Monster Factory

The Pentagon's experts are very good at research.

The humpback whale wants to return to Zhongyun City, naturally along the southern part of the African continent, and finally passes through the side of Madagascar.

However on both sides of the island of Madagascar.

Two Burke-class guided missile destroyers and four frigates have been lined up in a battle formation on both sides of the sea.

Each blockade line is centered on the Burke-class guided missile destroyer. Two frigates are responsible for the sonar buoys, while the Burke class releases the sqr-20 main passive towed sonar system.

There are no special anti-submarine ships in their naval formations.

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

Sky Power is two p-8 anti-submarine patrol aircraft.

However, the joint fleet commander Rasit believes that the submarine of the Beast Industries must have at least three to four days of flight time to travel from the seaside port of Nigaya.

So they just started to arrange the sonar detection equipment in advance, and the anti-submarine patrol aircraft will arrive here to patrol the day after tomorrow.

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

Whether it is a guided missile destroyer or a frigate, it can carry military helicopters to perform tasks. This time, they all brought anti-submarine helicopters without exception.

“噗通～”, “噗通～”, “噗通～”...

Orange-red buoys, like fire extinguishers, were thrown into the sea by helicopters or frigates at predetermined distances.

These orange-red buoys are fire extinguisher-like cylindrical shapes that fall into the sea and splash a tiny spray.

The sonar buoy keeps the upright posture floating in the water, and the excitation device detects the presence of seawater. Immediately, the sonar array is ejected from the outer casing, and connected by a cable to let it sink into the predetermined working depth under the action of gravity.

At the same time, the sonar buoy also sinks into the water, and only a small palm-shaped signal receiving antenna is found on the sea surface.

The sonar buoy is the "big net" of this [whaling action].

These sonar buoys have a detection range of about 15 kilometers. The fleets on both sides of the island of Madagascar have placed more than 300 sonar signal buoys in this area.

They formed an airtight detection net under the water, waiting for the submarine of the behemoth industry to arrive.

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

In the operational command rooms of the two Burke-class guided missile destroyers, on the electronic chart representing the mission area, they also lit up a red signal node in every corner.

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

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

The signal propagates only within the mission area and is equipped with a corresponding receive antenna to prevent the possibility of external signals being detected.

Four hundred sonar signal buoys, transmitting information every two seconds.

Here, it is one of the navigation channels of the African continent. Therefore, the sonar buoy quickly scans a number of [mechanical sound sources] and locates the exact position of those sound sources by the sound source time detected by the adjacent sonar buoys.

The trajectory of a huge ship appears on a huge electronic warfare chart.

Modern sonar technology has been fully electronically informatized.

In a naval battle movie, the sonar monitors appear in the airtight soundproof room, relying on the scenes with headphones to listen to the sound. It can't be said that it has become a past tense, but it certainly won't appear at the moment when the target's approximate position has not been confirmed.

At this time, in the combat command room, the voice singers who are responsible for the hoarse information are taking a sip of coffee from time to time, and tidying up the equipment.

The sonar monitor object is all the sound in the ocean.

Whether it's waves, whales, dolphins, fish, and ships made by people of all sizes, they all have their own unique voice in the sea.

Here, the sound of ships made by humans is the most regular.

The propeller rotates and hits the sound of the water, and the cylinder of the large engine impacts back and forth.

These countless kinds of sounds come together and are transmitted to the mothership by the sonar. There is no need to distinguish between them. A dedicated information processor automatically matches these sources based on the information in the voiceprint library.

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

In addition~

These ships, which are marked by hoarseness, will also be scanned by advanced shipborne radars on frigates and destroyers.

The radar can detect the contour of the ship as well as the speed of the ship. The civil vessel is essentially different from the military vessel in both the mechanical power mode and the shape speed.

Therefore, in the hundreds of kilometers on both sides of the island of Madagascar, the warships in the [Whaling Operation] are in control.

......

Joint Fleet Commander Rasit sits on the Burke-class guided missile destroyer in the southern waters.

Although the previous meeting estimated that the submarine of the Behemoth Industry is only 10% on this side. But Rasit feels that this 10% is likely to surprise him.

The silence of the radio does not mean that all ships have disappeared from the sea.

Modern warfare is an information warfare, and losing contact with the headquarters. Is it equal to fighting alone?

Radios are not available, they also have satellite data links.

Satellites in space will continuously send data to the vast sea. The warships that perform radio silence can passively receive information from the headquarters through satellite receivers.

Passive reception cannot be detected.

Rasit has received photos of the latest port satellites from the headquarters, and the strange dark submarine in the photo has disappeared.

It is noon now, and after three to four days, the submarine will crash into the encirclement.

Rasit feels that time is abundant, and he can take advantage of the rare rest and rest of these days.

After explaining the duty task, Rasit’s forefoot has just stepped out of the watertight door of the headquarters. Someone shouted: “Wait~ sir.”

Rasit regained his body and glanced at the voice screaming at him.

"Sir..."

The voice screamed and stood up. "Our shipborne passive sonar has detected abnormal voiceprints."

“How many anomalies?” Rasit walked a little unhappy.

It is common for sonar to detect abnormal voiceprints, especially large sonar bases mounted under the destroyer's head. If the destroyer is stationary, it can even collect underwater anomalous voiceprints of thousands of square kilometers.

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

"Very special." The voice of the voice officer only dared to stare at the screen. "Sir, this voice has never been recorded, and we have never seen it."

"It... it gives the impression that it is like a super run running wildly on the sea."

"you sure?"

"determine……"

Rasit hurried forward, "How much is the abnormal voiceprint?"

"Between 500 and 700 nautical miles." At the same time as the voice reporter reported, he also handed out the monitor headphones to Rasit.

The sonar detection distance and the detection accuracy have always been technical contradictions that cannot be combined.

The large sonar mounted under the destroyer can detect abnormal voiceprints in the far-distance sea, but it can't lock the specific position of the sound source through the voiceprint, and even the orientation can only get a blur.

The sonar buoys that are placed in the seas hundreds of kilometers around, the detection range is extremely short, but the detection accuracy is higher than the radar.

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

Rasit brought a monitor.

Then he heard the abnormal voiceprint that had been filtered by the processor.

Those who have not received professional training are basically unable to hear the voiceprint segment that is specifically marked as [abnormal] by the processor. What is abnormal?

Ordinary people listened, only "sweet 呜呜 ~" similar to the current of the same sound.

However, Rasit has received professional training, and even if the training time is not long, he can catch abnormalities from these current-like sounds.

It is a repetitive mechanical sound with a very high frequency.

The voice singer is right, it sounds like the engine of the super-running roar.

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 spread hundreds of nautical miles in the water.

The hull structure determines its engine power and propeller size.

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

unless……

Unless the target is a 10,000-ton oceanic ship.

A huge ship of more than 10,000 tons, but there is a rapid reciprocating movement of the engine that is super-running. Isn't this a joke?