Monster Factory - 1288

The Pentagon group of experts have done the right research.

When the humpback whale wanted to return to Zhongyun City, it naturally went south along the African continent and finally passed through the side of Madagas.

At this time, however, on both sides of Madagas.

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

Each blockade line is centered on the Burke-class guided missile destroyer. Two frigates are responsible for launching sonar buoys, while the Burke-class released a big killer-the SQR-20 active and passive towed sonar system.

In their naval formations, there are no special anti-submarine ships.

At present, the functions of warships are modular and diversified. According to the tactical equipment carried by each warship, 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, the commander of the joint fleet, Rasit, believes that the submarine of the Giant Animal Industry must have at least three to four days to travel from the seaside port of Nicaya to here.

So they just started to arrange sonar detection equipment in advance, and the anti-submarine patrol plane would arrive here to start patrols only the day after tomorrow.

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

Both guided missile destroyers and frigates can carry military helicopters on missions. This time, they all brought anti-submarine helicopters without exception.

“Puff through~”, “Puff through~”, “Puff through~”…

The orange-red buoys, which 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 sea and splash insignificant waves.

The sonar buoy remains upright and floats in the water. The excitation device detects the presence of sea water and immediately ejects the sonar array from the shell. With the cable connection, the sonar array 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 was protruded on the surface of the sea.

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

The detection range of these sonar buoys is about 15 kilometers. Fleets on both sides of Madagas Island have intensively dropped more than 300 sonar signal buoys in this sea area.

They formed an airtight detection net underwater, quietly waiting for the arrival of the submarine of the Giant Beast Industry.

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

In the combat command room of the two Burke-class guided missile destroyers, on the electronic chart representing the sea area of their mission, a red signal node was lit up 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 through the short-range radio transmitters of the 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 the signal being detected by the outside world.

Three 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 the precise location of those sound sources by using the sound source time detected by the adjacent sonar buoys.

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

Modern sonar technology has been completely electronic information.

Like in a naval battle movie, the sonar monitors are sitting in an airtight soundproof room, listening to the sound by wearing earphones. 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 were taking a sip of coffee from time to time, and debugging the equipment leisurely.

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

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

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

The propeller spins and hits the splash sound, and the cylinder of the large engine hits back and forth.

These countless sounds are brought together, and then transmitted to the mothership by sonar, without any artificial distinction. The dedicated information processor will automatically match these sound sources according to 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~

Once these ships marked by sonar approach the interception net, they will be scanned by the advanced shipborne radars on frigates and destroyers.

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

Therefore, hundreds of kilometers of waters on both sides of Madagas Island are all within the control of the warships of the [Whaling Operation].

…

Rasit, the commander of the combined fleet, sits on the Burke-class guided missile destroyer in the southern waters.

Although the previous meeting estimated that the odds of the submarine of the giant animal industry going to this side were only 10%. But Lassiter thinks that this 10% is likely to surprise him.

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

Modern warfare is all about information warfare. If you lose contact with the headquarters, does it mean 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 warships that perform radio silence can passively receive information from the headquarters through satellite receivers.

Passive reception cannot be detected.

Lassiter 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.

Lassett felt that there was 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: “Wait~sir.”

Lassiter moved his body back again, and glared displeasedly at the sonarman who stopped him.

“Sir…”

The sonarman stood up awkwardly and whispered: “Our ship-borne passive sonar has detected an abnormal voiceprint.”

“How abnormal?” Lassiter stepped forward sullenly.

It is common for sonar to detect abnormal voiceprints, especially the large sonar base installed under the bow of the destroyer, and the SQR-20 active and passive towed sonar system connected to the stern.

If the destroyer is stationary, it can even collect abnormal underwater 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.”

“you sure?”

“Sure……”

Lacy stepped forward quickly, “What is the distance of the abnormal voiceprint?”

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

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

The large sonar and drag sonar installed under the destroyer can detect abnormal voiceprints in extremely distant waters, but it cannot pinpoint the specific location of the sound source through voiceprints, and even the orientation can only give a vague approximation.

Those sonar buoys that are dropped into the surrounding waters of several hundred kilometers have a very short detection range, but the detection accuracy is higher than that of radar.

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

Lassett puts on the monitor headphones.

Then he heard the abnormal voiceprint filtered by the processor.

People who have not received professional training are basically impossible to hear what is abnormal in this voiceprint clip specially marked by the processor as [abnormal].

When ordinary people heard it, there was only a “zizi woo woo~” sound similar to electric current.

But Lassiter has received professional training, even if the training time is not long, he can still catch the abnormalities in these electric sounds.

It was a repetitive mechanical sound with extremely high frequency.

The sonar was right, it sounded very much like the roaring engine of a supercar.

but!

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

It cannot 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 propagation will naturally be.

unless……

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

A huge ship of more than 10,000 ton class, but the sound of the engine’s rapid reciprocating motion that can only be found in supercars, is this a joke?