[Sls-slp] Re: [Cesg-all] [Ccsds-all] CCSDS PR - Special Delivery: NASA's MESSENGER Sends Flyby Data to Earth Using CFDP

Pen-Shu Yeh pen-shu.yeh-1 at nasa.gov
Thu Aug 11 17:44:01 UTC 2005

Please also note that the CCSDS.121.0-B-1 (Lossless Data Compression) was 
implemented on the MLA (Messenger Laser Altimeter) data in S/W by NASA's GSFC.

Pen-Shu Yeh
Data Compression WG Chair
At 02:04 PM 8/9/2005, Walz Penelope \(BTAS\) wrote:
>Dear CCSDS Community:
>Today CCSDS Public Affairs began dissemination of a press release entitled 
>“Special Delivery: NASA’s MESSENGER Sends Flyby Data to Earth Using CCSDS 
>File Delivery Protocol Developed for Deep Space by International Team” 
>through international newswire and to targeted media contacts 
>worldwide.  The release should be available to the general public 
>tomorrow, Aug. 10, but for your convenience, it is attached in .pdf format 
>and also appears below.
>Thanks to the following individuals for their input on this release:
>- Scott Burleigh, NASA JPL
>- Christopher Krupiarz, JHU APL
>- Kathy Rockwell, NASA JPL
>If you have any future CCSDS public affairs ideas, please feel free to 
>send them to me at <mailto:penelope.walz at btas.com>penelope.walz at btas.com .
>Thank you for your participation and support.
>Best regards,
>Penelope W. Walz
>The Consultative Committee for Space Data Systems
>CCSDS Secretariat Support – Public Affairs
>6301 Ivy Lane, Ste 720
>Greenbelt, MD 20770 USA
>Tel -      +1 301 474 5424
>Fax -     +1 301 474 5427
>Mobile (best contact) - +1 571 235 1625
>E-mail -   <mailto:penelope.walz at btas.com>penelope.walz at btas.com
>CCSDS Press Release
>Please hold until WED, August 10.
>Special Delivery: NASA’s MESSENGER Sends Flyby Data to Earth Using CCSDS 
>File Delivery Protocol Developed for Deep Space by International Team
>WASHINGTON, Aug. 10 (CCSDS) – NASA’s MESSENGER team is using the CCSDS 
>File Delivery Protocol (CFDP), a highly specialized protocol designed to 
>overcome space operations communications challenges, to download data 
>captured during a successful flyby of Earth last week.
>A team of international space data communications experts, collaborating 
>through the Consultative Committee for Space Data Systems (CCSDS), 
>developed CFDP to reliably and efficiently downlink files from a 
>spacecraft even in the strenuous environment of deep space.  Since the 
>MESSENGER spacecraft’s launch a year ago, it has successfully used CFDP to 
>enable mission communications and will use it throughout its 7.9-billion 
>kilometer journey to Mercury.
>In using CFDP, MESSENGER communications represents a change in the 
>standard method of storing science and housekeeping data on spacecraft 
>built by the Johns Hopkins University Applied Physics Laboratory 
>(JHU/APL).  MESSENGER is also the first U.S. space flight mission to use 
>CFDP in mission operations.
>Prior to MESSENGER, JHU/APL missions used a raw storage model of storing 
>data, but new mission and operational requirements meant that MESSENGER 
>would have to incorporate a file system of data storage into its 
>spacecraft software architecture.  A reliable method of downlinking files 
>to the ground had to be found and CFDP was chosen by mission planners to 
>do the job.
>CFDP is included in the MESSENGER software architecture through a reuse of 
>a NASA Jet Propulsion Lab (NASA JPL) implementation on the ground and a 
>JHU/APL “CFDP-lite” implementation on the flight side.  The NASA JPL 
>implementation is also used on NASA’s highly successful Deep Impact mission.
>“JHU/APL engineers integrated CFDP software developed by NASA JPL into the 
>MESSENGER mission's ground system, which communicates with a CFDP flight 
>software implementation developed by JHU/APL on the spacecraft,” said 
>Christopher Krupiarz, senior professional staff member, JHU/APL Space 
>Department Embedded Systems Group in Laurel, Maryland (USA).  “Being able 
>to use an international standard like CFDP was a key factor in getting two 
>systems developed by two different organizations to work for one Mercury 
>bound spacecraft.”
>CFDP is designed to function reliably despite the long data propagation 
>delays and frequent, lengthy interruptions in connectivity found in deep 
>space.  It uses powerful forward error correction coding that minimizes 
>data loss in communication across deep space, and also supports optional 
>“acknowledged” modes of operation in which data loss is automatically 
>detected and a retransmission of the lost data is automatically requested.
>Some of the world’s leading space communications experts working within 
>CCSDS collaborated at bi-annual working group sessions (similar to those 
>scheduled to take place next month in Atlanta, Georgia) to first 
>standardize CFDP.  They defined the protocol according to space file 
>transfer requirements articulated by CCSDS participating space agencies, 
>including NASA, the European Space Agency (ESA), the British National 
>Space Centre (BNSC), the Centre National d'Etudes Spatiales (CNES) and the 
>Japan Aerospace Exploration Agency (JAXA). The protocol’s ability to 
>maintain a high level of data transfer reliability even across 
>interplanetary distances makes it critical to successful communications on 
>deep space missions like the MESSENGER mission to Mercury and is expected 
>to have a high level of applicability to future Lunar exploration missions.
>CFDP also benefits space flight missions in another important way:  cost 
>CFDP allows an instrument to record an observation in a file and transmit 
>the file to Earth without having to consider whether or not physical 
>transmission is possible at that time. Sequestering outbound data 
>management and transmission planning functions within CFDP can simplify 
>flight and ground software, which reduces mission costs - an important 
>benefit to lower cost missions like MESSENGER.
>CCSDS will continue to foster global scale technical cooperation to 
>develop recommendations for space communication like CFDP that increase 
>interoperability, as well as reduce risk and mission operation 
>costs.  Currently, the organization is investigating extending the use of 
>CFDP in emerging delay-tolerant networking technology to Interplanetary 
>Internet operations, and specifically to the use of CFDP in complex 
>mission configurations, which should further enhance the usefulness and 
>value of CFDP to space exploration missions in the future.
>Scott Burleigh, CCSDS working group chair and lead CFDP system engineer at 
>NASA JPL in Pasadena, Calif. commented, “The successes of CFDP on 
>MESSENGER and the Deep Impact mission bring us closer to having an 
>automatic interplanetary communication fabric that can support deep space 
>science and exploration the way the Internet supports science on Earth."
># # #
>About CCSDS
>Established in 1982 by the world’s most influential space agencies, the 
>Consultative Committee for Space Data Systems (CCSDS) provides 
>well-engineered international space data handling standards that enhance 
>government and commercial interoperability and cross-support, while also 
>reducing risk, project cost and development time.
>             A pioneer in international cooperation in space, the CCSDS is 
> made up of leading space communications experts representing 28 
> countries, its founding member space agencies, 22 observer space agencies 
> and over 100 private companies.  CCSDS national member space agencies 
> include Japan, the United Kingdom, France, Germany, Italy, Brazil, 
> Russia, Canada and the United States, as well as the multi-national 
> European Space Agency.
>             To date, more than 300 missions to space have chosen to fly 
> with CCSDS protocols and the number continues to grow.  For more 
> information on participation or to access CCSDS standards and protocols 
> free of charge, please visit http://www.CCSDS.org.
>Contact for the Press:
>Penelope W. Walz
>CCSDS Public Affairs
>Tel 1 - +1 301 474 5424
>Tel 2 - +1 571 235 1625
>E-mail (best contact) – penelope.walz at btas.com
>CCSDS-All mailing list
>CCSDS-All at mailman.ccsds.org
>CESG-all mailing list
>CESG-all at mailman.ccsds.org

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