[FPSPACE] FW: [JAXA:0165] World's Fastest Satellite Internet Connection to 45 cm User Terminal Using "KIZUNA" (WINDS)

[LARRY KLAES]

>From: "JAXA Press Release Mail Service" <jaxapr at jaxa.jp>
>To: ljk4 at msn.com
>Subject: [JAXA:0165] World's Fastest Satellite Internet Connection to 45 cm 
>User  Terminal Using "KIZUNA" (WINDS)
>Date: Mon, 21 Apr 2008 18:59:38 +0900
>
>----------------------------------------------------------------------
>                        ***  JAXA MAIL SERVICE  ***
>                    Japan Aerospace Exploration Agency
>----------------------------------------------------------------------
>            World's Fastest Satellite Internet Connection to
>                       45 cm User Terminal Using
>               Wideband InterNetworking engineering test
>              and Demonstration Satellite "KIZUNA" (WINDS)
>
>                                                    April 8, 2008 (JST)
>                              Japan Aerospace Exploration Agency (JAXA)
>National Institute of Information and Communications Technology (NICT)
>
>The Japan Aerospace Exploration Agency (JAXA) and National Institute
>of Information and Communications Technology (NICT) performed a
>verification of regenerative switching functions between an ultra
>small-size user terminal (45 cm-diameter antenna) and a high-speed
>small ground station (1.2 m-diameter antenna) using the onboard
>multi-beam antenna*1 of "KIZUNA," and confirmed that Internet protocol
>(IP) communications with a transmission speed of 155 Mbps (155 Mega bit
>per second) were successfully performed. The verification was a part
>of the initial functional verification jointly conducted by JAXA and
>NICT between March 28 and April 7, 2008. It is especially noteworthy
>that the transmission speed of 155 Mbps from a satellite to an ultra
>small-size user terminal like the antenna of 45 cm in diameter is the
>fastest in the world.
>
>KIZUNA's operations entered the initial functional verification phase
>on March 1, and the functions and performance of its onboard equipment
>are currently being verified. The functions that have been verified so
>far include the automatic tracking control of the multi-beam antenna
>and the output of approximately 280 W from the multi-port amplifier.
>
>JAXA will further perform verification of KIZUNA's special features
>such as mutual connectivity across multiple ground stations,
>transmission at 1.2 Gbps (1.2 Giga bit per second), and the
>functionality of the active phased array antenna.
>
><Communication Outline>
>http://www.jaxa.jp/press/2008/04/20080408_kizuna_e.html#img1
>
><Explanation on the above figure>
>An ultra small-size user terminal with a 45 cm-diameter antenna was
>placed in Okinawa and a high-speed small ground station with a 1.2
>m-diameter antenna was placed in Tohoku. Data was sent from the 45 cm
>antenna to KIZUNA at a transmission speed of 1.5 Mbps, then sent from
>KIZUNA to the 1.2 m antenna at a speed of 155 Mbps. Data was also sent
>in reverse, from the 1.2 m antenna to KIZUNA at 155 Mbps and then from
>KIZUNA to the 45 cm antenna at 155 Mbps. Throughout these transmissions,
>KIZUNA was in the regenerative switching mode*2.
>
>*1 KIZUNA is equipped with two multi-beam antennas, one for Japan and
>neighboring countries and another for the Asia-Pacific region. The
>former covers Japan (nine areas total), Seoul, Beijing, and Shanghai.
>The latter covers seven cities in the Asia-Pacific region.
>
>*2 The regenerative switching mode is the mode in which data sent from
>a ground station to a satellite is demodulated in the satellite and
>sent to the destination ground station. The regenerative switch onboard
>the satellite is used for this process. Conventionally, data sent from a
>ground station had to be sent to another ground station to be processed
>and then sent from the satellite to the destination ground station. By
>equipping a regenerative switch similar to a ground station,
>communication can take place with less redirecting and therefore at
>greater speeds.
>
>
>Mission website:
>Wideband InterNetworking engineering test and Demonstration Satellite
>"KIZUNA"
>http://www.jaxa.jp/projects/sat/winds/index_e.html
>National Institute of Information and Communications Technology (NICT)
>http://www.nict.go.jp/index.html
>
>This page URL:
>http://www.jaxa.jp/press/2008/04/20080408_kizuna_e.html
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>Publisher : Public Affairs Department
>             Japan Aerospace Exploration Agency (JAXA)
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