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-   -   Hydrophone Distance Estimation (https://www.subsim.com/radioroom/showthread.php?t=242705)

VonHoffman 11-30-19 06:57 PM

A method I use to center a contact is to look for where the "ends" of the sound are (where it fades out completely and I can no longer hear it). The contact is in the center.

When dealing with a convoy at distance, I use this method to discover which way the convoy is moving before I move to intercept. I head for the quiet end of the sound in the forward direction of the convoy, as it will take me some time to get there, putting me ahead of the convoy where I can wait...

The "width" of the sound tells me if they are getting closer or moving away. The wider the spread, the closer the convoy/ship.

I like the idea of using the training mode for learning the ranging with the hydrophone! I will give this a try later!

Captain Adonis 05-03-23 10:16 PM

so I watched a youtube video and the guy said take your gain level, and that is a guess, times 5 minus 8.5 and that is your range. Example gain is 2.2
2.2*5-8.5=2.5 then times 1000 for a range of 2500 meters
I have not tested this fully

https://youtu.be/kwRaZ3RmQb0

Pisces 05-05-23 05:00 AM

There will be changes how the hydrophone station and it's gain works in the newer versions (not yet released) So I would not count too much on learning that rule of thumb.

Besides, that range doesn't tell you much. You know where it is, so just head there until you see something of it. The convoy is large enough so you won't miss it. Then consider how best to maneuvre to get visual data. Turn away to not get closer initially 'as you get your bearings' on what to do. You want to focus on speed and angle on bow (or something giving their course away). Range doesn't help you much when the torpedoes will leave your tubes and head straight away. It only helps in telling you when the impact is likely to occur. That is, if speed and AOB was correct to begin with. Otherwise it is a likely miss. Range is just a minor input to a correction for when the torpedo makes a turn towards the target.It is also a value for the torpedo salvo spread calculation if you decide to use that.

Kralizec 07-14-23 02:25 AM

When you are on the right bearing, the sound disappears at exactly 5000m for each gain step. Gain 1: 5000m, Gain 2: 10000m and so on.

I use this to measure the distance. In most cases it works better than trying to use overdrive when ranging the closest ship.

From this gain setting, you can turn it up 1.5-1.7 gain steps before the sound starts clipping. This is more subjective so less accurate. Onset of clipping is different depending on the type of ship so you won't get the best result, but on the other hand, you can get an accurate bearing at the same time.

So a ship at 5000m distance:
- sound will disappear at 1 gain
- sound will go into overdrive at around 2.5 - 2.7 gain

You can turn it around:
- the sound disappeared at 0.4 gain
- distorts at 1.9 - 2.1
Distance is 2000m

Kralizec 07-23-23 10:36 AM

Quote:

Originally Posted by Aktungbby (Post 2876990)
kamini982:Kaleun_Salute:

Do you think it would be possible to reduce the number these types of comments? It takes up so much space and contributes nothing, while reducing the signal to noise ratio of every single thread on subsim

Aktungbby 07-23-23 06:03 PM

Ahoy kamini982!
 
Quote:

Originally Posted by kamini982 (Post 2876981)
yes sir you are right.......:salute:

No doubt thru trial and error:arrgh!:

karamaujlay 12-23-23 07:20 AM

The Discord Channel is a little messy in terms of finding information in my opinion. I rejoined it, read thourgh some stuff but hard to find anything. There is just too much going on.

Aktungbby 12-23-23 02:23 PM

welcome aboard!
 
Quote:

Originally Posted by karamaujlay (Post 2896598)
The Discord Channel is a little messy in terms of finding information in my opinion. I rejoined it, read thourgh some stuff but hard to find anything. There is just too much going on.

karamaujlay!:Kaleun_Salute:


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