Noob question on sonar contacts

[Bellman]

A ''Noob question'' - really ?

[desertisland]

Originally Posted by Bellman

A ''Noob question'' - really ?

Really

I'm the bookish type that talk the talk but don't walk the walk.

[desertisland]

This is useless in game, just fun to know:

cos A=b/b'

b=(distance between receptors) / (speed of sound in water)
time for sound to travel between receptors while doing so along the array
a constant

b'=time lag between the receptors' detection of sound
what the towed array is designed to find out

A=angle of contact from the string of receptors
with this we get a pair of possible bearings

In practice:

arccos b/b'=A

What to do with A is determined by the sequence in which the receptors receive the sound signal.

If the front receptors receive the sound signal first:
contact bearing = (0 + A) or (360 - A)

If the end receptors receive the sound signal first:
contact bearing = (180 + A) or (180 - A)

[Travis Reed]

I would think that having two TAs out simultaneously could lead to uhm...interesting entanglements...thus, it' not done IRL (at least, no one talks about it being done IRL...)

[desertisland]

Originally Posted by Travis Reed

I would think that having two TAs out simultaneously could lead to uhm...interesting entanglements...thus, it' not done IRL (at least, no one talks about it being done IRL...)

I'm impressed my TA was never spun into a complex knot with my radio wire. Must be the extra special lubricant they applied to the cables...

[sonar732]

Originally Posted by desertisland

I'm impressed my TA was never spun into a complex knot with my radio wire. Must be the extra special lubricant they applied to the cables...

:rotfl::rotfl::rotfl::rotfl::rotfl::rotfl:

[Gorshkov]

One basic question about sonar detection ranges in DW: At what distances can each DW submarine detect others under ideal sea conditions using TA, hull and cylindrical sonars???

Maybe some links to appropriate data would be the quickest answer?

[goldorak]

It depends on the environment (SSP data), time of the year, wether you're playing in littoral waters or in the deep ocean.
It depends also againt whom you're playing, Kilo subs are deadly quiet and can come very close, something under 5nm without being detected.
Nuclear subs are more noisy so are more easily detected.
If you have convergence zones, you might detect a contact out to 30 nm.

The point is this : low frequency waves travel the furthest, the medium frequency not as much and last high frequency waves.
So your primary means of detection is to use the towed array which is tuned to detect low frequency noises.

[SeaQueen]

It depends on the combination of many factors including including the target and receiver depth, bottom type, the geography of the bottom (seamounts, for example, often block convergence zone propagation) and sound speed profile. The mission editor will draw sensor range rings. I use those frequently both in designing missions and as a tactical decision aid.

Originally Posted by Gorshkov

One basic question about sonar detection ranges in DW: At what distances can each DW submarine detect others under ideal sea conditions using TA, hull and cylindrical sonars???

Maybe some links to appropriate data would be the quickest answer?