collect signal        
            collector = phased.Collector('Sensor',DA03,'OperatingFrequency',fc,...
                                    'Wavefront','Plane','Polarization','none');
      yDa = collector(S1,[SigAz;SigEl]);
            svDA = phased.SteeringVector('SensorArray',DA03,...
                                                'IncludeElementResponse',true);   
            A=svDA(fc,[SigAz;SigEl]);

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Honglei Chen 2018-1-15

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/376763-rotate-elements-in-phase-conformalarray#answer_300114

Phased Array System Toolbox currently does not have a parameter for this. Thanks for the question and I'll take note for the request. At this point, the best way to do this may be to create a heterogeneous array, like phased.HeterogeneousConformalArray, and then assign the slightly rotated pattern to each element.

HTH