Analysis of AlternativesConclusions

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• The AoA supports the following general conclusions:

  • Local Area DGPS is most promising for fixed base, tactical, and special mission environments
  • LDGPS and upgraded Automatic Carrier Landing System+ is the most promising in the shipboard environment
  • Microwave Landing System is a low risk candidate to serve as a secondary or backup system
  • New Precision Approach Radar (PAR) and Hybrid ILS / PAR have potential as tactical backup systems
  • Civil Wide Area Augmentation Services have potential as a supplement to other systems in civil airspace
  • Enhanced Vision Systems may be useful as an augmentation to a precision landing system for low visibility operations

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