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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.<br><br>
<br>
Pen-Shu Yeh<br>
Data Compression WG Chair<br>
At 02:04 PM 8/9/2005, Walz Penelope \(BTAS\) wrote:<br>
<blockquote type=cite class=cite cite=""><font face="tahoma" size=2 color="#000080">Dear
CCSDS Community:<br>
<br>
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. <br>
<br>
</font><br>
<font face="tahoma" size=2 color="#000080">Thanks to the following
individuals for their input on this release:<br>
</font><br>
<font face="tahoma" size=2 color="#000080"> <br>
</font><br>
<font face="tahoma" size=2 color="#000080">- Scott Burleigh, NASA
JPL<br>
</font><br>
<font face="tahoma" size=2 color="#000080">- Christopher Krupiarz, JHU
APL<br>
</font><br>
<font face="tahoma" size=2 color="#000080">- Kathy Rockwell, NASA
JPL<br>
</font><br>
<font face="tahoma" size=2 color="#000080"> <br>
If you have any future CCSDS public affairs ideas, please feel free to
send them to me at
<a href="mailto:penelope.walz@btas.com">penelope.walz@btas.com</a>
. <br>
<br>
Thank you for your participation and support. <br>
<br>
Best regards,<br>
Penelope W. Walz<br>
The Consultative Committee for Space Data Systems<br>
CCSDS Secretariat Support – Public Affairs<br>
6301 Ivy Lane, Ste 720<br>
Greenbelt, MD 20770 USA<br>
Tel - +1 301 474 5424<br>
Fax - +1 301 474 5427<br>
Mobile (best contact) - +1 571 235 1625<br>
E-mail - <a href="mailto:penelope.walz@btas.com">penelope.walz@btas.com</a><br>
<br>
<br>
</font><br>
<font face="arial" size=2><b>CCSDS Press Release<br>
</b></font><br>
<font face="arial" size=2><b>Please hold until WED, August 10.<br>
</b></font><br>
<div align="center"><font face="arial" size=2><b> <br>
</b></font></div>
<br>
<div align="center"><font face="arial" size=2><b>Special Delivery: NASA’s MESSENGER Sends Flyby Data to Earth Using CCSDS File Delivery Protocol Developed for Deep Space by International Team<br>
</b></font></div>
<br>
<font face="arial" size=2> <br>
</font><br>
<font face="arial" size=2>WASHINGTON</font>, 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. <br>
<br>
<font face="arial" size=2>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. <br>
</font><br>
<font face="arial" size=2>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.<br>
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. <br>
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.<br>
<b>“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, </b>senior professional staff member, JHU/APL Space Department Embedded Systems Group in Laurel, Maryland (USA). <b>“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.”<br>
</b>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. <br>
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.<br>
CFDP also benefits space flight missions in another important way: cost savings. <br>
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. <br>
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.<br>
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."<br>
<br>
<div align="center"># # #<br>
</div>
<b><u> <br>
About CCSDS <br>
</u></b>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.<br>
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. <br>
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 <a href="http://www.ccsds.org/" eudora="autourl">http://www.CCSDS.org</a>. <br>
<br>
<br>
<b>Contact for the Press:<br>
</b>Penelope W. Walz<br>
CCSDS Public Affairs<br>
Tel 1 - +1 301 474 5424<br>
Tel 2 - +1 571 235 1625<br>
E-mail (best contact) – penelope.walz@btas.com<br>
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