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Author Topic: Automotive Radar Using FMCW
honglei.ch-
en
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Post Automotive Radar Using FMCW
on: December 28, 2012, 18:04
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Here is an example simulating automotive radar using MATLAB. I would love to hear your comment on this. One thing didn't show in the example is how to distinguish between multiple targets using triangle sweeps. I can find literature regarding how to address that using some complicated waveforms but are there easier and cheaper ways to do that? If you have good resources for automotive radars, both long range and short range, please point me to them. Thanks.

http://www.mathworks.com/help/phased/examples/automotive-adaptive-cruise-control-using-fmcw-technology.html

charvatg
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Post Re: Automotive Radar Using FMCW
on: January 1, 2013, 13:15
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That is a terrific explanation.

What do you mean by distinguishing between multiple targets? Is this assuming the range resolution is not sufficient?

Not sure if this helps, but here is a demo of an actual UWB FMCW radar:

You can download the data from this experiment:
http://www.glcharvat.com/book_short_range_radars/ch3_FMCW/xband_FMCW.zip

Unfortunately i only recorded the up-chirps and it is for human targets walking. It would be great if someone records some data of a radar like this in a moving vehicle.

Greg

honglei.ch-
en
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Post Re: Automotive Radar Using FMCW
on: January 2, 2013, 23:27
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What I mean is that if I do triangle sweeps on multiple targets, then I need to find a way to pair the upchirp and downchirp beat frequencies from each target. I'm wondering if there is a simpler algorithm available for me to achieve that.

The video is not working for me right now. It asks me to try later so I'll probably do so.

Honglei

Y3G
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Post Re: Automotive Radar Using FMCW
on: December 20, 2013, 10:02
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Hi
This is a very interesting topic Honglei.
Could you complete you trials with the coffee can radar.
Currently I have difficulties to get Left SYNC pulse into the mic input, since my mic input has only one channel...
I thought the down chirp algorithm could give me a solution for that...
Keep me posted if you found a way to implement it.
Many thanks in advance
Y3G

drick
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Post Re: Automotive Radar Using FMCW
on: April 18, 2014, 16:39
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Each DFT peak represents a line in Delay-Doppler space. Lines from the up-chirp slant one way, while those from the down-chirp slant the other. Intersections represent true target positions in Delay-Doppler space. To resolve ambiguity with multiple targets, try using two or more different chirp slopes.

There has been a lot of recent work on modulation schemes for automotive radar. This Rohde & Schwarz white paper provides a good overview.

http://cdn.rohde-schwarz.com/dl_downloads/dl_application/application_notes/1ma239/1MA239_0e_Radar_Waveforms_for_AD.pdf

Although some of these modulation waveforms look complicated to produce, an ADF4148 synthesizer chip can do most of them.

David

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