[FIXED] MAD detection of subs (Full Version)

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dvresic -> [FIXED] MAD detection of subs (10/19/2016 4:34:22 AM)

I've been using the Scenario Editor to check on MAD detection.
P3 Orion can detect subs down to their deepest depth>700feet.
This must be broken.
MAD detection is inversely reduced by distance squared. There's no way it would be able to pickup a sub at this depth.




Raptorx7_slith -> RE: MAD detection of subs (10/19/2016 4:56:22 AM)

What altitude is the P-3 at?




Dimitris -> RE: MAD detection of subs (10/19/2016 5:36:37 AM)

Can you post a link to a save file? Thanks!




dvresic -> RE: MAD detection of subs (10/19/2016 7:43:33 AM)

I uploaded the scen file.
I've tested this in multiple Northern Inferno scenarios though.
Aircraft are at 1000ft. with MAD




dvresic -> RE: MAD detection of subs (10/22/2016 4:16:02 AM)

This is the moment of detection where the P3 Orion detects with the MAD the 1100 foot deep sub.
How is this possible?

[image]local://upfiles/53253/B2A6BA0E84404F2DB8445B8850C29E9E.jpg[/image]




thewood1 -> RE: MAD detection of subs (10/22/2016 4:26:11 AM)

I remember reading a study that under good conditions, a MAD system could detect down to 1500 ft. I'll see I can find the pdf in my files.




michaelm75au -> RE: MAD detection of subs (10/22/2016 4:29:34 AM)

The function, then, of airborne MAD equipment is to detect the submarine-caused anomaly in the earth's magnetic field. The depth at which a submarine can be detected is a function both of the size of the submarine and how close the sensor is flown to the surface of the water.

Source: http://defence.pk/threads/so-you-want-to-detect-a-submarine.362636/#ixzz4NmU0yiJk

Another older article which shows some numbers (page 3 shows a table)
http://www.dtic.mil/dtic/tr/fulltext/u2/a081329.pdf




thewood1 -> RE: MAD detection of subs (10/22/2016 4:39:28 AM)

That last link is the one I remember.




thewood1 -> RE: MAD detection of subs (10/22/2016 4:42:40 AM)


quote:

ORIGINAL: dvresic

I've been using the Scenario Editor to check on MAD detection.
P3 Orion can detect subs down to their deepest depth>700feet.
This must be broken.
MAD detection is inversely reduced by distance squared. There's no way it would be able to pickup a sub at this depth.


Can I ask where your knowledge comes from? You seem pretty sure in your initial post. Five minutes with google showed me those parameters are at least within the realm of possibility.

I mean, you didn't come in asking how the MAD model works. You actually declared it broken. So I think you can at least show what sources you had to say its broken.




dvresic -> RE: MAD detection of subs (10/22/2016 8:12:54 PM)


I'd like to hear some input from the Developers on their MAD model. Short of that are there any submariners that can shed some light on this?
Yes surface conditions, speed of the detecting platform, alignment of the submarine to the magnetic field lines, composition and size of the submarine....but the depth I would assume would be the single most important factor in detection.
Does the game model all this? What factors influence MAD in game and to what extent?


Here's a quote from Wikipedia;


quote:

Operation
To reduce interference from electrical equipment or metal in the fuselage of the aircraft, the MAD sensor is placed at the end of a boom or on a towed aerodynamic device. Even so, the submarine must be very near the aircraft's position and close to the sea surface for detection of the anomaly, according to the Inverse Square Law (or Law of Inverse Squares). The size of the submarine, its hull composition and orientation determine the detection range. MAD devices are usually mounted on aircraft.
quote:





thewood1 -> RE: MAD detection of subs (10/22/2016 8:35:04 PM)

My question is you said its broken...what's broken? Can you at least answer that instead of throwing wiki links around?




apache85 -> RE: MAD detection of subs (10/22/2016 10:04:43 PM)

I ran some tests on this a while back. Using a helix to detect a LA class sub altitude and depth had a significant impact.

At a (helo) altitude of 1000ft a sub at -100ft was detected at 564m. At a depth of -500ft the sub was detected at 442m, and at -1000ft the sub was detected at 290m. This was consistent and repeatable.

Not sure if it's correct or not, but the model does seem to take depth into account.




Dimitris -> RE: MAD detection of subs (10/23/2016 8:22:05 AM)

Tried this now.

The maximum detection range of the CA/ASQ-508(V) MAD sensor is 1nm.

The detection check happens as the CP-140 is at 1000ft and the submarine is at 1312ft. The slant range between them is 0.60nm, well within the MAD sensor's range, so the detection happens.

Which, if any, of the above elements is unreasonable ?




dvresic -> RE: MAD detection of subs (10/24/2016 7:04:19 AM)

If this was realistic, that a P3 would get a MAD contact at a sub at any depth, well I don't think the Navies of the world would be spending as much time and money in ASW as they are.

In the game; a 30x30mile patrol box of a P3 with a loiter time of 3hours would detect a sub every single time. No matter what depth or speed. Simply by flying over it with MAD. The sub could be 1400 feet deep.

Therefore I think the model is broken.

Scenario after scenario. Subs sunk due to a MAD hit.

I've posted a scenario...2 US SSN's (LA and Virginia class )are trying to Break out/Break in thru the San Juan Straight. It's not Sonar that picks them up. In every case it's a P3 flying patrol overhead with MAD.




Dimitris -> RE: MAD detection of subs (10/24/2016 8:32:31 AM)

This doesn't answer the question. Which of the above steps that I listed is unreasonable?

Do you have any sources that MAD is unable to detect aircraft at large depth ?

Thanks.




Sardaukar -> RE: MAD detection of subs (10/24/2016 10:19:50 AM)

This was in 1945...so in my opinion, current detection ranges and depths are totally reasonable:

https://books.google.fi/books?id=nyYSERH9wrgC&pg=PA256&lpg=PA256&dq=can+mad+detect+submarine+in+deep&source=bl&ots=PWn8u7oThw&sig=h-bXoY1_7yKTr3KVT7V3Wxu4LD4&hl=en&sa=X&ved=0ahUKEwj3656fjPPPAhXD_iwKHchUA6o4ChDoAQguMAM#v=onepage&q=can%20mad%20detect%20submarine%20in%20deep&f=false

It says that Japanese MAD could detect submarine 900 feet range. Patrol altitude 200 ft would allow detection to 700 ft.

As Sunburn said, modern MAD has detection range of 1 nm. So detections even deep are totally feasible.





Zaslon -> RE: MAD detection of subs (10/24/2016 10:42:30 AM)


quote:

ORIGINAL: Sunburn

Tried this now.

The maximum detection range of the CA/ASQ-508(V) MAD sensor is 1nm.

The detection check happens as the CP-140 is at 1000ft and the submarine is at 1312ft. The slant range between them is 0.60nm, well within the MAD sensor's range, so the detection happens.

Which, if any, of the above elements is unreasonable ?

That's all the input required for a MAD detection? range?




Dimitris -> RE: MAD detection of subs (10/24/2016 1:08:19 PM)

Slant range, plus modifiers for non-metallic construction. If you look at the DB there are no per-platform magnetic signatures.




wild_Willie2 -> RE: MAD detection of subs (10/24/2016 3:40:11 PM)

During normal ASW operations operations there would also be numerous false contacts in any shallow patrol area due to wrecks, debris or magnetic minerals.

Maybe it would be a good idea to introduce false MAD contacts like "wrecks" or "iron garbage" in lieu of false sonar contracts. I don't think these would be hard to program into the game, it would just be a matter of creating a neutral underwater unit with zero speed and a high magnetic field.

W.





mikmykWS -> RE: MAD detection of subs (10/24/2016 3:50:12 PM)

Hi Guys

There are some planned sonar and sub mechanics improvements planed for the future but for moment the sub model is sufficient for what most people seem to want to do. If you'd like something added please put it in the request strings so we can get a sense of priority.

Thanks!

Mike




mikmykWS -> RE: MAD detection of subs (10/24/2016 3:51:19 PM)


quote:

ORIGINAL: Zaslon


quote:

ORIGINAL: Sunburn

Tried this now.

The maximum detection range of the CA/ASQ-508(V) MAD sensor is 1nm.

The detection check happens as the CP-140 is at 1000ft and the submarine is at 1312ft. The slant range between them is 0.60nm, well within the MAD sensor's range, so the detection happens.

Which, if any, of the above elements is unreasonable ?

That's all the input required for a MAD detection? range?


What are we missing?

Thanks!

Mike




mikmykWS -> RE: MAD detection of subs (10/24/2016 3:54:08 PM)

quote:

ORIGINAL: dvresic

If this was realistic, that a P3 would get a MAD contact at a sub at any depth, well I don't think the Navies of the world would be spending as much time and money in ASW as they are.

In the game; a 30x30mile patrol box of a P3 with a loiter time of 3hours would detect a sub every single time. No matter what depth or speed. Simply by flying over it with MAD. The sub could be 1400 feet deep.

Therefore I think the model is broken.

Scenario after scenario. Subs sunk due to a MAD hit.

I've posted a scenario...2 US SSN's (LA and Virginia class )are trying to Break out/Break in thru the San Juan Straight. It's not Sonar that picks them up. In every case it's a P3 flying patrol overhead with MAD.


Real navies are looking at our sim and haven't complained about how we're doing this yet.

What is your point of expertise exactly? If its sub command, 688I or Dangerous Waters the scopes of the games are different. We don't model every button push or fish fart but make the assumption that the crew etc. handle these functions leaving the player to worry abut higher level things.

Thanks!

Mike




stilesw -> RE: MAD detection of subs (10/24/2016 4:11:48 PM)

ROTFL! Sorry, couldn't resist.

-WS

[image]local://upfiles/49187/3FC6EC2764114991B278FF20A2236254.jpg[/image]




Gunner98 -> RE: MAD detection of subs (10/24/2016 5:02:25 PM)

quote:

or fish fart


[sm=00000280.gif]is that really a thing? [sm=happy0065.gif]




Schr75 -> RE: MAD detection of subs (10/24/2016 5:39:41 PM)


quote:

ORIGINAL: Gunner98

quote:

or fish fart


[sm=00000280.gif]is that really a thing? [sm=happy0065.gif]


It sure is [:D]
https://www.youtube.com/watch?v=OcwCYIfm6eA




Zaslon -> RE: MAD detection of subs (10/24/2016 6:04:43 PM)

Thanks Sunburn for the answer.

quote:

ORIGINAL: mikmyk


quote:

ORIGINAL: Zaslon


quote:

ORIGINAL: Sunburn

Tried this now.

The maximum detection range of the CA/ASQ-508(V) MAD sensor is 1nm.

The detection check happens as the CP-140 is at 1000ft and the submarine is at 1312ft. The slant range between them is 0.60nm, well within the MAD sensor's range, so the detection happens.

Which, if any, of the above elements is unreasonable ?

That's all the input required for a MAD detection? range?


What are we missing?

Thanks!

Mike

You can add Distance to the seabed. MAD doesn't work well in coastal waters because the magnetometer dont measure absolute parameters. THe magnetometer measure differences...contrast...then in coastal waters, MAD detect a lot of natural anomalies of the seabed (and also can detect sunken ships). When the seabed hasn't natural anomalies....It still can mask the magnetic signature of the submarine, his signature can be decreased over his signature in deep waters because we are measuring differences, not an absolute parameter as I said so the magnetic signature of the seabed is greater than the magnetic signature of the sea water.

A friend of mine told me that they do not use MAD in areas with depth less than 1,000 meters (3,330 ft).

P.S. that is very simplistic but can work here. Heading of submarine and Aircraft, speeds...also take account in real life.




mikmykWS -> RE: MAD detection of subs (10/24/2016 6:08:45 PM)

Seems reasonable. Do you have a source with reliable data handy?

Obviously when asked by a pro why we did this we can't say Zaslon's friend told us to[:)]

Mike




thewood1 -> RE: MAD detection of subs (10/24/2016 6:34:36 PM)

Actually, that's a little too generic also. The US Navy used to spend time and money surveying and mapping the behavior of magnetic fields. This is specifically so magnetic-type sensing could be used. Because it is all relative and having a baseline is very important. There are still huge sections of the ocean that haven't been mapped and fields can shift. They tended to map common routes for subs. But it does require constant updating.

I have always suspected that is why MAD fell out of favor. Don't have any data, but my uncle served on a survey ship. It's primary mission in the 1970's was ocean floor mapping, but its secondary mission was field mapping.




Zaslon -> RE: MAD detection of subs (10/24/2016 7:30:42 PM)

Mike, a MAD its a magnetometer used in Aeromagnetic campaigns. What I wrote can be found in any basic manual about geophysics. But areful because sometimes basic concepts were explained in gravimetry (both methods have similarities).

My buddy only told me the threshold (a rule-of-thumb) betweetn coastal waters and deep waters for MAD detection. If you take the idea, surely Paul or any ASW guy can define a good threshold.




mikmykWS -> RE: MAD detection of subs (10/24/2016 7:57:45 PM)


quote:

ORIGINAL: Zaslon

Mike, a MAD its a magnetometer used in Aeromagnetic campaigns. What I wrote can be found in any basic manual about geophysics. But areful because sometimes basic concepts were explained in gravimetry (both methods have similarities).

My buddy only told me the threshold (a rule-of-thumb) betweetn coastal waters and deep waters for MAD detection. If you take the idea, surely Paul or any ASW guy can define a good threshold.


Will do. Thanks

Mike




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