fm-cw radar

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mohamed al-asklany
mohamed al-asklany 2012-2-22
this is the code of rx of fm-cw radar to get beat frequency is this correct?
%receiver of fm-cw radar
clear all;clc;close all;
%sample frequency
fs=1000;
%time period
t=0:1/fs:1;
%estimat range
r=randint(1,1,100);
rf=randint(1,1,[50 120])
%phase shift
phi=4*pi*r*rf/(3e8);
%reflected signal
echo=cos(2*pi*rf*t-phi);
subplot 211; plot(t,echo);xlabel('t/sec');ylabel('reflected signal/v');title('reflected signal');
%refrance signal
c=cos(2*pi*t*50);
%mixer output
x=c.*echo;
subplot 212; plot(t,x);xlabel('t/sec');ylabel('mixer signal/v');title('mixer output signal');
%low pass filter
[b a]=butter(8,70/500);
%output of LPF
a=filter(b,a,x);
figure;
subplot 211; plot(t,a);xlabel('t/sec');ylabel('filter signal/v');title('LPF output signal');
%calculation of power of extracted signal
op=fft(a,1001)/1000;
op=fftshift(op);
omga0=1; omga=-500:omga0:500;
subplot 212; plot(omga,abs(op));xlabel('FREQ./HZ');ylabel(' FFT');title('amplitude spectrum');
power=sumsqr(abs(op));
%claculation of beat frquency
f=find(op>max(op)-.00001);
fb=501-min(f)

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