IWR1642BOOST: High accuracy lab in IWR1642 angle of view it is detecting only in 15 degree

Hi,

In mmwave demo, we are configuring 4rx,2tx by sending .cfg file, but here we send .txt file as load config filr.

So I what part I have to change the code, so that same high accuracy can be detected in more FOV angle. Just iof you could show some screenshot it would be helpful since I have very less time for presenting my application.

Thanks and regards
Karthik s

Karthik,

If the time is limited, I suggest to go with the mmw demo. It's not trivial to update the code for multiple antennas.

It does not matter if it's .cfg or .txt. You could change the type and it still works the same. The change associated with multiple antennas is in the source code, both mss and dss, especially dss datapath c file.

Thanks and Regards,
Michelle

Hi, Ya for time being, will try to use it. Since I had a probl;em with mmwave demo code due to some error, so that I was trying to increase the FOV.

where and all i should change for detecting same high accuracy with 2 Tx and 4 Rx?

if you could give some tips, it wouldbe good

Karthik,

I would suggest to understand the current data path before diving into code update for multiple antennas. Questions you will work out first such as: what data is the peak value is extracted from? accumulative data from all tx/rx and all chirps in one frame or else? How do you plan to place all the data in L3 memory and how to accumulate it. Where do you plan to save the accumulated data? After those answer is clear to you, you'll know where to change in the code.

Thanks and Regards,
Michelle

Ya. But in datasheet of IWR1642 it is given that single antenna can cover, +-40-60 degree. But in this its very less when compared to this value. So what is the limiting for low FOV in high accuracy?
without using 2Tx,4Rx it is not possible to increase the FOV?

Hi,

what exactly is the difference between mmwave demo and high accuracy.

In mmwave demo, what is FOV for 1Tx and 1Rx is it same as high accuracy or diffetrent?

Hi Karthik,

Sorry the previous answer was not pointing in the correct direction since I confused between the azimuth resolution and FOV. FOV depends on the antenna design. The BOOST EVM user's guide www.ti.com/.../swru521b.pdf shows antenna pattern. The azimuth antenna pattern shows angle of +-20 degree for 3dB gain drop. The limitation is hardware board design and not dependent on the demo.

Thanks and Regards,
Michelle

Hi, But in some of the experiments they are able to detect the people whore beyond 20 degrees wrt sensor as shown in visualizer. Is it because of multiple Tx and Rx usage?

I only need range of the object at around 40-60 degrees, with range value what needs to done to achieve this in high accuracy lab? 

is seperate antenna design and interfacing is only solution or any other solution do we have to achieve this?

regards

Karthik s

Hi Karthik,

The antenna pattern shows the range can be up to 120 degree depending how tolerant the object detection configures. +- 20 degree is for 3dB degradation. In other experiments, they may detect multiple objects and objects at 40-60 degree, although reflected signal was weak, was still detected with CFAR threshold set low enough.

In the high accuracy lab, since only the highest peak is detected and reported, any objects in the boresight or nearby may be detected as object and your target at 40-60 is ignored. You may try in anechoic chamber and make sure your object at 40-60 angle is the only one that reflects.

Thanks and Regards,
Michelle

Hi,

Since nechic chamber is difficult for us for testing.

Is it possible to adjust the by changing CFAR threshold, for high accuracy lab, so that object in 40 to 60 degree with weak signal can be detected.

For this what modification needs to be done in high accuracy code?

regards
Karthik

Karthik,

CFAR is not supported in high accuracy lab. Please refer to mmw demo for CFAR implementation.

Thanks and Regards,
Michelle