AWR6843AOP: Will car heated seats or heated seat cushions affect 60GHZ life detection?

Hi,

No, car heated seats will not affect life presence detection with our mmWave devices. Our presence detection is based solely on the motions of objects in the vehicle. The small motion of a baby's chest expanding as it breaths triggers is detected as a presence. As the seats are not moving objects, they do not get picked up and detected as a presence. This is also the case with any other inanimate objects found in the vehicle.

Best Regards,
Kevin

Thanks for your prompt reply.

Another question is that "Could it possible to support some vital sign assisted for the OMS?"

For example, except to detect the number of movement points for the head/body/leg...etc, also to check 2 rows passengers (In-Cabin, max 5 people) vital sign (It should be respiration instead of heart rate).

As I know, radar need to focus on the position of chest for the vital sign detection.

Many thanks.

Hi,

Yes, you can find a "vital signs" example at the below link. This lab demonstrates the device's ability to monitor people's heart and breathing rates.

https://dev.ti.com/tirex/explore/node?node=A__AMK61TkbsnY89Axyqsuxmw__radar_toolbox__1AslXXD__LATEST

Best Regards,

Kevin

Hi Kevin,

We have done two 60GHz radar application, one is OMS, another one is vital signs.

We found there is an stringent conditions for the vital sign, for example: the antenna should face to the chest and it can only detect one person.

We would like to monitor all passengers (Max is 5 persons) inside the vehicle, could it possible do below:

1. Radar check movement points inside the vehicle, it detect any person inside the vehicle.

2. To prevent false alarm, we hope to detect respiration for each person, if we found that is alive objects (Animal, person...).

Best,

Richard

Hi Richard,

You can definitely monitor the interior of a car to detect up to 5 people. However, the challenge comes when trying to accurately capture their breathing rates. If the car is on and moving, the vibrations of the vehicle and the vibrations of the people would introduce phase differences in the same frequency range as their breathing rates. Essentially, this introduces noise and makes it difficult to accurately monitor breathing. It is feasible, but would take a lot of processing and machine learning to accomplish.

We have attempted to do a single person's vital signs in a stationary car and have seen successful results. However, we have no demo for multiple people or for a moving vehicle.

That being said, our current presence detection example already has a way to discern inanimate objects from living objects to avoid false detection. This is done through clutter removal, which basically filters out the objects found to have very low doppler values (stationary objects). Capturing specific breathing rates is not necessary for presence detection.

Best Regards,

Kevin

We would like to meet Euro NCAP In-cabin monitoring system requirement for the raking.

Thus, condition to active radar detection is simple, after engine off (Vehicle is static, no on & no moving).

In such condition, we hope to use the same radar to monitor all passengers (max. 5 persons) vital sign to discern inanimate objects from living objects to avoid false detection. 

Hope got more information from you.

Besides, there is one company "AZCOM" which use AWR6843AOP as well to do ICMS (In-cabin monitoring system), it claims that support detection breathing.

Hi Richard,

The presence detection chain in our demo relies on the minor motion of our breathing to determine whether there is a presence or not. We have found that it is quite resistant to false detections as it relies on movement to trigger a presence detection. However, to your point, our demo does not measure and quantify breathing rates.  

It might be challenging to achieve vital signs monitoring for 5 people with a single sensor. But there are third party partners that might have more emphasis on vital signs and would be able to provide a solution with a bigger emphasis on vital signs. AVDS is one such example, they've implemented mmWave vital signs solutions. Please see below tool to search through our third parties!

https://www.ti.com/tool/MMWAVE-3P-SEARCH

Best Regards,

Kevin 

Kevin,

We tested with Fans, it detected as OMS (One person).

Therefore, we would like to know "it is quite resistant to false detections", what kind of obstacles have been tested?

How about the moving obstacles? Like: bottom water, fans...etc.

Many thanks.

Hi,

Moving objects will be detected. Stationary objects such as backpacks, luggage, laptops were tested.

Best Regards,

Kevin 

Kevin,

That might be few moving objects in cabin after engine off, Ex: mini-fans (Sometimes used by child in summer), un-empty bottled water...etc.

How about these cases?

Thanks.

Hi,

I got more details from experts internally. We also tested with water bottles and these did not trigger false detections. Depending on your implementation, you can definitely avoid false detections of all the objects you've mentioned. Please feel free to reach out to our sales team to facilitate and get more info privately.

Best Regards,

Kevin