using subplot with imaginary and real

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Meshaal Mouawad 2019-11-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/489040-using-subplot-with-imaginary-and-real

回答： JESUS DAVID ARIZA ROYETH 2019-11-4

采纳的回答： JESUS DAVID ARIZA ROYETH

I want to use subplot for the imagenary part and the real part, is my code correct?

Screen Shot 2019-11-03 at 6.53.51 PM.png

c=3e8; % speed of light m/s

M=50; % 50 pulses

M_samples=M-1;

m_th= 0:1:M_samples; % m_th pulses

v=30; % the radial velocity 30m/s

f_t= 3e9; % frequency of 3.0 GHz

tau= 1e-6; % a pulse width of 1 microsecond

PRF=4e3; % a PRF of 4.0 KHz

R_0=40e3; % an initial range of R0 = 40 km

A=1; % set A to 1

theta=0; % set theta to 0

% calculate

PRI=1/PRF; % find PRI

T = PRI; % T = PRI

f_d=(2*v*f_t)/c; % Calculate the Doppler frequency Hz

m_calc=R_0/(v*T); % calculate m in equation 8.2

t_m= m_calc*T; % claculate the transmited times for the m_th pulse

t_m_2= m_th*T; % estimate the transmited times for the m_th pulse

%

% Equation 8.28

%

y_1=A*exp(i*((2*pi*f_d*t_m)+theta)); % Calculate Equation 8.28 the data y

y_2=A*exp(i*((2*pi*f_d*t_m_2)+theta)); % Estimate Equation 8.28 the data y

% b) Using subplot, plot in subplot(2,1,1) the real portion of y. In subplot(2,1,2), plot the imaginary portion.

% Let the x axis be the time of each pulse number (number pulses from 0 to M?1), in msec.

%

subplot(2,1,1);

plot (m_th,real(y_2));

subplot(2,1,2)

plot(m_th,imag(y_2));

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Answer 1

JESUS DAVID ARIZA ROYETH 2019-11-4

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/489040-using-subplot-with-imaginary-and-real#answer_399616

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yes in that case, graph real and imaginary part, the only recommendation is that you put 1i instead of i so that it is not confused as a variable

c=3e8;                                 % speed of light m/s
M=50;                                  % 50 pulses
M_samples=M-1;                         
m_th= 0:1:M_samples;                   % m_th pulses 
v=30;                                  % the radial velocity 30m/s 
f_t= 3e9;                               % frequency of 3.0 GHz
tau= 1e-6;                              % a pulse width of 1 microsecond
PRF=4e3;                                % a PRF of 4.0 KHz
R_0=40e3;                               % an initial range of R0 = 40 km
A=1;                                    % set A to 1
theta=0;                                % set theta to 0
% calculate
PRI=1/PRF;                             % find PRI
T = PRI;                               % T = PRI
f_d=(2*v*f_t)/c;                       % Calculate the Doppler frequency Hz
m_calc=R_0/(v*T);                      % calculate m in equation 8.2
t_m= m_calc*T;                         % claculate the transmited times for the m_th pulse
t_m_2= m_th*T;                          % estimate the transmited times for the m_th pulse
y_1=A*exp(1i*((2*pi*f_d*t_m)+theta));         % Calculate Equation 8.28 the data y
y_2=A*exp(1i*((2*pi*f_d*t_m_2)+theta));       % Estimate Equation 8.28 the data y
subplot(2,1,1);
plot (m_th,real(y_2));
subplot(2,1,2)
plot(m_th,imag(y_2));