Chapter 489： active sonar

USS Nimitz, bridge command room.

Time is passing little by little, and everyone is expecting to find the Soviet submarine hidden on the seabed, but, until now, nothing has been found!

"Our anti-submarine aircraft did not search for suspicious underwater targets." Miller said: "There should be two possibilities, either, the Soviet submarine has gone, or our Groton misjudged, the water There are no Soviet nuclear submarines at all."

Miller believes in the advanced technology of the U.S. Navy. Since he has been busy for so long and has not found any underwater submarines, it can only mean that there are no Soviet submarines at all!

Putting down his cigar, Jonathan shook his head: "No, I think there is another possibility."

Another possibility? Miller looked at Jonathan, puzzled.

"This is the latest nuclear submarine of the Soviets. This nuclear submarine is so quiet that it is impossible to detect it with our existing anti-submarine capabilities," said Lieutenant General Jonathan.

"How is this possible? The Soviet submarines have always been noisy, and their propellers have no advanced processing technology." Miller said.

"If it was in the past, it was absolutely impossible, but now, it is different." Jonathan looked at Miller, looking at each other, his eyes can tell a lot of problems.

Damn island! This country, which the United States fully supported, turned against the tide in the end, causing the United States to lose a lot! If there is the technology of island countries, it is completely possible for the Soviet Union to improve nuclear submarines!

"Last year, we noticed that the shape of the propellers of the newly launched Soviet nuclear submarines has changed greatly. Through the agents, the information we obtained is that the Soviet Union has mastered the processing technology of the seven-blade large skew propeller." Jonathan Go on.

For a submarine, the propeller at the tail is the biggest secret. It can be seen in various existing pictures that when the submarine is launched, the propeller at the tail is wrapped to prevent leakage of the parameters of the propeller. For Western countries, just by looking at the shape of the propeller, you can guess the characteristics of underwater sound.

Miller frowned: "If that's the case, it might be our mistake."

If the new submarine is newly launched, if its own underwater sound characteristics cannot be obtained, it will not be stored in the database of the sonar system. When the sonar system is working, it may filter out this weak sound as a normal sound! Therefore, during the Cold War, when the US and the Soviet Union faced off against submarines, a very important point was to obtain the characteristics of each other's underwater sound signals!

"Maybe, there are no Soviet submarines underwater, but if there is, it is a great threat to us. The Soviet Oscar-class nuclear submarines, equipped with SS-N-19 anti-ship missiles, are designed to attack our aircraft carriers. Formation, we must not take it lightly!" Lieutenant General Jonathan said: "I suggest to conduct a comprehensive scan immediately, first of all to ensure the safety of our fleet!"

"Yes, order all anti-submarine aircraft to dispatch and throw active sonar buoys! All warships, turn on their sonars, and conduct active search!" Miller immediately issued an order to his aircraft carrier formation.

The Kitty Hawk on the other side also conveyed the order at the same time.

The U.S. Navy has long since phased out anti-submarine rockets and has no Soviet-like carpet bombing capabilities, but it would be a big mistake to say that they have nothing to do with ultra-quiet submarines.

Surface ships have enough means to deal with underwater threats. For example, use the ship's own sonar to turn on the active mode!

All warships, except small patrol boats, are equipped with sonar, which is generally installed in the front, also commonly known as hull sonar or bulbous bow sonar. The special ship-shaped bow structure designed for resistance, there are many turbulent currents that cause strong interference and affect the sonar work, so it is not suitable for the sonar dome. The real sonar dome is lowered deeper than the keel and made Streamlined and smoothed with the hull to reduce the effects of turbulence, and the sonar array is installed in this sonar shroud that dips deeper than the keel.

In this shell, there is the sonar array of the cylindrical array. This sonar has two modes: active and passive. In later generations, these two modes can be completely integrated into the same array, and they are still separated now.

Generally speaking, passive sonar is used to monitor underwater sounds, while active sonar is used to locate the target, track and fire the submarine after finding it, and bind the launch data to the torpedo.

And now, with the command of the supreme commander, all sonars have turned on the active mode!

This seems to be a bit of a rogue, or a dead pig is not afraid of boiling water. After all, the noise of surface warships is far greater than that of underwater nuclear submarines, at least 20 decibels higher. Therefore, surface ships are easily detected by underwater submarines. , but it is not easy to find underwater submarines. In this case, the passive method is not easy to use, so just use the active method!

I can't believe I can't find you with a flashlight!

At this time, the size of the warship will also play a key role, because the aperture of the first integrated sonar cylindrical array of the warship varies greatly according to the size of the hull. The diameter of the integrated sonar array may reach more than 4 meters. For example, now, the sonar on the bow of the USS Nimitz has a diameter of more than four meters! When the active mode is used, the action distance of the underwater submarine can exceed 20 kilometers!

The anti-submarine arrays are lined up, as if combing the sea. All warships have turned on their active sonars penetrate the sea water and scan the silent world underwater. If there is one, you must find it. come out!

At the same time, all anti-submarine aircraft, including anti-submarine helicopters, took off from various warships and threw active sonar buoys according to their respective divided areas. It can be said that within a 100-kilometer range, all of them are the area they searched!

"Americans are crazy!" Inside K-146, Neil Geyev clenched his fists. To activate the active sonar in such a grand manner is simply fearless!

If during the war, if you face it head-on, you won't be afraid of it! The opponent's active sonar is just a flashlight, whichever light is stronger, whichever is a large warship, even if you don't use anti-ship missiles, you can kill it with a 650mm heavy torpedo!

And, apparently, the American aircraft carrier also activated active sonar! Nilgayev couldn't hold back his urge to launch a torpedo to beat him, but he was not ordered to fire.

Americans have a problem, see how they deal with it! Fortunately, I am guarding against the Americans!

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