[PSUBS-MAILIST] Underwater GPS using Underwater Backscatter Localization

[Jon Wallace via Personal_Submersibles]

 I don't know...Blue Robotics tends to have pricey stuff.  They want $1950 for that pinger but you can get a humminbird helix 9 with mega 360 imaging for about $2000, new.  See video link for image comparison.  Funny this topic should come up now, I was thinking about suggesting this equipment as a group purchase to keep track of sub location during our events or excursions.
Jon

Humminbird Mega 360


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Humminbird Mega 360


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    On Sunday, November 8, 2020, 04:43:44 PM EST, irox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Hi Alan, 
yeah that's probably one of the best option for open source sonar.  I'm hoping that I can install theBlue Robotics 360 scanner on Gamma at some point, then feed that into some SLAM (SimultaneousLocalization And Mapping) type program/module(s) to generate a map and locate the sub in the map.It doesn't help with the absolute/global position, but may be useful for in-situ use and after thefact analysis.
Cheers,  Ian.


-----Original Message-----
From: Alan via Personal_Submersibles 
Sent: Nov 8, 2020 12:19 PM
To: Personal Submersibles General Discussion 
Subject: Re: [PSUBS-MAILIST] Underwater GPS using Underwater Backscatter Localization

Thanks Ian,there is this Blue Robotics Sonar imaging scanner that has open source software.https://bluerobotics.com/store/sensors-sonars-cameras/sonar/ping360-sonar-r1-rp/Alan
On 9/11/2020, at 8:36 AM, irox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:



MIT has published a paper on underwater positioning using Underwater Backscatter Localization whichmight be of interest to some folks on the list.
Although it seems more focused on positioning of un-powered or under-powered objects (fish, drones, etc- surface vessel knowing the position of an underwater object), and it's only a proof-of-concept (the paper on covers 1D positioning, we'd really need 3D), it does offer some hope for a relatively cheapunderwater positioning system in the future.
The paper can be found here:http://www.mit.edu/~fadel/papers/UBL-paper.pdf
There is a kind of layman's summary here:https://hackaday.com/2020/11/08/under-the-sea-gps-uses-sound/
Pity there isn't a a cheap sonar "hackers" kits (although some have do things with PC sound cards).On the radio side of things I can take a USB SDR (Software Defined Radio) and build a radio telescopefor well under $100 (actually, I think it was under $50 in the end), would be great to be able to havethat flexibility for playing with sonar.
Cheers,  Ian.


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