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The Global Positioning System A Shared National Asset (1995) / Chapter Skim
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Pages 204-212

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.


From page 204...
... For all of the above RAIM augmentations, availability ant! outage durations were calculated for routes between major city pairs for en route navigation and at representative terminal areas for nonprecision approach.
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From page 205...
... The results indicate that if selective availability is set to zero, RAIM availability and outage durations will be significantly improved. As shown in the Air Navigation Requirements Table in NRC report, the required availability for the FAA's Wide Area Augmentation System is 99.999 percent for GPS to be used as a primary navigation system in the en route and nonprecision approach phases of flight.
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From page 206...
... . | Upon the occurrence of a malfunctioning satellite with an abnormal range error, RAIM identification function RATM shall be able to detect the occurrence and also correctly identify the satellite before the protection limit is violated with a probability of 0.999.
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From page 207...
... New York to Los Angeles San Fransisco to Narita, lap en Dallas-Fort Worth to Paris User at a fixed location: Nonprecision approach Seattle (Protection limit= 0.3 nmi) Chicago Boston Los Angeles Dallas-Fort Worth Miami 207
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From page 209...
... 209 to ~ __ In _ ~ N -C\l _ 1 1 1 t !
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From page 210...
... As ~ said before, the reason for it is that barometric altimeter in a nonprecision approach (associated with 0.3 nmi protection limit) gives more accurate altitucle data with local barometer setting, and thus can provide higher improvement in availability.
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From page 211...
... ~ -ant ~711 ~ Ad- ~ ~1- ~ ~ ,2= 11 Hi I 3 E ~:~ :~ ~ i :~T or L ~ ~ .
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Key Terms

  • protection limit
  • precision approach
  • pseudorange measurements
  • gps satellite
  • barometric altimeter

  • range error
  • navigation requirements
  • percent probability
  • route navigation
  • approach phases


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