Point
7.00
Question Text
•1973: The GPS project initiated by the US Department of Defense exclusively for [1]
•1980s: opened for civil use
•1993: started working fully with [2]
•1990s: Selective Availability (SA) implemented for security reasons
•SA purposely restricted the [3] GPS signals for non-military use
•William Perry, US Secretary of Defence, demanded for the removal of the restriction to enhance [4]
•May 2 2000: use of SA [5]
•Consequently, the [6] accuracy improved remarkably from 330 to 66 feet
•September 2007: decided to upgrade to [7] , the future generation satellites
•Today, GPS is present in various technical products and mankind in various sectors
Quiz Section
Position
1.00
Question Type
Fill In Multiple Blanks
Master uuid
f78ec9a8-a8bd-4190-ac72-78800565e3b4
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military/ military purposes
Keywords: “1973” “initiated” “US Department of Defense” “exclusively”
Information: The GPS project was introduced in 1973 by the US Department of Defense for military purposes only.
Synonyms: initiate = introduce: khởi xướng, exclusively = only: duy nhất
24 satellites
Keywords: “1993” “working fully”
Information: It became fully functional in 1993 with 24 satellites
precision
Keywords: “SA” “purposely restricted” “GPS signals” “non-military use”
Information: Selective Availability was an intentional limitation of GPS signals implemented for national security reasons. It limited the precision of GPS signals for non-military users.
Synonyms: purposely = intentionally: có chủ đích, restriction = limitation: hạn chế
limited the precision of GPS signals for non-military users: hạn chế độ chính xác của tín hiệu GPS đối với người dùng phi quân sự.
civilian accuracy
Keywords: “William Perry” “demanded” “removal” “restriction” “enhance”
Information: William Perry, US Secretary of Defence, proposed to remove the restriction owing to the widespread growth of Global Positioning System services and intended to improve civilian accuracy.
discontinued
Keywords: “May 2 2000” “use”
Information: On May 2, 2000, by the order of President Bill Clinton, the US government discontinued the use of Selective Availability (SA)
positioning
Keywords: “accuracy improved remarkably from 330 to 66 feet”
Information: 2nd May was the first day when the non-military system discovered an improved positioning precision from 330 to 66 feet.
GPS III
Keywords: “September 2007” “upgrade” “future generation satellites”
Information: In September 2007, the US government decided to obtain the future generation of GPS satellites (GPS III).