<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div></div><div>Cliff,</div><div>great project for your students!</div><div>Unfortunately I will have to make my sub first as there would need</div><div>to be a lot of fine tuning in the field.</div><div>Alan</div><div><br></div><div><br>On 5/09/2019, at 2:14 PM, Cliff Redus via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div class="ydpe8d0095cyahoo-style-wrap" style="font-family: times new roman, new york, times, serif; font-size: 16px;"><div></div>
<div dir="ltr" data-setdir="false">Sounds like another project for you Alan. For me, I am hoping to find something off the shelf if possible and does not cost an arm and a leg.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Cliff</div><div><br></div>
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On Wednesday, September 4, 2019, 02:58:08 PM CDT, Alan via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:
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<div><div id="ydp6ae9672eyiv3286758150"><div><div></div><div>Cliff,</div><div>I have been looking at boat transducers & there are some reasonably priced</div><div>units available. The group did a lot of work on home made passive sonar with</div><div>Piezoelectric transducers. These are very cheap. </div><div>Perhaps make up a circular array of narrow beam passive sonars, with a central</div><div>transducer pointing down & the outer ring of transducers angled out slightly.</div><div>Have one wider angled transducer for transmitting data. </div><div>Hang the array to a small floating platform that has two small electric motors</div><div>on it for tractor steering ( think radio control boat size) & a GPS receiver.</div><div>The submarine transmits from one or two transducers with a narrow beam.</div><div>The surface unit will be able to follow above the sub based on which of its </div><div>transducers is receiving the strongest signal. It will always attempt to have its </div><div>central transducer receiving the strongest signal.</div><div>It will periodically send it's GPS signal to the sub which passes this signal in to </div><div>an off the shelf boat chart plotter.</div><div>The sub can send its heading & speed information to the sonar array to help</div><div>It keep on track.</div><div>My idea may sound a bit fantastic but there are kids toys more complicated.</div><div>I bought a NZ $200 drone with a video camera, return to take off & follow me </div><div>functions. Also Minn kotta have a thruster that is radio controlled & has a GPS</div><div>hold position function.</div><div>Have a few more thoughts but will stop here.</div><div>Alan</div><div><br clear="none"></div><div><br clear="none"></div><div><br clear="none"></div><div><br clear="none"></div><div><br clear="none"></div><div><br clear="none"></div><div class="ydp6ae9672eyiv3286758150yqt5994749757" id="ydp6ae9672eyiv3286758150yqt13053"><div><br clear="none">On 5/09/2019, at 1:21 AM, Cliff Redus via Personal_Submersibles <<a shape="rect" href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><br clear="none"></div><blockquote type="cite"><div></div></blockquote></div></div><div class="ydp6ae9672eyiv3286758150yqt5994749757" id="ydp6ae9672eyiv3286758150yqt43390"><div>We need a PSub wis kid to make a DIY version of this kit.<div><br clear="none"></div><div>Cliff <br clear="none"><div><br clear="none"><div dir="ltr" id="ydp6ae9672eyiv3286758150AppleMailSignature">Sent from my iPhone</div><div dir="ltr"><br clear="none">On Sep 4, 2019, at 12:12 AM, Alan via Personal_Submersibles <<a shape="rect" href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><br clear="none"></div><blockquote type="cite"><div dir="ltr"></div></blockquote></div></div></div></div><div><div class="ydp6ae9672eyiv3286758150yqt5994749757" id="ydp6ae9672eyiv3286758150yqt81303"><div></div><div>Cliff,</div><div>Just got a price on the Subsonus you referenced. Part of the reply is below...</div><div><div><span> "A kit for the vessel (item code: <span class="ydp6ae9672eyiv3286758150prokeys-snippet-text">SUBSONUS-SURFACE-KIT), includes the <span class="ydp6ae9672eyiv3286758150prokeys-snippet-text">Subsonus USBL, pole mounting bracket, a <span class="ydp6ae9672eyiv3286758150prokeys-snippet-text">GNSS Compass, <span class="ydp6ae9672eyiv3286758150prokeys-snippet-text">PoE-Injectors and cables.</span></span></span></span></span></div><div><span>Provide a boat, a pole, power and a network and you'll have yourself a tracking solution that you could mobilise immediately.</span></div><div><span>This surface kit is US$22,800."</span></div></div><div><span>Alan</span></div><div><span><br clear="none"></span></div><div><span><br clear="none"></span></div><div><br clear="none"></div><div><br clear="none">On 1/09/2019, at 1:29 AM, Cliff Redus via Personal_Submersibles <<a shape="rect" href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><br clear="none"></div><blockquote type="cite"><div><div class="ydp6ae9672eyiv3286758150ydp2e3398a7yahoo-style-wrap" style="font-family:times new roman, new york, times, serif;font-size:16px;"><div></div>
<div dir="ltr">Alan, an alternative would be to order an off-the-shelf USBL <span><a shape="rect" href="https://en.wikipedia.org/wiki/Short_baseline_acoustic_positioning_system" rel="nofollow" target="_blank">https://en.wikipedia.org/wiki/Short_baseline_acoustic_positioning_system</a> </span>system like <span><a shape="rect" class="ydp6ae9672eyiv3286758150enhancr_card_7801585810" href="https://www.advancednavigation.com/product/subsonus" rel="nofollow" target="_blank">Subsonus | Advanced Navigation</a></span><div><br clear="none"></div></div><div dir="ltr"><br clear="none"></div><div dir="ltr"><br clear="none"></div><div><br clear="none"></div>
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On Saturday, August 31, 2019, 05:54:47 AM CDT, Alan via Personal_Submersibles <<a shape="rect" href="mailto:personal_submersibles@psubs.org" rel="nofollow" target="_blank">personal_submersibles@psubs.org</a>> wrote:
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<div><div dir="ltr">I was looking at GPS receivers for my sub, mainly for estimating my<br clear="none"></div><div dir="ltr">surface speed & determining my range based on my power consumption.<br clear="none"></div><div dir="ltr">But it occurred to me that you could make a similar system to GPS for<br clear="none"></div><div dir="ltr">underwater navigation.<br clear="none"></div><div dir="ltr">Have 4 buoys placed around your intended dive location that have GPS<br clear="none"></div><div dir="ltr">receivers & ultrasonic transmitters. With a bit of electronics the submarine <br clear="none"></div><div dir="ltr">could locate itself with trilateration ( as in GPS) in relation to the 4 bouys.<br clear="none"></div><div dir="ltr">The 4 buoys in turn are locating their position off satellites & relaying this<br clear="none"></div><div dir="ltr">information via the ultrasonic transmitters to the sub. This way the pilot<br clear="none"></div><div dir="ltr">could use charts to plot where they were & where they had been. <br clear="none"></div><div dir="ltr">It wouldn't matter too much if the buoys were blown about or if they moved <br clear="none"></div><div dir="ltr">in the current as they would update their position.<br clear="none"></div><div dir="ltr">It may be helpful for grid searching.<br clear="none"></div><div dir="ltr">If you wanted to get more serious you could put small motors on the buoys<br clear="none"></div><div dir="ltr">that automatically held them in position as Minnkota are now doing with<br clear="none"></div><div dir="ltr">their radio controlled motor.<br clear="none"></div><div dir="ltr">Or is this already done?<br clear="none"></div><div dir="ltr">Alan<br clear="none"></div><div dir="ltr"><br clear="none"></div><div dir="ltr">You bolt this unit to the top of your sub and drop the corresponding tender transponder into the water and the sub (as well as the tender) knows its submerged GPS location real time. Tender knows it's GPS location and the surface unit calculates the relative location of the sub then sends the calculated GPS location back to the sub real time. There are a number of these USBL systems. For the Psub community, the trick would be to standardize on one that does not cost an arm and a leg.<br clear="none"></div><div dir="ltr"><br clear="none"></div><div dir="ltr">Cliff</div><div dir="ltr"><br clear="none"></div><div dir="ltr"><br clear="none"></div><div dir="ltr">_______________________________________________<br clear="none"></div><div dir="ltr">Personal_Submersibles mailing list<br clear="none"></div><div dir="ltr"><a shape="rect" href="mailto:Personal_Submersibles@psubs.org" rel="nofollow" target="_blank">Personal_Submersibles@psubs.org</a><br clear="none"></div><div dir="ltr"><a shape="rect" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" rel="nofollow" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div></div>
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