Disruption Tolerant Networking to Demonstrate Internet in Space
by Lori Keesey for GSFC News
Greenbelt MD (SPX) Jul 23, 2018
NASA's Human Exploration and Operations and Science Mission Directorates are collaborating to make interplanetary internet a reality.
They're about to demonstrate Delay/Disruption Tolerant Networking, or DTN - a technology that sends information much the same way as conventional internet does. Information is put into DTN bundles, which are sent through space and ground networks to its destination.
Unlike the internet, where data packets are discarded when encountering a disconnection, DTN guarantees delivery even if there are interruptions. If the bundle fails to transmit because of unavailable links, DTN stores the bundles and waits until the next communication path opens.
Each DTN node or router can accept custody of the bundle and forward or retransmit the data, eliminating the need for an entire data retransmission from the original source should a disruption occur. This, in turn, saves time and more quickly frees up the limited data memory aboard a spacecraft - an important feature given the large amounts of data collected by satellite instruments.
NASA's Jet Propulsion Laboratory in Pasadena, California, first tested DTN during a science mission to a comet in 2008. That technology demonstration proved out the capability of DTN as part of the Deep Impact - EPOXI mission. PACE will take an important next step in using DTN as part of daily operations.
"DTN represents a shift in how data will get delivered in the future. I'm delighted PACE will become the first science mission to employ DTN," said David Israel.
Targeted to launch in the early 2020s, PACE will advance scientists' ability to assess the health of Earth's oceans by measuring the distribution of phytoplankton, tiny plants and algae that sustain the marine food web. It will also continue systematic records of key atmospheric variables associated with air quality and Earth's climate.
DTN could become a communication necessity for all types of terrestrial applications. Any remote location on Earth that has limited network connectivity is a candidate for DTN, Israel said.
NASA plans to build out a Solar System Internet with international partners, beginning with NASA's Near Earth Network, Space Network and Deep Space Network, Israel added. Both the Solar System Internet concept and DTN are part of NASA's Decade of Light initiative, through which the agency is developing and refining next-generation communications and navigation technologies for use in future science and exploration missions.
Exploration missions will use DTN to expand the network to the Moon, allowing communication between surface and orbiting elements and with Earth.
"We're really pushing to get DTN in use," Israel said.
"This is an important first step in that process."
Implanting diamonds with flaws offers key technology for quantum communications
Princeton NJ (SPX) Jul 19, 2018
Diamonds are prized for their purity, but their flaws might hold the key to a new type of highly secure communications. Princeton University researchers are using diamonds to help create a communication network that relies on a property of subatomic particles known as their quantum state. Researchers believe such quantum information networks would be extremely secure and could also allow new quantum computers to work together to complete problems that are currently unsolvable. But scientists curre ... read more
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