DCA1000EVM: Sporadically observing some negative range components after processing IQ data.

Gayatri Menon

Part Number: DCA1000EVM
Other Parts Discussed in Thread: IWR1642BOOST

Tool/software:

Hi,

I am sporadically seeing some negative range components after processing IQ data. Please see the image (Unexpected response image) below. You can see some sort of mirror image in the negative range area. I am using TI IWR1642BOOST and DCA1000EVM for the capture.

This is always not the case. Sometimes the same script gives the correct response

(In the images below images Y axis is range, x is doppler/angle)

Unexpected response

Expected response

Could you please help us understand why this could be happening.

Thank you

Regards

Gayatri

over 1 year ago

0 Nathan Block over 1 year ago

TI__Mastermind 37805 points

Hi,

The radar physically cannot detect objects behind it. Perhaps you're not doing the correct FFT shift in your processing script. There should be no negative range axis.

Best,

Nate

0 Gayatri Menon over 1 year ago in reply to Nathan Block

Intellectual 806 points

Hi Nathan,

Thanks for the response.

If its FFT shift issue, I would expect the issue to be consistent. But it's sporadic, I have to run the script multiple times to recreate the issue.

Is there any other possible cause for this?

Thanks

Regards

Gayatri

0 Nathan Block over 1 year ago in reply to Gayatri Menon

TI__Mastermind 37805 points

Hi Gayatri,

What is the script you're using to process the information? Is it a TI tool?

Best,

Nate

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DCA1000EVM: Sporadically observing some negative range components after processing IQ data.