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S/N in highly reflective environment


(Bart Arts) #1

I just received my Waterlinked Underwater GPS, which I intend to use as a static positioning system mainly in tanks. I saw the performance in accuracy of this system in tanks, and was amazed so I bought one.

I have a 2,5m diameter round metal tank, in which I’m testing the system. I placed the 4 receivers at maximum distance to eachother. It’s very similar to this yt video: https://www.youtube.com/watch?time_continue=26&v=doYs5kI83jc . Difference is I’m using the D1 locator, because I don’t want to integrate it into the ROV. The problem for me is the accuracy: In my setup the position jumps around about 4 meters (that’s too big in a 2,5 m diameter tank!). In the diagnostics screen I see high noise base (135 to 150), so the signal has trouble peaking above this.

I realize my setup is pushing the limits on this kind of acoustic positioning, but this is exactly what is advertised Waterlinked can handle well. I tried changing the carrier frequency to no avail. I think the problem is the tank material may be highly reflective, but I was hoping I didn’t have to insulate the entire tank wall (it’s about 5m deep). Is there something else I can try to optimize S/N ?
I will be posting this question on the Waterlinked forum as well.


(Johannes Haukelidsæter) #2

Hi Bart

Interesting challenge. We will work with you to solve the problem.

We have contacted you on e-mail for further follow up.

Best regards
Johannes / Water Linked