Siheyuan: I eat melons while doing scientific research

Chapter 1185: Various Anti-Submarine Methods

Gao Zhendong firmly believes that even if he is not there, as long as the seeds have been planted, the horizons have been broadened in advance, and certain economic and technical conditions are in place, then everything will not be a problem.

He has a clear definition of himself. He is not here to save anything. He just wants to make good things happen as early as possible.

The Defense Work Committee secretly applauded the Navy's decisiveness. Hey, there is strength in numbers. Finally, they are no longer the only ones worrying here. This is good.

Gao Zhendong didn't take it seriously and immediately changed the subject. There were plenty of technologies, especially those that only boasted about the prospects without talking about their realization. There were so many of them. If he wasn't afraid that there were too many things and would confuse his comrades, he could have talked about it for three days and three nights without stopping.

"Yeah, okay, just come find me when the time comes. Then let's talk about the next one, gravity gradient."

"Gravity gradient?" To be honest, this thing is a bit beyond the scope, especially for the comrades present.

A very counterintuitive fact is that, not to mention gravity, even in the 21st century we still haven't figured out what gravity is. A lot of related astrophysics knowledge that sounds familiar to people in the 21st century was actually not born or verified for a long time.

For example, black holes, and most of our superficial understanding of the universe.

As for the concept of gravity gradient, it is something that today's comrades would never have imagined could be used in this area. Even this concept, which began to take shape in the 19s, does not exist in the minds of most current comrades and is not even known to them.

In fact, this is not surprising. Even in the 21st century, not many people know about this thing. For example, Gao Zhendong is sure that 99.9% of the people in Citizens across the country don't know what this thing is. The education system in Citizens is extremely polarized, and there are really a lot of illiterate people.

Of course, the world's first usable gravity gradiometer was proposed by the American Air Force in 1970, and the only commercial gravity gradiometer for a long time until the 21st century was also from the Americans.

"Comrade Zhendong, please explain what this is."

"The gravity gradient is actually more accurately called the gravitational gradient. However, on Earth, it is mainly manifested as gravity, so here we use the gravity gradient instead. It is the rate of change of the gravity field in various places in space..."

After Gao Zhendong explained the gravity gradient, he said, "Since a high-density object like a submarine replaces seawater in the seawater, it will cause a change in the gravity gradient in the vertical direction. By using this change, we can use the difference between the calculated value and the measured value of the gravity gradient to detect the presence of large mass objects in the seawater. Of course, this thing is not only used for anti-submarine, but is more suitable for applications such as prospecting. The presence of minerals may cause abnormal measured values ​​of the gravity gradient, and this can also be used for prospecting. It is especially suitable for assisting the exploration of offshore oil and gas fields. The impact of oil and gas fields on the ocean gravity gradient is quite obvious."

My goodness, Comrade Gao Zhendong is now involved in prospecting. Magnetic anomaly detector, prospecting, gravity gradient, prospecting. The last time he went to Qianshan, he helped others identify a large bauxite belt. It seems that he has done some research in this area.

The navy had another idea. They had long known that Comrade Gao Zhendong was very interested in the sea. So, was he looking for resources in the end? Well-intentioned, well-intentioned.

But Gao Zhendong's thoughts went beyond this: "Moreover, this thing can be used for submarine navigation... especially deep-diving submarines..."

Hmm? If you mention this, I can't help but be interested! The navy comrade immediately became interested.

The navigation of submarines is actually a very troublesome thing, even in the era when global satellite positioning systems are everywhere, because they cannot receive GPS signals under normal working conditions, and no matter how accurate the inertial navigation is, there will be obvious cumulative errors in the complex movement state of submarines, resulting in frequent need to find ways to calibrate their own position.

In simple terms, if there is no good enough auxiliary navigation means, even a nuclear submarine with sufficient oxygen supply will have to surface from time to time to determine its position.

This is very dangerous for nuclear submarines that often perform missions in a lone wolf state, whether they are attack nuclear submarines or ballistic missile nuclear submarines.

Otherwise, the Citigroup Navy would not have used this thing to assist submarine navigation. This thing has a very important auxiliary significance for high-precision inertial navigation. In this regard, the Citigroup guys really thought of it and are willing to spend money.

Sea Wolf: Hey hey hey, bro, thinking about me?
While the Americans were fighting fiercely with the Russians, at least in science and technology, they could still be regarded as the light of mankind.

Why are there more and more uses? The leader of the Defense Work Committee couldn't help but ask: "What else is this thing used for?"

Gao Zhendong thought about it, sorted out his memory, and summarized: "It has important application value in the fields of high-precision inertial guidance, earth and space science, geological science, resource exploration, basic geological survey and research, oil and gas deposits, etc. If it is installed on aircraft or satellites, it will also be of great significance for basic measurements in mountainous areas, uninhabited areas and coastal continental shelves."

In fact, you can just fly and measure when you have nothing to do. If there is a significant change in the data, then there is a big problem.

"Isn't this difficult to do?" The Navy leader's eyes lit up. Gao Zhendong nodded: "Yes, I have considered many methods, including traditional torque-based, acceleration-based, and absolute gravity gradient measuring instruments such as atomic interferometry and laser interferometry. They are all simple in principle, but they require a lot of other technologies to coordinate the details in implementation, which is indeed difficult."

Gravity gradiometers were used by the military for a long time. It was not until the secret technology of the Navy was declassified and gradually made public that relevant civilian applications appeared. So it was not used for a long time, not because it was not useful, but before the Navy declassified this technology, no one knew that such a high-precision gravity gradiometer had been invented.

There is also laser. Compared with other comrades, this comrade is truly an expert in the application of laser.

"Comrade Zhendong, if we work together with our colleagues from the National Academy of Science and Technology and related universities, is it possible to break through this technology?"

Gao Zhendong nodded: "That's still possible. There are some types here that have relatively good conditions for implementation. It's just that this thing is actually a special instrument with a relatively narrow range of applications."

"Let's not talk about whether it's narrow or not. As long as it has a certain degree of specificity and clear targeting, it's enough for us to make some efforts in this direction. As the saying goes, a journey of a thousand miles begins with a single step. Isn't the overall strength accumulated bit by bit in these aspects? No matter how expensive this thing is, it won't be so expensive that it can't be supported, right?"

The leader of the Defense Work Committee laughed.

Gao Zhendong nodded: "That's not the case."

Scientific research always takes a lot of detours, but I can find a way out! The significance of scientific and technological development is that even a review paper decades later is still very important research material today. If there is also a monograph, it will be even more powerful.

"Then we can get this thing done! We will go find our comrades from the National Academy of Science and Technology and ask them to make the overall arrangements. As for you, Comrade Zhendong, the old rules still apply. You are responsible for leading the relevant comrades on the way." The leader of the Defense Work Committee said with a smile.

This model has achieved very good results in many subjects and equipment. It did not take up too much of Gao Zhendong's time, and his comrades also received training, and the final results were also excellent.

Gao Zhendong nodded. This was easy to say. He had already prepared for it.

"Are there any more?" The comrades' interest was growing.

"Yes, but just like the gravity gradient, it has great limitations," Gao Zhendong said with a smile.

"It doesn't matter if the limitations are big. As long as it's useful or has prospects, you can bring it up. We can use it as a technical reserve, or as a pre-research project reserve. Look at these comrades working on anti-submarine warfare. Their future jobs depend on you."

The leader of the Defense Committee made a joke and all the comrades laughed. Some of the comrades who were engaged in anti-submarine work also joined in the fun and made a few jokes.

"Okay, but the next one is more targeted, mainly for diesel-electric submarines, exhaust gas detection."

Exhaust gas detection? Can submarines detect exhaust gas in the sea?
In fact, this thing is not complicated. Diesel-electric submarines will produce exhaust gas during the combustion process, especially carbon monoxide, which is an exhaust gas with obvious significance. Moreover, this thing will be distributed within an altitude of 100 to 300 meters and last for a long time. For anti-submarine patrol aircraft passing by, it is an obvious submarine search sign.

"Hey, this is not bad either. Although it is too targeted, we cannot ignore diesel-electric submarines."

"Yes, the technology of exhaust gas detection is relatively mature. Even if it is not mature, it can be matured, and the effect is good and immediate. The technology is simple, so it is always right to try it out."

"Commissioner Gao, this is very advanced, and very down-to-earth."

This one is very down-to-earth, but the next one is not so down-to-earth. Gao Zhendong took out the last non-contact anti-submarine technology that is worth studying in the near future.

"Comrades, we are almost done. The last one is the extremely low frequency electromagnetic wave (ELF) detection."

Extremely low frequency electromagnetic waves? That is, long waves. Isn't this used for communication? In theory, detection of this thing is indeed useful, but as long as the submarine does not communicate, it is meaningless.

"Commissioner Gao, enemy submarines should rarely use extremely low frequency electromagnetic waves to communicate, right? This means of communication is too slow and generally will not be used unless it is absolutely necessary. Detecting this thing may not be very meaningful."

(End of this chapter)