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Author Topic: Capturing Signal on PC
enginefrea-
k
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Posts: 14
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Post Capturing Signal on PC
on: February 11, 2013, 07:07
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We're having good progress with the radar. We finally got a clean signal but we're a bit hazy on the signal processing. Quick question, how do we record the signal so we could process it on the computer? Here are some of the things we tried, and we just want to make sure we're on the right track:

1. The default Sound Recorder software from windows. It receives a signal on Channel 2 (no signal appears on Channel 1) with a sample rate of 44100.
2. Recording in Adobe Audition with the same sample rate, it shows the signal for both channels. And when processed in MATLAB it shows a signal such as this:

Image

3. Lastly we tried recording using MATLAB with the same sample rate, and got a signal very similar in Audition.

Image

enginefrea-
k
Newbie
Posts: 14
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Post Re: Capturing Signal on PC
on: February 12, 2013, 08:36
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We already figured out the Doppler portion. But we are having trouble with Ranging. The Vtune is connected and the Sync Pulse switch is turned on. Do we need to do anything else or are there things we need to check?

Below is the signal we are getting in ranging (a person walking). What do you guys think of the output? I'm not sure what I did wrong.

Image

enginefrea-
k
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Posts: 14
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Post Re: Capturing Signal on PC
on: February 13, 2013, 00:02
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Lastly, we're trying to figure out if it's possible to get the direction of the incoming signal based on the output. Is that possible? Any help is appreciated.

PS Thanks for all the help guys. :)

enginefrea-
k
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Posts: 14
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Post Re: Capturing Signal on PC
on: February 20, 2013, 01:14
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Still not getting progress. Does anyone have any experience on this matter? Thank you again!

charvatg
Administrator
Posts: 115
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Post Re: Capturing Signal on PC
on: February 20, 2013, 07:33
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Looks like you almost have it. I suggest Audacity.
http://audacity.sourceforge.net/

You need to record on one channel (right only) for the Doppler Experiment. I suggest you try the Doppler first. Don't forget to un-hook the Vtune pin from your VCO (oscillator).

You must record in both right and left for ranging and imaging.

Try that out and post an update here.

Good luck!
Greg

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