AWR1642: Some SRR targets are not at the correct speed

chao huang

Prodigy 230 points

Part Number: AWR1642

1.Hardware:AWR1642 BOOST

2.software:lab0002_short_range_radar

When I test with SRR demo, I find that the speed of some target points is abnormal,as shown in the screenshot。

What causes this exception？

over 2 years ago

0 Aniket Mahajan over 2 years ago

TI__Genius 14846 points

Hi,

Are these objects detected continuously, or intermittently? Depending on this, I will talk to the lab's developer about why this might be happening.

Regards,

Aayush

0 chao huang over 2 years ago in reply to Aniket Mahajan

Prodigy 230 points

Hi,

Some are continuously, some are intermittently.

0 Aniket Mahajan over 2 years ago in reply to chao huang

TI__Genius 14846 points

Hi,

I could also reproduce this. This originates from the Multi hypothesis max velocity enhancement in the lab. This velocity enhancement is done because when different antennas are activated over multiple chirps to get the MIMO benefit of more virtual antennas, the chirp period is effectively decreased by a factor of numTx. This causes the maximum velocity to decrease by numTx as well. The max velocity enhancement tries to mitigate this effect.

I will discuss and try to understand the root cause a little better, and see if anything can be done to side step this issue.

Regards,

Aayush

+1 chao huang over 2 years ago in reply to Aniket Mahajan

Prodigy 230 points

HI，

Thanks for your reply and Looking forward to your solution.

0 Aniket Mahajan over 2 years ago in reply to chao huang

TI__Genius 14846 points

Hi,

I've had a chat with the developer of the lab. For the velocity extension using multiple hypothesis, in the SRR lab for close to 0 velocity objects, sometimes the incorrect hypothesis is accepted. To resolve this, you can disable the velocity extension, but it would reduce the velocity range to half of what it supports right now.

You can find some documentation on the multi hypotheis max velocity enhancement concept in the AoA DPU in the SDK datapath.

Regards,

Aayush

0 chao huang over 2 years ago in reply to Aniket Mahajan

Prodigy 230 points

thanks,I'll check the relevant documents

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AWR1642: Some SRR targets are not at the correct speed