Record Details

Use of the Delay-Tolerant Networking Bundle Protocol from Space
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Author and Affiliation:
Wood, Lloyd(Cisco Systems, Global Government Solutions Group, United Kingdom);
Ivancic, William D.(NASA Glenn Research Center, Cleveland, OH, United States);
Eddy, Wesley M.(Verizon Federal Network Systems, Cleveland, OH, United States);
Stewart, Dave(Verizon Federal Network Systems, Cleveland, OH, United States);
Northam, James(Surrey Univ., Guildford, United Kingdom);
Jackson, Chris(Surrey Univ., Guildford, United Kingdom);
daSilvaCuriel, Alex(Surrey Univ., Guildford, United Kingdom)
Abstract: The Disaster Monitoring Constellation (DMC), constructed by Survey Satellite Technology Ltd (SSTL), is a multisatellite Earth-imaging low-Earth-orbit sensor network where captured image swaths are stored onboard each satellite and later downloaded from the satellite payloads to a ground station. Store-and-forward of images with capture and later download gives each satellite the characteristics of a node in a Delay/Disruption Tolerant Network (DTN). Originally developed for the Interplanetary Internet, DTNs are now under investigation in an Internet Research Task Force (IRTF) DTN research group (RG), which has developed a bundle architecture and protocol. The DMC is currently unique in its adoption of the Internet Protocol (IP) for its imaging payloads and for satellite command and control, based around reuse of commercial networking and link protocols. These satellites use of IP has enabled earlier experiments with the Cisco router in Low Earth Orbit (CLEO) onboard the constellation's UK-DMC satellite. Earth images are downloaded from the satellites using a custom IPbased high-speed transfer protocol developed by SSTL, Saratoga, which tolerates unusual link environments. Saratoga has been documented in the Internet Engineering Task Force (IETF) for wider adoption. We experiment with use of DTNRG bundle concepts onboard the UKDMC satellite, by examining how Saratoga can be used as a DTN convergence layer to carry the DTNRG Bundle Protocol, so that sensor images can be delivered to ground stations and beyond as bundles. This is the first successful use of the DTNRG Bundle Protocol in a space environment. We use our practical experience to examine the strengths and weaknesses of the Bundle Protocol for DTN use, paying attention to fragmentation, custody transfer, and reliability issues.
Publication Date: Apr 01, 2009
Document ID:
20090020378
(Acquired May 20, 2009)
Subject Category: COMPUTER SYSTEMS
Report/Patent Number: NASA/TM-2009-215582, IAC-08-B2.3.10, E-16810
Document Type: Technical Report
Meeting Information: 59th International Astronautical Congress and Exhibition 2008 (IAC); 29 Sep. - 3 Oct. 2008; Glasgow, Scotland; United Kingdom
Contract/Grant/Task Num: WBS 439432.04.19.01.01
Financial Sponsor: NASA Glenn Research Center; Cleveland, OH, United States
Organization Source: NASA Glenn Research Center; Cleveland, OH, United States
Description: 17p; In English; Original contains color and black and white illustrations
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Distribution as joint owner in the copyright
NASA Terms: PROTOCOL (COMPUTERS); COMPUTER NETWORKS; COMPUTER SECURITY; INTERNETS; ARCHITECTURE (COMPUTERS); AEROSPACE ENVIRONMENTS; COMMAND AND CONTROL; LOW EARTH ORBITS; UK SATELLITES; GROUND STATIONS; DATA LINKS
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