iPhone in-river location concept

Who is familiar with Underwater High Accuracy Location Finding?

Here, complete with a couple new acronyms, UWSN and (terrestrial) WSN, but also many more like DETs, AUV's, etc., and more than anything else, HLS
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3304154/#b4-sensors-12-02026

jaclaz

Grazie!

Got today the information of a professional diver (outside Police) who mentioned that he had mobile broadband access 10 meters under water.

Who is expert? Water has a heterogeneity and absorbs RF signals. Is this possible?

Got today the information of a professional diver (outside Police) who mentioned that he had mobile broadband access 10 meters under water.

Who is expert? Water has a heterogeneity and absorbs RF signals. Is this possible?

Sea (salted) or river/lake?

I would say possible under fresh water, more unlikely in sea water, unless maybe in the immediate vicinity of a tower/near the shore, or anyway in exceptionally high signal spots.

I have seen other reports of phones still having signal at around 35 feet, just like with Faraday cages, very likely text/sms can "go through" much better than voice, however, mobile broadband is likely to become narrowband.

jaclaz

River

River

Then it is plausible.
I would expect (very roughly) something like 3-4, maybe 5 dB attenuation per meter of depth, so if the signal is very strong in the area a "sensible" phone might do it.

Some anecdotal evidence, JFYI
http//www.undercurrent.org/UCnow/dive_magazine/2010/CellPhoneDiving201001.html

jaclaz

Worth reading about ADCP in Hydro International

https://issuu.com/geomarespublishing/docs/hydro-international-january-februar_e7992384f33b6d/10

For the underwater location finding we partnered with DesertStar.com.

http//www.desertstar.com/page/southstar

The project runs fine and we plan the version 2 with size-reduced components -)

Just got our Endura from Aquabotix - great fun to test -)

https://f2.blick.ch/img/aktuell/origs560953/6805562603-w644-h429/Unfall-Winterthur-Mini-Toess.jpg
This was the past - the next time little green diver goes down…

For the USBL we trust on the X150

http//www.blueprintsubsea.com/pages/product.php?PN=BP00795