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[jamsat-bb:5269] RE: [jamsat-bb:5267] GPS SA 解除！！！
山田さん、飯野です。確かにいままで車のカーナビの精度がいまいちだったのですが
本日から、精度が格段にあがりFM放送の補正情報を受信する必要がなくなりました。
FBです。
それでは。
-----Original Message-----
差出人 : Kohjin Yamada <kohjin@marina.prug.or.jp>
宛先 : jamsat-bb@jamsat.or.jp <jamsat-bb@jamsat.or.jp>
CC : yama@jarl.com <yama@jarl.com>; Akira Yamada <akira@osk.3web.ne.jp>
日時 : 2000年5月2日 18:17
件名 : [jamsat-bb:5267] GPS SA 解除！！！
>只今０９：００UTC報じられた通りGPSのSAが解除されました。
>（本日付け朝日新聞夕刊及び以下の資料をご覧下さい）
>
>今までSAがあった時には高度が数百メートルも上下していましたのが
>１メートル以内に収まっています。
>
>TAC32で見ています。
>
>山田 − JR1EDE
>
>=========================from tacgps=======================
>Date: Mon, 01 May 2000 16:18:38 +0000
>From: Dr Thomas A Clark <clark@tomcat.gsfc.nasa.gov>
>Organization: NASA/GSFC
>X-Mailer: Mozilla 4.72 [en] (Windows NT 5.0; U)
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>MIME-Version: 1.0
>To: TAPR APRS SIG <aprssig@lists.tapr.org>, AMSAT BB <amsat-bb@AMSAT.Org>
>Subject: GPS S/A To Be Turned Off
>Content-Type: text/plain; charset=us-ascii
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>Status:
>
>
>The White House released this press release today -- S/A est morte !
>
>
>---------------------------------------------------------------------
>
>
>[available at http://www.whitehouse.gov/library/PressReleases.cgi]
>
>
>
>May 1, 2000
>
>
>STATEMENT BY THE PRESIDENT REGARDING THE UNITED STATES' DECISION
>TO STOP DEGRADING GLOBAL POSITIONING SYSTEM ACCURACY
>
>
> THE WHITE HOUSE
>
>
> Office of the Press Secretary
>
>
> _______________________________________________________
>For Immediate Release May 1, 2000
>
>
>
> STATEMENT BY THE PRESIDENT REGARDING
> THE UNITED STATES' DECISION TO STOP DEGRADING
> GLOBAL POSITIONING SYSTEM ACCURACY
>
>
>
>Today, I am pleased to announce that the United States will stop the
>intentional degradation of the Global Positioning System (GPS) signals
>available to the public beginning at midnight tonight. We call this
>degradation feature Selective Availability (SA). This will mean that
>civilian users of GPS will be able to pinpoint locations up to ten times
>more accurately than they do now. GPS is a dual-use, satellite-based
>system that provides accurate location and timing data to users
>worldwide.
>My March 1996 Presidential Decision Directive included in the goals for
>GPS
>to: "encourage acceptance and integration of GPS into peaceful civil,
>commercial and scientific applications worldwide; and to encourage
>private
>sector investment in and use of U.S. GPS technologies and services." To
>meet these goals, I committed the U.S. to discontinuing the use of SA by
>2006 with an annual assessment of its continued use beginning this year.
>
>
>The decision to discontinue SA is the latest measure in an on-going
>effort
>to make GPS more responsive to civil and commercial users worldwide.
>Last
>year, Vice President Gore announced our plans to modernize GPS by adding
>two new civilian signals to enhance the civil and commercial service.
>This
>initiative is on-track and the budget further advances modernization by
>incorporating some of the new features on up to 18 additional satellites
>that are already awaiting launch or are in production. We will continue
>to
>provide all of these capabilities to worldwide users free of charge.
>
>
>My decision to discontinue SA was based upon a recommendation by the
>Secretary of Defense in coordination with the Departments of State,
>Transportation, Commerce, the Director of Central Intelligence, and
>other
>Executive Branch Departments and Agencies. They realized that worldwide
>transportation safety, scientific, and commercial interests could best
>be
>served by discontinuation of SA. Along with our commitment to enhance
>GPS
>for peaceful applications, my administration is committed to preserving
>fully the military utility of GPS. The decision to discontinue SA is
>coupled with our continuing efforts to upgrade the military utility of
>our
>systems that use GPS, and is supported by threat assessments which
>conclude
>that setting SA to zero at this time would have minimal impact on
>national
>security. Additionally, we have demonstrated the capability to
>selectively
>deny GPS signals on a regional basis when our national security is
>threatened. This regional approach to denying navigation services is
>consistent with the 1996 plan to discontinue the degradation of civil
>and
>commercial GPS service globally through the SA technique.
>
>
>Originally developed by the Department of Defense as a military system,
>GPS
>has become a global utility. It benefits users around the world in many
>different applications, including air, road, marine, and rail
>navigation,
>telecommunications, emergency response, oil exploration, mining, and
>many
>more. Civilian users will realize a dramatic improvement in GPS
>accuracy
>with the discontinuation of SA. For example, emergency teams responding
>to
>a cry for help can now determine what side of the highway they must
>respond
>to, thereby saving precious minutes. This increase in accuracy will
>allow
>new GPS applications to emerge and continue to enhance the lives of
>people
>around the world.
>----
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>