[PSUBS-MAILIST] Underwater Navigation

[Sean T. Stevenson via Personal_Submersibles]

Years ago I got a quote on a Teledyne Workhorse Navigator DVL (doppler velocity log) that could potentially provide a self-contained dead reckoning navigation solution that would be accurate enough for most purposes. At the time, I think they quoted me around $15k. I just became aware of a new successor to that product, called the Tasman DVL, that might actually be cheaper - I'll have to get a quote to find out. Probably still stretching a hobbyist budget though.

Sean

-------- Original Message --------
On Sep. 3, 2019, 23:12, Alan via Personal_Submersibles wrote:

> Cliff,
> Just got a price on the Subsonus you referenced. Part of the reply is below...
>    "A kit for the vessel (item code: SUBSONUS-SURFACE-KIT), includes the Subsonus USBL, pole mounting bracket, a GNSS Compass, PoE-Injectors and cables.
> Provide a boat, a pole, power and a network and you'll have yourself a tracking solution that you could mobilise immediately.
> This surface kit is US$22,800."
> Alan
>
> On 1/09/2019, at 1:29 AM, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>> Alan, an alternative would be to order an off-the-shelf USBL https://en.wikipedia.org/wiki/Short_baseline_acoustic_positioning_system system like [Subsonus | Advanced Navigation](https://www.advancednavigation.com/product/subsonus)
>>
>> On Saturday, August 31, 2019, 05:54:47 AM CDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>>
>> I was looking at GPS receivers for my sub, mainly for estimating my
>> surface speed & determining my range based on my power consumption.
>> But it occurred to me that you could make a similar system to GPS for
>> underwater navigation.
>> Have 4 buoys placed around your intended dive location that have GPS
>> receivers & ultrasonic transmitters. With a bit of electronics the submarine
>> could locate itself with trilateration ( as in GPS) in relation to the 4 bouys.
>> The 4 buoys in turn are locating their position off satellites & relaying this
>> information via the ultrasonic transmitters to the sub. This way the pilot
>> could use charts to plot where they were & where they had been.
>> It wouldn't matter too much if the buoys were blown about or if they moved
>> in the current as they would update their position.
>> It may be helpful for grid searching.
>> If you wanted to get more serious you could put small motors on the buoys
>> that automatically held them in position as Minnkota are now doing with
>> their radio controlled motor.
>> Or is this already done?
>> Alan
>>
>> 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.
>>
>> Cliff
>>
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