IWR6843AOP: Fall detection ( front view)

Hello everyone,

Currently iam testing the fall detection algorithm and i found some problems which leads to false detections or no detection. 

Question 1

1. When iam in front of the sensor when iam falling forward with a normal speed, the "person" goes under the bottom plane and dissapears. this
only happens when iam falling toward or away from the sensor. If i try this again with a lower speed, the person doesn't dissapear and stays in de scene. 

If iam falling sideways it detects much better and stays in the scene. 

Here is the example: 

note: ignore the screen block (TID 16)

Mounting:

2.3m (on wall) 
Elevation ( 15 degrees )

Config settings:

% SDK Parameters
% See the SDK user's guide for more information
% "C:\ti\mmwave_sdk_[VER]\docs\mmwave_sdk_user_guide.pdf"
resetDevice
sensorStop
flushCfg
dfeDataOutputMode 1
channelCfg 15 7 0
adcCfg 2 1
adcbufCfg -1 0 1 1 1
lowPower 0 0

% Detection Layer Parameters
% See the Detection Layer Tuning Guide for more information
% "C:\ti\mmwave_industrial_toolbox_[VER]\labs\people_counting\docs\3D_people_counting_detection_layer_tuning_guide.pdf"
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 12 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 3.0 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 70.0
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

% Tracker Layer Parameters
% See the Tracking Layer Tuning Guide for more information
% "C:\ti\mmwave_industrial_toolbox_[VER]\labs\people_counting\docs\3D_people_counting_tracker_layer_tuning_guide.pdf"
staticBoundaryBox {xMin} {xMax} {yMin} {yMax} {zMin} {zMax}
boundaryBox {xMin} {xMax} {yMin} {yMax} {zMin} {zMax}
sensorPosition 2.3 0 15
gatingParam 3 2 2 3 4
stateParam 3 3 12 500 5 6000
allocationParam 20 100 0.1 20 0.5 20
maxAcceleration 0.1 0.1 0.1
trackingCfg 1 2 800 30 46 96 55
presenceBoundaryBox -3 3 0.5 7.5 0 3
sensorStart

I tried to change the frameCfg, see below. All of this had no effect on the problem.. 

    <numLoops>  224

    <framePeriodiocity> 120

    <frameTriggerDelay> 10 ms

Question 2

2. When iam further away from the sensor 3/4 meter, the height of the person isn't correct ( lower) . Is there a parameter in the config file
that i need to tune, or is there another solution?

Does anyone knows how i fix this issues, maybe with tuning other config settings?

Kind regards, 

Marnick