njit-etd2003-081 - New Jersey Institute of Technology

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B.2 MATLAB Programs
This section provides the listing of different MATLAB programs used for analysis in this
dissertation.
B.2.1 Test Signal of Three Sinusoids at 0.3, 0.1 and 0.5 Hz
This MATLAB program generates a test signal of three sinusoids with frequencies of 0.3,
0.1 and 0.5 Hz and saves the output signal in an ASCII file called signal_3.asc.
% signal.m
% This is the source code for creating three different signals which each signal
% is made of three sine wave with frequencies of 0.2, 0.5 and 1.0 Hertz. The
% sampling frequency for the all signals is 200 samples per second.
% Each signal is located as a one column of matrix sig_tes. The length of FFT is
% 2048 points.
% The plots of power spectrum are zoomed in. The last two lines of the instructions
% is used to save the figures in Metafile format and then is imported to Microsoft
% word (ver. 6.0a).
V-0:0.005:29.99;
signal_3=[sin(2*pi*0.3*t)zeros(1,1000)sin(2*pi*0.1*Ozeros(1,1000) sin(2*pi*0.5*t)]';
ref=length(signal_3);
Pyy=abs(fft(signal_3,4096));
F=(200*(0:63)/4096)'; %sampling rate 200 sps
T=(ref/200)/(ref-1)*(0:ref-1);
figure(1);
plot(T,signal_3,'r');xlabel('Time(second)');ylabel('Amplitude');
pause
figure(2);
plot(F,Pyy(1:64),'r');xlabel('Frequency(Hertz)');ylabel('Power Density');
save signal_3.asc signal_3 -ascii;