how to write a m file code to cfar for fmcw radar
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how to write a m file code to cfar for fmcw radar can anyone help plz
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Answers (2)
Abdullah OZCAN
on 3 Jan 2016
Edited: Walter Roberson
on 28 Mar 2016
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')
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Kaitlyn Nguyen
on 23 Oct 2021
Edited: Kaitlyn Nguyen
on 23 Oct 2021
What about OS-CFAR? Do you have sample code for that?
Also how do you calculate the detection?
Thank you!
Amr Aboughazala
on 17 Aug 2022
but why offset with addition?
This is different than the scale that have to be multiplied in linear domain. The scale should depend on the desired probability of false alarm.
N = refLength*2;
scale = pbFalseAlarm^(-1/N) - 1;
cfarThreshold=noiseLevel*scale;
is that correct?
Honglei Chen
on 28 Mar 2016
You may also want to take a look at CFAR detector offered in Phased Array System Toolbox. The noise is estimated using training cells that does not include signal.
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