IWR6843ISK: Vital Sign Demo Questions - au

chunghee cho

Expert 1180 points

Part Number: IWR6843ISK

What is the unit of Range Profile in vital signs lab?

Best reagards

ch cho.

over 5 years ago

0 Connor Desmond over 5 years ago

TI__Expert 7510 points

Dear Chunghee:

The range profile shows how far away the target(person) is away from the sensor. I noticed that the scale on the image you shared was up to 250m. This scale needs to align with the distance the target that you are measuring is away from the sensor. Here is a link to another thread that will give additional instruction than what is included in the user guide to assist on getting good measurements.

https://e2e.ti.com/support/sensors/f/1023/t/827991

Best regards,

Connor Desmond

0 chunghee cho over 5 years ago in reply to Connor Desmond

Expert 1180 points

I know that the x-axis means distance.

I want to know what the y-axis value is.

Best regards,

CH Cho.

0 Connor Desmond over 5 years ago in reply to chunghee cho

TI__Expert 7510 points

Dear CH Cho:

a.u. stands for Arbitrary Unit. Here is link that describes what that means:

https://en.wikipedia.org/wiki/Arbitrary_unit

With regards to the demo the y axis is simply a representation of a relative measurement of magnitude. This means that the higher the value at a given distance the better the certainty that there is indeed a detected object at that distance. Beyond that I would refer you to the source code for the GUI located in the Industrial Toolbox to look explicitly at how that relative measurement is calculated.

PATH: <Industrial Toolbox Install Path>\labs\vital_signs\68xx_vital_signs\gui\gui_source

Best regards,

Connor Desmond

0 kisub Jung over 5 years ago in reply to Connor Desmond

Intellectual 930 points

we understand this is magnitude and arbitrarily re-sized.

Our question was what is the unit ? is it Watt? is Db?

By looking into the source code, we found it out it is from Ar which is received signal power.

It looks like Watt.

So, Ar look like power unit, not SNR ratio unit.

Is it correct?

I was confused due to this table. It showed Trasmit Power is dBm which is SNR unit. Not pure mW power unit.

based upon the above table, reversely , In my opinion, it sounds like dBm unit, not circuit mW power unit.

Please correct me if I am wrong.

Thanks.

kisub

0 Connor Desmond over 5 years ago in reply to kisub Jung

TI__Expert 7510 points

Dear Kisub:

The following question has been asked and answered in other threads. Here is a link to those threads.

https://e2e.ti.com/support/sensors/f/1023/t/622722

Best regards,

Connor Desmond

Sensors

Sensors forum

IWR6843ISK: Vital Sign Demo Questions - au