Monster Factory: 1344: anomaly sound source in sonar

? The Pentagon group of experts have done the right research.

The humpback whale wanted to return to Zhongyun City, naturally, it went south along the African continent, and finally passed by the side of Madagascar Island.

However, on both sides of Madagascar Island.

Two Burke-class missiles Destroyer, four frigates, Sea Area on both sides have been lined up in battle formation at once.

Each blockade line is centered on the Burke-class missile Destroyer, two frigates are responsible for launching sonar buoys, and Burke-class releases the SQR-20 active and passive towed sonar system.

In their navy formation, there is no special anti-submarine ship.

Now the military vessel functions are modular and diversified. According to the tactical equipment carried by each military vessel, the sea, land and air networks are formed to form an unbreakable anti-submarine network.

Sky Force is two P-8 anti-submarine patrol aircraft.

However, Rasit, the commander of the joint fleet, believes that the Monster industrial submarine must have at least three to four days to travel from the seaside port of Nicaya to here.

So they merely began to arrange sonar detection device in advance, and the anti-submarine patrol plane would arrive here to start patrols only the day after.

There are no anti-submarine patrol aircraft, they also have anti-submarine helicopters.

Whether it is a missile Destroyer or a frigate, it can carry military helicopters on missions. This time, they all brought anti-submarine helicopters without exception.

"Puff to pass ~", "Puff to pass ~", "Puff to pass ~"......

The orange red buoys that looked like fire extinguishers were thrown into the sea at a predetermined distance by helicopters or frigates.

These orange red buoys have a cylindrical shape like a fire extinguisher. They fall into the in the sea and splash insignificant waves.

The sonar buoy keeps an upright position and floats in the water. The excitation device detects the presence of seawater, and immediately ejects the sonar array from the outer shell. With the cable connection, it slowly sinks to the predetermined working depth under the action of gravity.

At the same time, the sonar buoy also sank into the water, and only a small, palm-sized fan-shaped signal receiving antenna protruded from the sea.

The sonar buoy is the "big net" of this [Whaling Operation].

The detection range of these sonar buoys is about 15 kilometers. The fleets on both sides of the Madagascar island have intensively placed more than 300 sonar signal buoys on this Sea Area.

They formed an airtight detection net underwater, quietly waiting for the arrival of the submarine from Monster industry.

In the evening, all the sonar signal buoys were put in.

In the combat command room of the two Burke-class missiles Destroyer, the electronic chart of represented and their mission Sea Area also lit up a red signal node in every corner.

These nodes transmit the sonar information they collected to the command ship at a frequency of once every two seconds.

The signal is transmitted by the short-range radio transmitters that come with sonar buoys, which emit high-frequency digital signals. The channel capacity is large, but the penetration is poor, and the signal attenuation is serious.

The signal only propagates in the mission area, and it must be equipped with a corresponding receiving antenna, so as to prevent the possibility of detecting the signal outside.

Four hundred sonar signal buoys transmit information every two seconds.

And here is one of the waterways of the African continent, so the sonar buoy quickly scans multiple [mechanical sound sources], and triangulates those sound sources based on the sound source time detected by adjacent sonar buoys Accurate location.

The moving tracks of the huge ships appear on the electronic warfare chart of immense.

modern|Hyundai sonar technology has been completely electronic and informatized.

Like in a naval battle movie, the sonar monitors are sitting in an airtight soundproof room, listening to the sound with headphones. It cannot be said that it is completely past tense, but it will certainly not appear at the moment when the approximate location of the target has not been confirmed.

At this time, in the combat command room, the sonar officers in charge of sonar information are taking a sip of coffee from time to time, and debugging device leisurely.

The sonar monitoring object is all the sounds in the ocean.

Whether it is waves, whales, dolphin, schools of fish, and boats made by humans large and small, they will make their own unique sounds in the sea.

In this, the sounds of ships made by humans are the most regular.

The sound of the propeller rotating and hitting water splashes, and the sound of the cylinder of a large engine hitting back and forth.

These countless sounds are brought together, and then transmitted by the sonar to the mothership. There is no need to distinguish them. A dedicated information processor will automatically match these sound sources according to the information in the voiceprint library.

The sounds of marine creatures and ocean waves are filtered, and the sounds of mechanical movements made by humans are marked in detail.

Another ~

These ships marked by sonar will also be scanned by frigates and advanced carrier-based radars on the Destroyer.

Radar can detect the outline and speed of this ship. Civilian ships are fundamentally different from military ships whether they are in mechanical power mode or shape speed.

So, within a few hundred kilometers of Sea Area on both sides of the Madagascar island, it is all within the grasp of the [Whaling Operation] military vessel.

……

The commander of the joint fleet, Rasit, sits on the Burke-class missile Destroyer of Sea Area on the south side.

Although the previous meeting estimated that the probability of the Monster industrial submarine going this side was only 10%. But Lassiter thinks that this 10% is likely to surprise him.

The radio is silent, and not all ships of representative disappeared from the vast sea.

modern|Hyundai warfare is all information warfare, and losing contact with the headquarters means fighting alone?

The radio is not available, they also have a satellite data link.

Satellites in space will continuously send data to the vast ocean. The military vessels who perform radio silence can passively receive information from the headquarters through satellite receivers.

Passive reception cannot be detected.

Lasit has received the latest satellite photos of the port from the headquarters. The strange dark submarine in the photo has disappeared.

It is noon, and in three to four days, the submarine will head into the enclosure.

Lassiter feels that there is plenty of time to take advantage of the rare leisurely rest of these few days.

After explaining the duty, Rasit just stepped out of the watertight door of the headquarters, and someone inside shouted: "Sir děng děng|etc|wait ~."

Lassiter moved back again and glared at the sonarman who stopped him.

"Sir..."

The sonarman stood up squeezingly, "Our carrier-borne passive sonar detected the anomaly voiceprint."

"How much anomaly is there?" Lassiter stepped forward somewhat displeased.

It is very common for sonar to detect anomaly voiceprints, especially the large sonar base installed under the Destroyer head. If Destroyer is stationary, it can even collect underwater anomaly voiceprints with a radius of thousands of square kilometers.

The premise is that this voiceprint is extremely large and can spread far away.

"Very special." The sonar's eyes only dared to stare at the screen, "Sir, we have never recorded this voiceprint before, and we have never even seen it."

"It... it feels like a supercar running wildly over the sea."

"Are you sure?"

"OK..."

Raxitte stepped forward quickly, "What is the distance of the voiceprint of anomaly?"

"Between 500 and 700 nautical miles." While reporting, the sonar also handed out the monitor headphones to Lassiter.

Sonar detection distance and detection of precision have always been a technical contradiction that cannot be achieved at the same time.

The large sonar installed under the Destroyer can detect the anomaly voiceprint of Sea Area far away, but it cannot lock the specific location of the sound source through the voiceprint, and even the direction can only get a vague approximation.

Those sonar buoys placed in the Sea Area hundreds of kilometers around have a very short detection range, but the detection precision is higher than radar.

In addition, it also has the function of collecting voiceprints.

Lassiter puts on the monitor headphones.

Then he heard the anomaly voiceprint filtered by the processor.

If you are not a professionally trained person, it is basically impossible to hear what anomaly is in this voiceprint clip specially marked by the processor as [anomaly].

ordinary people listened, only "Ziziwu ~" sound like electric current.

But Lassett has received professional training. Even if the training time is not long, he can still catch anomaly from these electric sounds.

It was a repetitive mechanical sound with extremely high frequency.

The sonar is right~IndoMTL.com~It sounds very similar to the roar of a supercar engine.

But!

But if the target is a speedboat with a professional high-speed engine, it is being driven by a rich man.

It is impossible to travel hundreds of nautical miles underwater.

The hull structure determines its engine power and propeller size.

The smaller the power and size, the smaller the sound source spread.

Unless...

Unless the target is an ocean-going ship of more than 10,000 tons.

Isn’t this a joke that a huge ship with a 10,000-ton level or more makes the rapid reciprocating sound of the engine that can only be found in supercars?

Dear, click in, give a good comment, the higher the score, the faster the update, it is said that the new full marks are found at the end of the beautiful wife!

cell phone station brand new revision upgrade address: data and bookmarks are synchronized with the computer station, fresh reading without ads!