[PSUBS-MAILIST] 3D dive recording, kickstarter

[J. Foulkes via Personal_Submersibles]

Alan,

Yes, I deal with geolocation and tracking problems for work.  Mostly this
is on the land or in the air, but my personal interests carry into the
water.

The problem that you face is how to provide multiple reference paths to the
GPS receiver.  DSP-Comm simplifies the problem by only transmitting the
range to the base station (deck unit).  If you want a better solution you
would implement something similar to a LORAN-C network.  More simply you
could have a modem on your deck that receives in two different frequency
bands so you can perform attenuation ranging on different frequencies for
improved accuracy and then triangulate the location of you underwater asset
(the longer the baseline the better - a hydrophone off the bow and stern).
If you want you could still have a transmit hydrophone like DSP-Comm
supplies for full duplex communications that also transmits current
location to the sub.

Regards,
James


On Thu, Jan 16, 2020 at 6:25 PM Alan via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Thanks for the insight into their product James.
> One of the problems is getting the GPS signal down to the sub, &
> I have been looking at this company .....
>
> https://dspcommgen2.com/aquatrans-underwater-acoustic-dunking-hydrophone-transducer/
> for data transfer transducers & modems.
> They are reasonably inexpensive & are based in Bangkok.
> BTW you seem to know your stuff, are you involved professionally in that
> area
> or is it just an interest?
> Regards Alan
>
>
>
> On 16/01/2020, at 8:54 PM, J. Foulkes via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>   Hello everyone,
>
> OEngineering was at CES this year with this product and I had several
> lengthy discussions with them about their system.  So, first I would like
> to point out that the real focus of this system is for citizen science
> applications (inexpensive) not for extended dive precision mapping.  If
> this is your application, you would be much better served using a control
> laptop with external IMU and GNSS devices as the IMU on this product
> doesn't have the best freerunning accuracy.  Secondly, it seemed that what
> they were really pushing as the technology you are paying for is the app
> interface.  It was unclear from talking with them what interface would be
> available (API) for downloading raw data on points of interest  and
> continuous tracking outside of this interface.  Also, one thing to note is
> that if you were using this in your sub for datalogging (it requires manual
> button pressing for POI logging) you would need a GNSS repeater with a
> bulkhead pass through.
>
> Regards,
> James Foulkes
>
> On Wed, Jan 15, 2020 at 11:22 PM T Novak via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> This does look interesting, Brian.
>>
>> Worth thinking about.
>>
>> Tim
>>
>>
>>
>> *From:* Personal_Submersibles [mailto:
>> personal_submersibles-bounces at psubs.org] *On Behalf Of *Alan via
>> Personal_Submersibles
>> *Sent:* Wednesday, January 15, 2020 4:38 PM
>> *To:* Personal Submersibles General Discussion <
>> personal_submersibles at psubs.org>
>> *Subject:* Re: [PSUBS-MAILIST] 3D dive recording, kickstarter
>>
>>
>>
>> Looks useful Brian.
>>
>> Some sort of mapping is definitely useful.
>>
>> I have just been looking at GPS receivers to see how they can be water /
>> pressure
>>
>> proofed. I think a GPS system would be the bare minimum.
>>
>> If you found a treasure chest you could at least head straight to the
>> surface
>>
>> & get a GPS coordinate.
>>
>> Alan
>>
>>
>> On 16/01/2020, at 11:26 AM, Brian Hughes via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>> OK,
>>
>>
>>
>> This looks interesting:
>>
>>
>>
>>
>> https://newatlas.com/outdoors/brizo-3d-scuba-dive-maps/?fbclid=IwAR0bwSGSy8zlABzonbS9PO4M-hyca94ADtn57E7YlccucUaqQGz3WNFqYBQ
>>
>>
>>
>> Brian
>>
>>
>>
>> Get Outlook for Android <https://aka.ms/ghei36>
>>
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