11.20.08
Working as part of a NASA-wide team, engineers from NASA's Jet Propulsion Laboratory in Pasadena, CA, used software called Disruption-Tolerant Networking, or DTN, to transmit dozens of space images to and from the Deep Impact spacecraft located about more than 20 million miles from Earth. The Deep Impact flyby spacecraft has been re-purposed since its encounter with comet Temple 1 in 2005 and is now on its way to comet Hartley 2 under the new name of the EPOXI mission.
"This is the first step in creating a totally new space communications capability, an interplanetary Internet," said Adrian Hooke, team lead and manager of space-networking architecture, technology and standards at NASA Headquarters in Washington.
NASA and Vint Cerf, a vice president at Google, Inc., in Mountain View, CA, partnered 10 years ago to develop this software protocol. The DTN sends information using a method that differs from the normal Internet's Transmission-Control Protocol/Internet Protocol, or TCP/IP communication suite, which Cerf co-designed.
The Interplanetary Internet must be robust enough to withstand delays, disruptions and disconnections in space. Glitches can happen when a spacecraft moves behind a planet, or when solar storms and long communication delays occur. The delay in sending or receiving data from Mars takes between three-and-a-half to 20 minutes at the speed of light.
Unlike TCP/IP on Earth, the DTN does not assume a continuous end-to-end connection. In its design, if a destination path can't be found, the data packets are not discarded. Instead, each network node keeps custody of the information as long as necessary until it can safely communicate with another node. This store-and-forward method, similar to basketball players safely passing the ball to the player nearest the basket, means that information does not get lost when no immediate path to the destination exists. Eventually, the information is delivered to the end user.
"In space today, an operations team has to manually schedule each link and generate all the commands to specify which data to send, when to send it, and where to send it," said Leigh Torgerson, manager of the DTN Experiment Operations Center at JPL. "With standardized DTN, this can all be done automatically."
Engineers began a month-long series of DTN demonstrations in October. Data were transmitted using NASA's Deep Space Network in demonstrations occurring twice a week. Engineers use the EPOXI spacecraft as a Mars data-relay orbiter. This month-long experiment is the first in a series of planned demonstrations to qualify the technology for use on a variety of upcoming space missions. In the next round of testing, a NASA-wide demonstration using new DTN software loaded on board the International Space Station is scheduled to begin next summer.
In the next few years, the Interplanetary Internet could enable many new types of space missions. Complex missions involving multiple landed, mobile and orbiting spacecraft will be far easier to support through the use of the Interplanetary Internet. It could also ensure reliable communications for astronauts on the surface of the moon.
The Deep Impact Networking Experiment is sponsored by the Space Communications and Navigation Office in NASA's Space Operations Mission Directorate in Washington. NASA's Science Mission Directorate and Discovery Program in Washington provided experimental access to the EPOXI spacecraft. The EPOXI mission team provided critical support throughout development and operations.
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