<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-size: 13px;color: rgb(0, 0, 0);font-family: arial, sans-serif;">Hi Alan,<div><br></div><div>sounds promising! If the UBL approach works, and becomes a product or DIY buildable thing,</div><div>you'll be able to send the sub accurate position information.</div><div><br></div><div>Cheers,</div><div> Ian.<br><br><blockquote style="padding-left: 5px; margin-left: 0px; border-left: #0000ff 2px solid; font-weight: normal; font-style: normal; text-decoration: none; font-size: 10pt; font-family: arial,sans-serif; color: black;">-----Original Message-----
<br>From: Alan via Personal_Submersibles <personal_submersibles@psubs.org>
<br>Sent: Nov 8, 2020 1:51 PM
<br>To: Personal Submersibles General Discussion <personal_submersibles@psubs.org>
<br>Subject: Re: [PSUBS-MAILIST] Underwater GPS using Underwater Backscatter Localization
<br><br><meta http-equiv="content-type" content="text/html; charset=utf-8"><div></div><div>Hi Ian,</div><div>I have something in infancy that involves surface data transducers sending down GPS</div><div>positions that are fed in to a standard sonar display that has maps on it. The kind that </div><div>has a boat icon that moves & displays your path on the map.</div><div>Alan</div><div><br>On 9/11/2020, at 10:42 AM, irox via Personal_Submersibles <<a target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div style="font-size: 13px;color: rgb(0, 0, 0);font-family: arial, sans-serif;"><style type="text/css"><!-- DIV {margin:0px;} --></style><div style="font-size: 13px;color: rgb(0, 0, 0);font-family: arial, sans-serif;">Hi Alan, <div><br></div><div>yeah that's probably one of the best option for open source sonar. I'm hoping that I can install the</div><div>Blue Robotics 360 scanner on Gamma at some point, then feed that into some SLAM (Simultaneous</div><div>Localization And Mapping) type program/module(s) to generate a map and locate the sub in the map.</div><div>It doesn't help with the absolute/global position, but may be useful for in-situ use and after the</div><div>fact analysis.</div><div><br></div><div>Cheers,</div><div> Ian.</div><div><br></div><div><br><blockquote style="padding-left: 5px; margin-left: 0px; border-left: #0000ff 2px solid; font-weight: normal; font-style: normal; text-decoration: none; font-size: 10pt; font-family: arial,sans-serif; color: black;">-----Original Message-----
<br>From: Alan via Personal_Submersibles <personal_submersibles@psubs.org>
<br>Sent: Nov 8, 2020 12:19 PM
<br>To: Personal Submersibles General Discussion <personal_submersibles@psubs.org>
<br>Subject: Re: [PSUBS-MAILIST] Underwater GPS using Underwater Backscatter Localization
<br><br><meta http-equiv="content-type" content="text/html; charset=utf-8"><div></div><div>Thanks Ian,</div><div>there is this Blue Robotics Sonar imaging scanner that has open source software.</div><div><a target="_blank" href="https://bluerobotics.com/store/sensors-sonars-cameras/sonar/ping360-sonar-r1-rp/">https://bluerobotics.com/store/sensors-sonars-cameras/sonar/ping360-sonar-r1-rp/</a></div><div>Alan</div><div><br>On 9/11/2020, at 8:36 AM, irox via Personal_Submersibles <<a target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div style=""><div style="color: rgb(0, 0, 0); font-family: arial, sans-serif; font-size: 13px;"><br></div><span style="font-size: 13px;">MIT has published a paper on underwater positioning using Underwater Backscatter Localization which</span><div><span style="font-size: 13px;">might be of interest to some folks on the list.</span></div><div><span style="font-size: 13px;"><br></span></div><div><span style="font-size: 13px;">Although it seems more focused on positioning of un-powered or under-powered objects (fish, drones, etc</span><div><div style="color: rgb(0, 0, 0); font-family: arial, sans-serif; font-size: 13px;">- surface vessel knowing the position of an underwater object), and it's only a proof-of-concept</div><div style="color: rgb(0, 0, 0); font-family: arial, sans-serif; font-size: 13px;"> (the paper on covers 1D positioning, we'd really need 3D), it does offer some hope for a relatively cheap</div><div style="color: rgb(0, 0, 0); font-family: arial, sans-serif; font-size: 13px;">underwater positioning system in the future.</div><div style="color: rgb(0, 0, 0); font-family: arial, sans-serif; font-size: 13px;"><br></div><div style="color: rgb(0, 0, 0); font-family: arial, sans-serif; font-size: 13px;">The paper can be found here:</div><div style="color: rgb(0, 0, 0); font-family: arial, sans-serif; font-size: 13px;"><a target="_blank" href="http://www.mit.edu/~fadel/papers/UBL-paper.pdf">http://www.mit.edu/~fadel/papers/UBL-paper.pdf</a></div><div style="color: rgb(0, 0, 0); font-family: arial, sans-serif; font-size: 13px;"><br></div><div style="color: rgb(0, 0, 0); font-family: arial, sans-serif; font-size: 13px;">There is a kind of layman's summary here:</div><div style=""><span style="font-size: 13px;"><a target="_blank" href="https://hackaday.com/2020/11/08/under-the-sea-gps-uses-sound/">https://hackaday.com/2020/11/08/under-the-sea-gps-uses-sound/</a></span></div></div></div><div style=""><span style="font-size: 13px;"><br></span></div><div style=""><span style="font-size: 13px;">Pity there isn't a a cheap sonar "hackers" kits (although some have do things with PC sound cards).</span></div><div style=""><span style="font-size: 13px;">On the radio side of things I can take a USB SDR (Software Defined Radio) and build a radio telescope</span></div><div style=""><span style="font-size: 13px;">for well under $100 (actually, I think it was under $50 in the end), would be great to be able to have</span></div><div style=""><span style="font-size: 13px;">that flexibility for playing with sonar.</span></div><div style=""><span style="font-size: 13px;"><br></span></div><div style=""><span style="font-size: 13px;">Cheers,</span></div><div style=""><span style="font-size: 13px;"> Ian.</span></div><div style=""><span style="font-size: 13px;"><br></span></div></div>
</div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>Personal_Submersibles mailing list</span><br><span><a target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br><span><a target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></div></blockquote></personal_submersibles@psubs.org></personal_submersibles@psubs.org></blockquote></div></div></div>
</div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>Personal_Submersibles mailing list</span><br><span><a target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br><span><a target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></div></blockquote></personal_submersibles@psubs.org></personal_submersibles@psubs.org></blockquote></div></div></body></html>