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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Abdullah OZCAN
2016년 1월 3일
편집: Walter Roberson
2016년 3월 28일
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
2021년 10월 23일
편집: Kaitlyn Nguyen
2021년 10월 23일
What about OS-CFAR? Do you have sample code for that?
Also how do you calculate the detection?
Thank you!
Amr Aboughazala
2022년 8월 17일
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
2016년 3월 28일
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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