AWR6843AOPEVM: Height measurement changes when moving away from the sensor - people counting/fall detection

Hello,

The sensor is mounter at 1.82m, with an elevation of 10 degrees.

The issue occurs at every distance.

When I stand 30cm away from the sensor, my height is 150cm, when I move to 130cm away, my height is 130cm and when I'm at 280cm away, by height was only 90cm. 

I checked the height using both the centroid height and the height of the highest point in the target.

When we move away, we can see something like a linear drop from the height values. 

This problem will cause errors in some fall detection cases.

Hi, it still occurs at 0 deg elevation.

Cheers,

Danh

Hi,

The height is determined by using the point with the highest Z coordinate in the target. The sensor is wall mounted. The code is based on the people counting lab.

Thanks

Hi, I'll be waiting for your reply. Here's the chirp config I'm using:

"""

sensorStop
flushCfg
dfeDataOutputMode 1
channelCfg 15 7 0
adcCfg 2 1
adcbufCfg -1 0 1 1 1
lowPower 0 0
profileCfg 0 60.75 30.00 25.00 59.10 394758 0 54.71 1 96 2950.00 2 1 36
chirpCfg 0 0 0 0 0 0 0 1
chirpCfg 1 1 0 0 0 0 0 2
chirpCfg 2 2 0 0 0 0 0 4
frameCfg 0 2 96 0 55.00 1 0
dynamicRACfarCfg -1 4 4 2 2 8 12 4 8 5.00 8.00 0.40 1 1
staticRACfarCfg -1 6 2 2 2 8 8 6 4 8.00 15.00 0.30 0 0
dynamicRangeAngleCfg -1 0.75 0.0010 1 0
dynamic2DAngleCfg -1 1.5 0.0300 1 0 1 0.30 0.85 8.00
staticRangeAngleCfg -1 0 8 8
antGeometry0 -1 -1 0 0 -3 -3 -2 -2 -1 -1 0 0
antGeometry1 -1 0 -1 0 -3 -2 -3 -2 -3 -2 -3 -2
antPhaseRot 1 -1 1 -1 1 -1 1 -1 1 -1 1 -1
fovCfg -1 70.0 20.0
compRangeBiasAndRxChanPhase 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0
staticBoundaryBox -1.3 1.5 0.85 4 0 2.67
boundaryBox -1.3 1.5 0.7 4 0 2.67
sensorPosition 1.82 0 10
gatingParam 3 2 2 2 4
stateParam 4 4 8 100 5 6000
allocationParam 60 200 0.1 35 0.5 20
maxAcceleration 0.1 0.1 0.1
trackingCfg 1 2 600 4 46 96 55
presenceBoundaryBox -1.3 1.5 0.7 4 0 2.67
sensorStart

"""

The setup looks like this:

Where the sensor is 1.82m high with an elevation of 10 degrees. When a target moves further away from the sensor, doing the same action (in my case shaking the head so point clouds are generated there), we can see that the height of the object drops linearly when they are further away, and increases when they move closer. Here, the subject is 1.55m tall in real life, and how it's shown when he walked away from the sensor, doing the same action

You can see the slope going down.

Thanks.

The plot axis are y- height and x - distance from sensor.

Hello, do you have any updates regarding this height problem?