Tag location data inconsistent

Wireless Connectivity Ultra-Wideband
1

We are testing the kit with 5 anchors on top of a vehicle in an open parking lot. There are a few issues we’re facing:

  1. the tag is detected intermittently within ~10m. from 10-20m, it is rarely, if ever detected. Is there a way to improve the accuracy from 0-20 m?

  2. the anchors signal is inconsistent. When on the Network Details page the signal bars fluctuate often/ or disappear altogether. Is there a way to make the signal more consistent?

  3. xyz position of the tag is inconsistently logging on the Position Log tab. A sample of the data can be seen below. Is there a way to consistently see the xyz position of the tag?

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2

How are they mounted on the car?
Resting the antennas on top of a big sheet of metal is going to have a significant impact on the range and accuracy. Try raising the antennas up from the roof by at least 20 cm and then trying again.

3

Hi Andy,

We tired 2 configurations: Mounted on the inside interior “roof” of the car and on the outside (ie. metal sheet) of the car. Both resulted in a poor/inconsistent result. We’re using this kit to prototype a vehicle feature, so the sensors will have to be attached to or within the vehicle.

Is it possible to use the dev kit for our use case while maintaining range/accuracy?

Thanks, please let me know if it is easier to arrange a quick call.

4

Meighan,

The standard decawave antennas are designed for free space, if you are putting them close to metal, either inside or outside the car then you are going to lose a lot of range.
If this is for a proof of concept / prototype then try moving the antennas away from the metal and testing that. If it works then this doesn’t mean that your final product necessarily needs to be that far away from the roof, it just means that your final hardware will need to use a different antenna.

If you fix these range issues you’ll probably find you also get an accuracy improvement. However in order to get good accuracy ranges you do need to have a clear line of sight between the antennas. This could be tricky inside the car. If the line of sight is blocked then you’ll get poor range accuracy and that will result in poor position calculations and dropouts.
The position calculation method the decawave code uses isn’t particularly robust in this situation, there are better ways to calculate positions if you know you’re going to get unreliable or inaccurate ranges. But this requires you to write your own position calculation system.

I should also point out I don’t work for Decawave, I’m just someone who uses their parts. I actually work for Racelogic, you may have heard of us if you’re in the automotive industry.