IWR6843: People Overhead Counting with IWR6843ISK

Hi Justin,
Thanks a lot for your help !
Thanks for this reminder, but the range of the ODS antenna is quite short,around 20m, isn't it ?

Regards,
Quentin

Hi Quentin,

Range of the ODS at boresight for tracking is about 20 - 25 meters. Theoretical detection on a human is 40 meters, but that will not be consistent enough to track.

For mounting with the sensor facing down (generic overhead mount style), I would expect that field of view would be more limiting than max range.

Quick note: There is code in dss_data_path.c to filter points that are not between 0.5 < y < 2.7. This is for filtering points in the overhead use case. Feel free to remove this if you are side mounting. It is at line 4422 in OOBDemo_angleEstimationAzimElev function.

Regards,
Justin

Thanks for those information !

Yes I'm side mounting, I must remove this filter so thanks!
I have a last question after seeing OOBDemo_angleEstimationAzimElev function.
I want to add a new CLI command to convert data from relative to radar to absolute (giving position of the radar in my working area and azimuth&elevation angles of it).
Until recently I worked with area scanner project and I managed to do it. But I don't know where to do this shift in the overhead ppl counting project, could it be done in the OOBDemo_angleEstimationAzimElev function just before line 4422 ?

Thanks for your help !

Have a nice day,
Quentin.

Hi Quentin,

You could do the shift there. This function takes the 1D FFT data and list of detected points, then finds a angle for each point. It returns the point as a polar coordinate.

You could also make the change in the MSS function. See task_mbox.c It copies the points from the DSS at line 212.

Regards,
Justin

Hi Justin,

I tried the sift here. It doesn't work yet, I'm searching why.  

When I launch Cortex_R4 I have a Debug Error message that I don't understand :

[C674X_0] Debug: Logging UART Instance @00819c30 has been opened successfully

Debug: DSS Mailbox Handle @00813528

Debug: MMWDemoDSS create event handle succeeded

Debug: MMWDemoDSS mmWave Control Initialization succeeded

[Cortex_R4_0] **********************************************

Debug: Launching the Millimeter Wave Demo

**********************************************

Debug: MMWDemoMSS Launched the Initialization Task

Debug: System Heap (TCM): Size: 98304, Used = 2856, Free = 95448 bytes

Debug: MMWDemoMSError: Unsupported Mailbox message id=-18022140

S mmWave Control Initialization was successful

Debug: CLI is operational

[C674X_0] Debug: MMWDemoDSS ADCBUF Instance(0) @00819c00 has been opened successfully

Debug: MMWDemoDSS Data Path init succeeded

Debug: MMWDemoDSS initTask exit

It cames from line 348 of task_mbox.c in Mss project.

Could you explain me the meaning of this error ?

Thanks a lot,

Quentin

Hi Quentin,

That error appears when the DSS sends a message to the MSS, and the MSS does not recognize the message ID. This will not effect the performance of the demo.

Regards,
Justin