例句與造句

1. On May 1, President Clinton announced that he was ending selective availability, bringing the accuracy of devices for users worldwide down to several feet.
2. The policy, called " selective availability, " is meant to keep enemies from enjoying the same precision in navigation and missile guidance that US forces can attain.
3. That limitation, known as " selective availability, " was put into the system to blur its accuracy if enemy forces tried to use the network to locate targets.
4. This " selective availability " feature makes the system accurate to only about 100 yards for civilian users, compared with about 20 yards or less for military users.
5. After " Selective Availability " was turned off by the U . S . government, the largest error in GPS was usually the unpredictable delay through the ionosphere.
6. It's difficult to find selective availability in a sentence. 用selective availability造句挺難的
7. "Any enemy of the United States sophisticated enough to operate GPS-guided weapons will be sophisticated enough to acquire and operate differential systems " that can overcome selective availability error.
8. The new ECCG contains a Height of Burst ( HOB ) sensor enabling air burst fusing options, and a SAASM ( Selective Availability Anti Spoofing Module ) compliant GPS receiver.
9. Selective Availability significantly impeded the U . S . military's own battlefield use of these GPS, so the military made the decision to turn it off for the duration of the war.
10. This changed with President Bill Clinton signing a policy directive in 1996 to turn off Selective Availability in May 2000 to provide the same precision to civilians that was afforded to the military.
11. It said that turning off selective availability, even for a three-year trial period as the report suggested, would be " a virtually irrevocable step " that would put the military at a disadvantage.
12. The sport only became possible in 2000, when then-President Bill Clinton's administration removed intentional distortion in the GPS signals called Selective Availability that made the civilian version less accurate than what the military uses.
13. After launching 24 satellites into worldwide orbit, the military gave itself an advantage over nonmilitary sectors and potential enemies through something called selective availability, which used encryption to warp system signals for the common user.
14. During the 1991 Gulf War, when a shortage of military GPS units led the military to issue off-the-shelf portable units from electronics stores to many soldiers, the Pentagon shut off selective availability for several months.
15. Thomas A . Herring, a Massachusetts Institute of Technology geophysics professor who teaches a class in GPS uses, said, " I have not heard a reasonable rationale for why selective availability is turned on continuously ."
16. But he grasped the fact that shutting off selective availability meant that " for the first time in the world, you could just be given coordinates and find a small object on the planet Earth ."
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