China ‘Connects’ A UAV With A Submarine; Claims Developing Tech That Can Communicate From 30,000 Km

 China ‘Connects’ A UAV With A Submarine; Claims Developing Tech That Can Communicate From 30,000 Km




China claims to have developed and tested an underwater communication technology that enables drones and submarines to remain connected over more than 30,000 sq kilometers.


The South China Sea served as the testing ground for the technology.  in spite of to the reports, the listening instrument picked up sound signals from 105km away at a depth of 200 meters during a  pasture test in an  crucial passageway for submarines.


The latest experiment’s    searching exhibit the new technology’s usefulness and good performance in extending the range and effectiveness of underwater communication.


The data transfer rate was close to 200 bits per second (bps). This is comparable to the bandwidth of very low-frequency radio related to nuclear submarines by a naval command  apply the largest land-based antennae in the world. 


The researchers  assert that the encrypted messages were error-free despite loud background noises. This could be viewed as an important  change because, when  employ commercially available technology, the audio transmission of this speed and quality is regularly restricted to a range of less than 10 kilometers. 


In 2021, South Korean researchers used British hydrophones to establish a transmission rate of 128bps over a distance of 20km in an experiment. 


In 2017, researchers from Fudan University in Shanghai conducted an underwater test that  attain 1 gigabit per second over a distance of 63 meters (206 feet), setting a new record for China.


Low-frequency sound can transmit hundreds or even thousands of kilometers in the ocean, but detecting these signals and extracting useful  details can be challenging. 


When sound waves pass through streams or hit an ocean mountain, they can spread out in various directions and at various rates. As the signal travels farther, it becomes distorted and weaker when it reaches the receiver.


In a paper that was published in the domestic peer-reviewed journal Acta Acustica on September 6, project lead scientist professor Liu Songzuo of Harbin Engineering University explained the effectiveness of the technology, the Chinese report added.


Harbin Engineering University is one of the Chinese institutions sanctioned by the US government. 


The experiment was carried out by Chinese scientists on a 3,800-meter deep sea floor between the Taiwan-controlled Dongsha Islands, known in Taiwan as Pratas, and the highly contested Paracel Islands, known in mainland China as Xisha.


 in spite of to some military experts, the area a served as a crucial route for submarines entering and exiting the waters near China.  


The experiment was carried out on a stormy day, with waves crashing against the research ship and a strong sea current pulling the hydrophone array away from the ideal listening position. There was rugged topography  below the sea with cliffs and gorges that could absorb, deflect, and distort the sound waves.


The Chinese media report noted that more than 70% of the sensors were unable to detect anything in such a difficult environment. The signals picked up by the few sensors were barely a few decibels strong or quieter than a breath.


These signals were  normally drowned out by high background noise created by natural and human-made activity in the ocean. To address these issues, the team evidently devised a new communication protocol.


 stimulate by mobile phone a communications, the technique could package the signal into many discrete but connected parts and broadcast them as sound waves in all directions. Some of these waves could be picked up by the receiver a from different directions and at different times. 


An algorithm assisted the receiver in  recolonization these waves and reconstructing the entire message using random bits of the  obtain data. The mathematical model used in this study was constructed and assessed using real-world data obtained from the South China Sea to  build ed on its performance in the region. 


 

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