DWM1001 z axis accuracy improvement

[markus]

Dear all,

first of all I’d like to share my appreciation for the great Decawave products. I’ve bought an tested the MDEK1001 which has an excellent peformance for a low price.

Now my question: In my test setup (see attached picture), I achieved a really good localisation performance in the xy-plane (around 10 cm). When I place all anchors on the same height, I get ambiguities in the z axis coordinates (which obviously makes sense). As you can see in my setup, I then placed the anchors at different heights and added two more anchors which improved the z accuracy. However, at some places, the z coordinate of the tag is still more than 50 cm off and sometimes it ‘jumps’ between values. Is there any recommendation on how to arrange the anchors for a good z axis performance?

Thanks in advance for your response.

Best regards from Germany,
Markus

[Yves_Bernard_Qorvo]

Hi Markus,

Indeed it is recommended to place anchors at different height to improve Z accuracy, but it the result may still not be satisfying due to poor GDOP.

Take a look at the thread below, or look for GDOP on the forum, it’s been mentioned a good few times :

Location Accuracy of Decawave Modules

Hello gumush, The location given by gateway is in 3D and in the below format , if you use ‘lep’ command. b’POS,21.72,65.28,2.76,92\r\n’ Where x=21.72 , y=65.28, z=2.76 with a confidence rate of 92% May be but in my experience Z axis values do not make any sense when deployed.

Thanks
Yves

[markus]

Hi Yves!

Thank you for your quick and helpful response!

Markus