AWR1642: Clutter removal

Hi,

We have noticed that when a strong reflector is used there could be FFT leakage even if clutter removal.

Thank you

Cesar

Hello,

Thank you for your answer.

Could you tell me more about why objects which have zero doppler index are detected even if clutter removal is enabled?

Hi,

I will need a few days to check with our systems team for theoretical explanation

thank you

Cesar

Hi,

I look forward to your reply.

Thank you

Cesar

Hi,

I have discussed your observations with the systems team and we reached the following conclusions:

The Clutter Removal is not designed to be used when the sensor is moving.

Clutter Removal is designed to be used in an environment where

• the sensor is static
• there are static and moving objects around the sensor
• Clutter Removal is designed to remove the static objects in the environment described above.

When sensor is moving the zero-Doppler bin no longer represents the Static clutter in the scene. Because of the relative movement of the sensor with respect to the other objects in the scene, these other objects would appear at different Doppler bins. Enabling Clutter Removal does not make sense

thank you

Cesar

Hi,

Thank your for your answer.

I understood when sensor is moving, there are only moving objects around the sensor and in that environment clutter removal does not make sense.

But in that environment, I think since there is no static object originally, object that has zero doppler index is not detected, but in the above figure, zero doppler object is detected. Please see 'range profile for zero doppler' plot.
Do you have any ideas why it occurs?

You are correct, clutter removal does not make sense in this environment.

In addition, THERE IS NO MORE ZERO DOPPLER. Since the sensor is moving what used to be zero doppler when the sensor was not moving is now in a doppler bin and detection will happen

Does this answer your question

thank you

Cesar

Hi,

Thank you for your answer.
I think I am not fully understanding.

Please see 'range profile for zero doppler' chart that I posted first.

If clutter removal is enabled, I think there is no 'orange dots' in the chart, because orange dots mean detected object and there is no static object when sensor is moving. But the figure I posted, there is a orange dot (detected object) in the chart.
Do you have any ideas why it occurs?

Hi,

My understanding of the experiment is as follows:

1) the board is moving

             - with moving board clutter removal does not matter.

2) there is one object detected.

This is expected behavior. Why don't you expect this?

Thank you

Cesar

Hi,

Thank you for your answer.

Regarding 2), I can’t understand why objects that have zero doppler are detected. Though clutter removal doesn’t make sense, there is no zero doppler object.

For example, is there possibility that object detection on zero doppler index is caused by spectrum leakage from non zero doppler object?

Hi,

I think I understand now your question.

Let me discuss with systems team and get back to you

Cesar

Hi,

I have discussed with systems team.

They suggested you disable the Clutter Removal and perform the experiment with moving EVM again.

Let's see if you can detect and object again.

Thank you

Cesar

Hi,

I disabled clutter removal(all objects can be detected), and performed the experiment with moving EVM.

Then some objects that have zero doppler index were detected.
(There are some orange dots on 'Range Profile for zero doppler' chart)

Let me check with systems team and get back to you

thank you

Cesar

Hi, 

Thank you for your answer.

I will close this thread.