Passive sonar and conversion zone detection

Matrix Games Forums

Forums Register Login Photo Gallery Member List Search Calendars FAQ

My Profile Inbox Address Book My Subscription My Forums Log Out

Passive sonar and conversion zone detection

View related threads: (in this forum | in all forums)

Logged in as: Guest

Users viewing this topic: none

Printable Version

All Forums >> [New Releases from Matrix Games] >> Command: Modern Operations series >> Passive sonar and conversion zone detection

Page: [1]

Message

<< Older Topic Newer Topic >>

Passive sonar and conversion zone detection - 2/22/2018 2:48:06 AM

charlee22009

Posts: 72
Joined: 6/28/2015
Status: offline

Question. Can you guys/girls help me understand or guess the Sound Velocity Profile (SVP) in the screenshot?

How does, in this specific case, the surface temperature, season, and sea state effect the sound propagation?

Why is the convergence zone relatively stronger in this case?
My understanding is that the SVP is negative when the surface water temperature is hotter (it's 20degrees C) - not to mention it's August.

Doesn't this create a 'negative' SVP near the surface and in the 'seasonal' layer as well? (Negative in the seasonal due to the relatively warm surface temperatures, and colder temperatures as you get deeper?)

If the water 'layers' in this example were
------Surface Slightly negative
------Seasonal Moderately/strongly negative
------Main (permanent) thermocline (even more??) negative...

Then the 'layer' according to CMANO is the slope or change in sound velocity... between the 'surface/seasonal' and the main thermocline?
And if they are all negative, why does that make the layer 'stronger?' .62 isn't *that* strong but it's stronger than I've seen it elsewhere (say GIUK gap)?

Is that '.62' the strength of the convergence zone(s)??? Because if most or all of the rays bend downwards, pretty much above and below the 'layer'... and it's really deep is this making the convergence zones 'stronger' or more focused???

Here is the pic
Also the ORIGINAL detection by the Knox Class Frigate was with the hull passive sonar!!!!! Although she was at around 5 knots (in relatively calm sea state 3), isn't it pretty hard to detect subs with passive hull mounted?? Since it *was* hull mounted - does this actually suggest that the general SVP was negative? - Because if it were positive ABOVE the layer - wound't most of the sound get trapped in the surface duct???

Attachment (1)

Post #: 1

RE: Passive sonar and conversion zone detection - 2/22/2018 2:51:34 AM

charlee22009

Posts: 72
Joined: 6/28/2015
Status: offline

Here is the example SVP i'm referring to

Attachment (1)

(in reply to charlee22009)

Post #: 2

RE: Passive sonar and conversion zone detection - 2/22/2018 5:45:25 PM

charlee22009

Posts: 72
Joined: 6/28/2015
Status: offline

Bump? Anyone clarify or help me out with this??

(in reply to charlee22009)

Post #: 3

RE: Passive sonar and conversion zone detection - 2/22/2018 6:04:15 PM

thewood1

Posts: 6529
Joined: 11/27/2005
Status: offline

I would think you could maybe be a little patient. That might help.

(in reply to charlee22009)

Post #: 4

RE: Passive sonar and conversion zone detection - 2/22/2018 6:25:26 PM

Primarchx

Posts: 3102
Joined: 1/20/2013
Status: offline

Sounds like something the Devs should address regarding the sonar model. What depth is the sub at? What's your Knox's EMCON, is it pinging?

(in reply to thewood1)

Post #: 5

RE: Passive sonar and conversion zone detection - 2/22/2018 6:29:01 PM

charlee22009

Posts: 72
Joined: 6/28/2015
Status: offline

quote:

ORIGINAL: Primarchx

Sounds like something the Devs should address regarding the sonar model. What depth is the sub at? What's your Knox's EMCON, is it pinging?

negative. just passive. Not sure what the original depth was of the sub.

Would be great to a SVP window/BT probe indication. Wow would that be immersive. And I'm not saying the model is wrong, just looking for a little clarification on how it's implemented. I have looked at the manual, but I'm interested in how the information's applied.

(in reply to Primarchx)

Post #: 6