Regarding this huge problem of underwater communication, when the project team reported to Duke, Duke felt helpless.

The most commonly used long-distance water acoustic communication technology at the bottom of the water. Although the propagation distance can reach tens of kilometers, water acoustic communication uses analog sound wave signals. The waves, fish, ships, etc. in the ocean produce various sound wave noises all the time, which makes the sound field in the ocean extremely chaotic. Therefore, the interference factors when sound waves are transmitted in sea water are much more complicated than in air propagation.

At the same time, the attenuation of the energy propagation of sound waves in water is much faster than that of electromagnetic waves in the air, which leads to a narrow bandwidth of water acoustic communication, low applicable carrier frequency and large transmission delay, resulting in a very low efficiency of the entire transmission system. Often, the signals received under the water are blurred. For the reception and decoding process of the signal receiver, it is extremely difficult to ensure accurate communication.

However, in terms of the principle of this communication technology, Duke basically has no possibility of a short-term breakthrough, and there is no unique technology in Kerry's knowledge base that can make underwater communication convenient and fast. What Duke can do is to enhance locally, such as through an efficient signal processor composed of an intelligent analysis engine and a new high-speed computing chip, the bit error rate of water acoustic communication can be greatly improved at the receiving and processing end, and to a certain extent, the submarine's ability to communicate underwater to a submarine.

However, these are only partial improvements, and they are still completely unable to meet the large data exchange of the theater joint combat system.

"At present, there is only one way to solve the problem of high-speed communication when submarines are submersed, that is, towed float antennas, which will emerge on the sea surface, and enable long-range direct communication between submarines and bases, fleets or aircraft through slender cables. In addition, as long as the submarine dives more than 200 meters, even if VLF ultra-long wave communication is used, the submarine can only receive extremely limited information unilaterally." Professor Yu Deming, an expert in submarine communication technology from the Navy Submarine Academy, introduced to Duke as an expert in the overall group of the Submarine Dragon Project.

"Among our country's submarines, the most widely equipped T-HU80 buoy antenna, which allows submarines to use at submarine speeds of 8 to 10 knots when diving 200 meters. It has 15 watts of power to communicate with external bases, fleets or aircraft through six preset channels in the HF and UHF bands." Professor Yu Deming continued.

"Although this aspect has solved the communication problem in the submarine's submarine's submarine state, this communication method can easily expose the submarine's position to the enemy. The enemy can track and locate the submarine by tracking and positioning the submarine, which makes the submarine lose its greatest hidden characteristics. It not only greatly reduces the suddenness of the submarine's attack, but also is very likely to bring disaster to the submarine.

Therefore, under normal circumstances, the submarine forces implement radio silence without turning on radio communication at will, especially nuclear submarines. They are basically unilaterally receiving bases to convey extremely limited enemy information and command information in the past." The fire of hope that Duke had rekindled was soon extinguished by Professor Yu Deming's words.

"Professor Yu, what are the main ideas for solving these problems in your research?" Duke asked modestly. He had almost no technical accumulation in this submarine world problem.

"Director Du," Professor Yu Deming said with shame after a wry smile, "The solutions we have considered have basically been denied after research and experiments. Because there is actually a huge paradox to solve this problem. On the one hand, we need to use technical methods that can be transmitted from a long distance on the sea surface to spread information. On the other hand, this communication method that can be transmitted from a remote place will inevitably be listened to by the enemy to expose the submarine target.

Under the current technical conditions, no country, including the United States, has a better solution to this. The dragged buoy antenna is the best solution at present. Since it can be used in mobile situations, it is difficult for the enemy to locate the specific position of the submarine. To a certain extent, this communication method better takes into account the issues of communication and security.

Of course, due to the limited underwater speed of submarines, once communication is heard by the enemy's detection system in this way, they can still greatly reduce and lock the submarine's range of activities. In this way, it is still quite dangerous for submarines that are active near the enemy, because anti-submarine aircraft and anti-submarine helicopters can conduct large-scale rapid searches, and such a range of activities will be difficult for submarines to escape the enemy's searches." As an expert who has studied this area for decades, Professor Yu Deming is very familiar with the advantages and disadvantages of various submarine communication technologies.

Once communication is started, the target will inevitably be exposed and the submarine will lose its greatest support. However, if communication is not started, true coordination will not be achieved between submarines operating in the same combat zone, and the combat power will be concentrated to attack the most valuable targets in the combat zone. This will not be able to significantly improve the combat power efficiency of active submarines. Faced with such a dilemma, Duke fell into deep thought.

In the next few days, Duke was immersed in this problem. In the eyes of Duke's family, Duke looked a little dazed and out of mind. "Duke, have you encountered a problem again?" Shu Ya saw that Duke was in poor mental state these days and asked with concern. On weekdays, Duke would get in when he encountered problems, and usually he was busy looking for various materials or conducting endless experiments. However, Shu Ya rarely saw Duke's helplessness and doing nothing.

"Well, I really can't figure out a problem. Don't worry, I'm fine." Duke replied. "I don't have any idea to solve this problem now, and I can't find a direction to work hard at all."

"Then let's take a break." Shu Ya smiled and comforted. "Let's relax, maybe there will be a flash of inspiration, and you will have to relax and relax when doing research. Anyway, my son has been clamoring to go to Ocean Park for several days. Why don't we take him to Ocean Park to play together, and you can relax and relax."

Before Duke could agree, his son was already so happy that he applauded, "Go to Ocean Park! Dad, I want to watch the dolphin show!"

Seeing his son's appearance, what else can Duke say?

However, Duke is now at the highest level of security in China. Even if it is a small trip, it must be crowded with people. At the commanding heights of buildings near the park, people must be sent to clear the ground and control it in advance. Therefore, even if Duke agreed to accompany his son to watch the dolphin performance, he waited for more than an hour for the security personnel to complete the security layout before traveling.

Such troublesome preparations are the biggest reason why Duke would rather choose to live in seclusion or go to some remote places on weekdays. But now the security team responsible for Duke's security really cannot expect Duke to have the same luck as last time after the attack, so they must eliminate the threat in the bud.

However, when Duke saw his son's joy when he watched the dolphin performance, he felt that today was worth it, so he gradually began to relax. He laughed constantly for the wonderful performance of the dolphins with his son. There were 4 dolphins performed in the aquarium today. The trainer led these smart dolphins and performed a lot of coordinated actions. Compared with a dolphin performance, this group performance is obviously more difficult, but in the eyes of the audience, the viewing ability has also been greatly improved. Just by hearing the constant marvelous sounds in the audience, you will know how fascinating the performance of these dolphins is.

"Dad, when I grow up, I have to raise a large group of dolphins in the swimming pool at home to play with me," Duke's son said with excitement. "Look, they can be lined up and diving together. If I raise a large group, it will definitely be more fun. I can also ride dolphins around in the water. How fun."

"Good son, dolphins are not that easy to raise. You see, such a big one, it takes a big pool to raise. It's hard to raise a swimming pool in our house, let alone a group of them." Duke couldn't help laughing when his son said this. Suddenly, Duke's heart moved, and he seemed to have grasped something in his mind, and his body was still there, as if it had been petrified.

Looking at Duke's appearance, Shu Ya, who had been watching the father and son having fun, quickly pulled her son over and asked Duke to continue thinking about his affairs. Although Shu Ya didn't know what Duke was thinking about now, this situation is usually the moment when Duke's inspiration appeared. At this time, Shu Ya's most important thing is not to let his son disturb him.

"A group of fish? A group of fish?" Duke murmured to himself. An idea was about to burst out in his mind, but he was still covered with a layer of gauze, just a little bit worse. He was thinking about his own thoughts like a god, and he didn't notice when his son had been quietly pulled aside by his mother and didn't talk to him.

Although there were still audiences around to cheer for the dolphin performance, Duke was completely immersed in his thoughts that had a flash of inspiration and almost forgot the world in front of him. After a long time, Duke finally grasped this illusory idea.

"Fish? Bait? Yes, fish bait!" Duke suddenly slapped his thigh, and a new idea burst out from his mind. To be honest, although Duke's new idea is technically difficult, it is not impossible for Duke to solve and implement it. Through such a new idea, a new window has been opened to solve the world-class problem of submarines' external two-way high-speed communication and submarine concealment.

(There is another update after 11pm!)
Chapter completed!