AWR1642BOOST: Phase accuracy for accurately detecting small displacements.

Arno Van Hoek

Prodigy 30 points

Part Number: AWR1642BOOST

Dear TI

I was wondering how accurately can the AWR1642-Boost measure the Phase difference ?

Since the Docs "Driver Vital Signs – Developer’s Guide" state that Delta phi=4pi/lambda*(delta R)

Meaning that the phase difference defines the accuracy of the measurement (delta R).

Our goal would be to go into the sub 10micrometer range. To know if we can we need to know the accuracy of delta phi.

We did see that the matlab code calculate these value with 8 decimals. But we don't that is that's is the the actual accuracy. ( "main_readGUISavedBinary.m")

over 6 years ago

0 Cesar over 6 years ago

TI__Guru*** 148974 points

Hi,

Please see computation example provided in Slide 26

training.ti.com/.../mmwaveSensing-FMCW-offlineviewing_0.pdf

If we consider deltaR = 10-6m, since at 77Ghz, 1mm -= lambda/4, delta_phi = PI*10-3 ~ 0.00314.

I think the phase change is too small.

Let me get additional insight from our research team

thank you
Cesar

0 Cesar over 6 years ago in reply to Cesar

TI__Guru*** 148974 points

Hi

I checked with developer of the Vital Signs Demo and he mentioned that it would be possible to achieve sub 10micrometer range by increasing the SNR. For example using a lens.

Thank you
Cesar

0 Arno Van Hoek over 6 years ago in reply to Cesar

Prodigy 30 points

Dear Cesar

Thank you very much for your reply.

So with the vital sign demo a sub 10 micrometer range can be achieved with the use of lenses.

So in further development we would like to step of the vital sign demo.

and when we do this what would we the minimum phase accuracy we can measure?

I understand that this depends on a lot of parameters.

But are the cases known of phase measurements down to the 0.05 to 0.1 degree range ?

0 Cesar over 6 years ago in reply to Arno Van Hoek

TI__Guru*** 148974 points

Hi

Please see this paper about phase accuracy information vs. SNR

ieeexplore.ieee.org/.../8378778

I will close this thread now.

Thank you
Cesar

0 Arno Van Hoek over 6 years ago in reply to Cesar

Prodigy 30 points

thank you for your help.

with the use of that paper we where able to establish the phase accuracy in our radar

Kind regards Arno

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AWR1642BOOST: Phase accuracy for accurately detecting small displacements.