Is there anyway to plot a fft2 function
1 view (last 30 days)
Show older comments
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)
1 Comment
Star Strider
on 13 May 2021
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;
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);
figure
surf(real(x))
grid on
figure
surf(imag(x))
grid on
figure
surf(abs(x))
grid on
.
Answers (0)
See Also
Categories
Find more on Spectral Measurements in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!