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Author Topic: Range vs. Time processing
barrera_05
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Posts: 2
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Post Range vs. Time processing
on: April 10, 2013, 18:30
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I have been reviewing the Matlab script for RTI processing. I was wondering how max_range was derived? Does anyone know a good reference for this?

charvatg
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Posts: 115
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Post Re: Range vs. Time processing
on: September 2, 2013, 21:09
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Radar Handbook, by Skolnick has a chapter on FMCW radar, should answer the question.

Greg

Y3G
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Post Re: Range vs. Time processing
on: December 22, 2013, 10:53
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Hi Greg,
I wonder If one can skip the SYNC channel input (the one that gives the 20 ms pulse from the XR2206, i think the Right Channel) and do an approximation of the 20 ms.
The example uses this pulse as synchronization to distinguish between the received signal from the downchirp, which is ignored.

In the Matlab file, you do it simply by aligning time the index array of the channel 1 (Pulse) and channel 2 (Received Signal).

---------------------------------------------------------------------------
%parse the data here by triggering off rising edge of sync pulse
count = 0;
thresh = 0;
start = (trig > thresh);
for ii = 100:(size(start,1)-N)
if start(ii) == 1 & mean(start(ii-11:ii-1)) == 0
%start2(ii) = 1;
count = count + 1;
sif(count,:) = s(ii:ii+N-1);
time(count) = ii*1/FS;
end
end
-------------------------------------------------------------

what if I do an approximation of the received signal and do a sort of "sliding match". I will have to figure out in MATLAB how to do it.

Reason for that is because I do not have a 2nd Input channel to sample from...

Many thanks for anyone to reply, and merry C'mas

charvatg
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Posts: 115
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Post Re: Range vs. Time processing
on: December 26, 2013, 08:33
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Sure, that might work. The ramp generator should be consistent enough for this to work, but BTW it will not be exactly 20ms. What you can do is calibrate the radar against a stationary target and look at where the waveform repeats itself, use this as the start index and process every so period. Remember, its an up and down ramp and all we do is process the down ramp.

Good luck!
Greg

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