Is there anyway to plot a fft2 function

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matlabuser1 2021-5-13

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https://ww2.mathworks.cn/matlabcentral/answers/828893-is-there-anyway-to-plot-a-fft2-function

评论： Star Strider 2021-5-13

fc = 24e9;              
c = 3e8;                
lambda = c/fc;
p = 25;                 %number of pulses
n = 25;                 %samples collecetd for each pulse
bw = 300e6;             %300 M hz bw
T = 300e-6;
k= bw/T;
v1 = 45;
v2 = 0
fd1 = (2*v1)/lambda;
fd2 = (2*v2)/lambda;
R1 = 150;                %Range 1 20 m
R2 = 50;                %Range 2 10 m
tau1 = (2*R1)/c;
tau2 = (2*R2)/c;
To1= T + tau1;            %To for target 1
To2 = T + tau2;           %to for target 2
fs = 300e6;
%fs1 = 1/To1;                %sampling frequency for target 1
%fs2 = 1/To2;
for ii=1:p
    for ii=1:n
        
    
        a = exp(1i*2*pi*((((2*k*R1)/c)+fd1)*(n/fs)+(fd1*p*To1)+((2*fc*R1)/c))) ;
        b = exp(1i*2*pi*((((2*k*R2)/c)+fd2)*(n/fs)+(fd2*p*To2)+((2*fc*R2)/c))) ;
        w = a + b ;
    end
end
x = fft2(w,n,p)
plot(w,x)
%z = getMatchedFilter(x);
%matchedfilter = phased.MatchedFilter(...
 %   'Coefficients',z,...
	%'SpectrumWindow','Hamming');
%matchFiltered = step(matchedfilter,beamformed);
%load RangeDopplerExampleData;
%hrdresp = phased.RangeDopplerResponse(...
  %  'RangeMethod','FFT',...
   % 'PropagationSpeed',c,...
    %'DopplerOutput','Speed','OperatingFrequency',fc);
%plotResponse(hrdresp,...
 %   x,w,...
 %   'Unit','db','NormalizeDoppler',true)
%plotresponse(x,n,p)
%% The above code display a matrix that is 25X25 to represent a data cube. Is there anyway to take that data that is being displayed 
%%fft2 and display teh speed an location of the twoo objects in teh code.
%%The objecyt are denoted (v1,R1) and (v2,R2)

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Star Strider 2021-5-13

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Use any of the surface plotting functions.

However, since ‘w’ is a scalar, the Fourier transform will be a constant.

Both loop counters are the same ‘ii’ variable, nothing in either ‘a’ or ‘b’ ever changes, and ‘w’ is not subscripted to create a matrix. I leave those corrections to you.

fc = 24e9;

c = 3e8;

lambda = c/fc;

p = 25; %number of pulses

n = 25; %samples collecetd for each pulse

bw = 300e6; %300 M hz bw

T = 300e-6;

k= bw/T;

v1 = 45;

v2 = 0;

fd1 = (2*v1)/lambda;

fd2 = (2*v2)/lambda;