A Study of the Application of Differential Techniques to the Global Positioning System for a Helicopter Precision ApproachA Study of the Application of Differential Techniques to the Global Positioning System for a Helicopter Precision Approach
Athens, Ohio : Avionics Engineering Center, Dept of Electrical & Computer Engineering, Ohio University ; Moffett Field, Calif. : National Aeronautics and Space Administration Ames Research Center, [1984]
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