Internet in space
Today, an ordinary spacecraft "communicates" directly with the Earth. Only a few of them transmit a signal to an intermediate node, such as the Mars rovers Spirit and Opportunity, which conduct all communications through a probe located in the Martian orbit. However, they also require constant supervision by people who calculate the schedule of communication sessions, agree on all the necessary parameters.
The new method of communication is designed to automate and, accordingly, significantly speed up the process. A simplified prototype of such a network, which was a model of communications between a Mars vehicle, an orbital module and a base on Earth, recently successfully completed a monthly course of tests.
Especially for the "interplanetary Internet" a new data transfer protocol was developed, different from TCP / IP, which we use here on Earth. The fact is that the transmission inevitably leads to the loss of part of the data. TCP / IP-protocol in this case allows the sender and the recipient to communicate again and again, until all the necessary will not be transferred. This method is convenient for us when we stay connected to the network almost continuously. But in space, where spacecraft continuously move at high speeds, are shielded by flying planets, bursts of radiation and particle streams, where distances are so great that signal transmission takes significant time - this approach is ineffective in space.
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That is why it took to create a new protocol, called DTN (Delay-Tolerant Networking - “Network that is resistant to delays”). Here, the data intermediate nodes of the network, accepting the data, store them until they can pass them further along the chain. As a result, the transfer itself from the initial source to the recipient goes as if in one go.
Read more here .
The new method of communication is designed to automate and, accordingly, significantly speed up the process. A simplified prototype of such a network, which was a model of communications between a Mars vehicle, an orbital module and a base on Earth, recently successfully completed a monthly course of tests.
Especially for the "interplanetary Internet" a new data transfer protocol was developed, different from TCP / IP, which we use here on Earth. The fact is that the transmission inevitably leads to the loss of part of the data. TCP / IP-protocol in this case allows the sender and the recipient to communicate again and again, until all the necessary will not be transferred. This method is convenient for us when we stay connected to the network almost continuously. But in space, where spacecraft continuously move at high speeds, are shielded by flying planets, bursts of radiation and particle streams, where distances are so great that signal transmission takes significant time - this approach is ineffective in space.
')
That is why it took to create a new protocol, called DTN (Delay-Tolerant Networking - “Network that is resistant to delays”). Here, the data intermediate nodes of the network, accepting the data, store them until they can pass them further along the chain. As a result, the transfer itself from the initial source to the recipient goes as if in one go.
Read more here .
Source: https://habr.com/ru/post/46164/
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