What kind of "artifact" is the unmanned submersible captured by China Navy?

The underwater unmanned submersible released by Badics in the South China Sea is mainly used to detect the marine environment in the South China Sea, and its military use involves three aspects: first, marine geological elements; Second, marine hydrological elements; The third is the environmental elements of underwater acoustic warfare.

(1) Marine geological elements of the South China Sea that can be detected by the U.S. underwater unmanned submersible.

The geological elements of the ocean battlefield mainly include seabed topography, ocean gravity and ocean magnetism. Modern submarines and intelligent torpedoes can make use of the complex terrain on the seabed to successfully hide themselves and attack the enemy unexpectedly. At the same time, in the modern ocean battlefield, the ocean gravity field has a great influence on the hit accuracy of long-range attack weapons. In addition, the use of magnetic elements is also the focus of the development of maritime operations. The navy can realize rapid anti-submarine by using a large number of helicopters with fast speed and wide search range and applying "magnetic differential anti-submarine technology" Practice has proved that seemingly peaceful marine geological elements, with the support of high technology, can establish an invisible defense line and become a powerful weapon to detect and destroy the enemy.

(2) The marine hydrological elements of the South China Sea that can be detected by the U.S. underwater unmanned submersible.

Marine hydrological factors mainly include three static factors: temperature, salinity and depth, and three dynamic factors: current, wave and tide. They are the marine elements that have the closest relationship with ships and have the greatest influence on them. Temperature is the decisive factor of the sound speed of seawater, which will affect the operational effect of sonar; Salinity (density) is the primary parameter of submarine diving and constant depth navigation; Depth is an important symbol of ship navigation safety; Waves and currents always affect the ship's trajectory; The change of tide determines the success or failure of landing and landing resistance. For example, nuclear submarines mainly rely on their own inertial navigation system for positioning. The biggest error source of this method is the deviation caused by the current acting on the nuclear submarine, and the long-distance error is huge, so it is necessary to correct the current accurately. A nuclear submarine with a wide range of accurate ocean current data can sail a long distance in the ocean and reach the combat sea area accurately.

(3) Environmental elements of underwater acoustic operation in the South China Sea that can be detected by the U.S. underwater unmanned submersible.

Underwater acoustic technology is the forerunner of all underwater military activities, which determines the success or failure of submarine detection/anti-submarine, submarine covert navigation, torpedo guidance, mine deployment, mine clearance, underwater acoustic reconnaissance, underwater acoustic communication, underwater acoustic navigation and other military activities. The main elements of the marine acoustic combat environment are: the distribution characteristics of ocean sound velocity, ocean background noise, underwater acoustic signal propagation characteristics, underwater acoustic signal reflection characteristics and ocean reverberation. In order to give full play to the operational performance of underwater acoustic weapons and equipment, navies of various countries actively deploy marine acoustic environment surveys. The United States claims that there are more than 600 submarines in the world, and the marine acoustic environment monitoring ships in the United States and Japan have records of acoustic spectrum characteristics; Once these submarines appear, the US and Japanese navies can quickly determine which submarine belongs to which country. Therefore, for a long time, the US military has frequently sent warships to conduct reconnaissance and military surveys in the waters facing China, and its military intentions against China are obvious.