CFAR thresholding does not depend on the radar type. It is about thresholding the signal at the mixer output. The signal is the amplitude level of range measurements. Here is a sample code. It is only about finding the noise average. This code implements the cell averaging cfar:
close all;
s=randn(1000,1);
s([100, 300, 700])=[30 40 50];
figure,plot(s);
refLength=12;
guardLength=3;
offset=3;
cfarWin=ones((refLength+guardLength)*2+1,1);
cfarWin(refLength+1:refLength+1+2*guardLength)=0;
cfarWin=cfarWin/sum(cfarWin);
noiseLevel=conv(s,cfarWin,'same');
cfarThreshold=noiseLevel+offset;
figure,plot(s);
hold on,plot(cfarThreshold,'r--','LineWidth',2)
legend('Signal','CFAR Threshold')
