• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 29 subscribers
  • Views 631 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

AWR1843AOPEVM: Obstacle Detection: Improve Detection of Objects and reduce ghost points

Ayush Shetty
Prodigy 80 points
Part Number: AWR1843AOPEVM
Other Parts Discussed in Thread: AWR1843

Hello,

Below is the details of testing: 

board:  AWR1843 AOP EVM

Obstacle: Mild steel (sheet 3mm thick) Cube of dimension 40x40x40cm

Lab package: Obstacle detection

We tried to use the above cube as obstacle for testing and observed that when cube is not detected at all places(FOV beyond +-30 degree).Here's the default configuration we used:-

SensorStop
flushCfg
dfeDataOutputMode 1
channelCfg 15 7 0
adcCfg 2 1
adcbufCfg -1 0 0 1 1
profileCfg 0 77 7 7 58.0 0 0 67.978 1 256 5020 0 0 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 16 0 100 1 0
lowPower 0 1
guiMonitor 1 1 0 0
cfarCfg 1 4 12 4 2 8 2 350 30 2 0 5 50 0.5
dbscanCfg 4 4 13 20 3 256
sensorStart

Hence decided to lower the CFAR threshold for improved detection. 

Then we modified config as below:

cfarCfg 1 4 12 4 2 8 2 80 30 2 0 5 50 0.5

Now We are able to detect cube at all locations but we observed few ghost points interfering with actual target cube.

We have below questions.

1.Are there any other parameters in the configurations to improve the detection suppressing ghost points.

2.What is the CFAR threshold relation between obstacle detection and OOB with an equivalent example (because in OOB its mentioned in DB and in obstacle detection its in linear).

3.How to decrease the Max-range of the radar, I tried increasing the frequency slope as per the formula but the GUI hanged.(This was to avoid any reflection we got from wall).

  • 0
    TI__Guru*** 148954 points

    Hi,

    1) The observation is expected. By lowering the  cfar threshold, peaks with lower SNR are detected. This allows to detect the object of interest but also to detect undesired peaks.

    Unfortunately this can't be improved through configuration. Usually one of the way this can be improved is by adding mouvement.

    2) Using Linear or DB depends on the implementation.

    3) In order to decrease the range you can try to

    • decrease the sampling frequency 5020
    • increase the slope 67.978 ( you would also need to decrease the ramEndTime to stay within the bandwidth 4Ghz)
    • both

    Thank you

    Cesar