How the submarine is in the sea and how to contact the headquarters

When navigating on the surface and at the periscope, submarines rely mainly on radio short-wave communications (wavelengths ranging from 10 to 100 meters). Short-wave communication is a communication method that uses electromagnetic waves to transmit a certain signal in the air, and is the main way for submarines to communicate with the command organization on shore, which is a two-way communication. However, the short wave cannot be used in the water, because the short wave decays too quickly in the water, and it is exhausted before it reaches the water surface, so the transmitting antenna must be stretched out of the water to work properly.

But the length of the lifting antenna device of the submarine is limited, in order to solve the problem of short lifting antenna, also can adopt buoy antenna or buoyancy antenna, that is, the antenna is applied to the water surface or close to the water surface through a long rope, so that the submarine can also transmit signals at a certain depth underwater. In fact, there is still a problem of self-exposure of submarines, because submarines must use high-power transmitters to communicate with short-wave at long distances, and their signals themselves are not secret, and may be intercepted and deciphered by the enemy, and then the position of the submarine can be measured; Moreover, there is a possibility that the mast or buoy that is outcropping from the water can be detected by enemy radar, so the submarine's transmission to the outside world should be strictly controlled. There is also a two-way communication method - satellite communication using UHF and UHF.

However, satellite communications still require submarines to float to periscope depth and raise antennas to the surface, and satellites are vulnerable to enemy destruction during war, so they are still not ideal from a concealment point of view.

At present, if a submarine does not cast a communication buoy underwater, it will not be able to actively communicate with the shore, so the submarine can only passively and unilaterally receive the radio ultra-long-wave signal or the extremely long-wave signal on the shore, which is the main way to communicate with the submarine on the shore. The wavelength of ultra-long wave is 10,000 to 100,000 meters, it can drill into the water from the air, the attenuation in the water is relatively small, and the depth of penetrating the sea water can reach up to 30 meters, so that the underwater submarine can receive the radio waves sent from the shore.

With a wavelength of more than 100,000 meters, the extremely long wave can communicate with submarines almost on a global scale, penetrating the water layer to a depth of more than 200 meters, and reaching about 80 meters underwater even at the maximum distance. In 1972, the U.S. Navy's Wisconsin Extreme Long-Wave Communications Test Base conducted a launch test, and a U.S. nuclear submarine Black Trevally, 120 meters underwater in the Atlantic Ocean 4,600 kilometers away, received the station's signal.

The submarine only receives signals in the sea and does not send them outward.

Asking for instructions is sent over the radio (just like a text message on a mobile phone), but it is very easy to detect (if the submarine is discovered before the attack, it loses most of the time). But it is generally only accepted.

Strategic submarines generally do not take the initiative to contact the base, and they all maintain radio silence, and attack nuclear submarines and conventional submarines use radio because they will not leave the mainland too far.

Hello, it is a pleasure to serve you with the following answer: submarines can be found in the ocean, but also in freshwater lakes. Causes of the problem:

1.As submarines dive underwater, they can hit wrecks, diving objects, or other submarines, causing damage. 2.

If the submarine breaks down during the diving process, it can also cause damage to the submarine. 3.There may be problems with the submarine's battery base, causing the submarine to not work properly.

Workaround and practice steps:1First of all, it is necessary to check the appearance of the submarine, making sure that the submarine is not damaged.

2.Secondly, the submarine's battery needs to be checked to ensure that it is working properly. 3.

Finally, the submarine's control system needs to be checked to ensure that the submarine is given the correct instructions. Related knowledge: A submarine is an underwater vehicle consisting of a series of electronic, mechanical and water systems that is capable of diving underwater and is able to resist the pressure of the deep sea.

The submarine's electronic, mechanical, and water systems are all important to help the submarine navigate underwater and to ensure its safety.

If you want to use a mobile phone, you must not be able to use it, there are wireless signals and the like on the submarine, and if there is a problem, the SOS signal will be sent.