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
am 3 Jan. 2016
Bearbeitet: Walter Roberson
am 28 Mär. 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')
3 Kommentare
Kaitlyn Nguyen
am 23 Okt. 2021
Bearbeitet: Kaitlyn Nguyen
am 23 Okt. 2021
What about OS-CFAR? Do you have sample code for that?
Also how do you calculate the detection?
Thank you!
Amr Aboughazala
am 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
am 28 Mär. 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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