Aircraft navigation through the United States and in many parts of the world today is based on guidance information supplied by very high frequency (VHF) omnidirectional range (VOR) facilities, usually in conjunction with colocated distance measuring equipment. The objectives of an improved VOR would be a system that would significantly reduce magnitude of siting errors, provide greater accuracy and use digital techniques to simplify processing. The wide-aperture digital VOR described has been developed to meet these objectives. Its design is based on the crossed-pair interferometer principle where eight such pairs are energized succcessively by a set of pulses and phase shifts. The time-multiplexed signal, detected by the aircraft receiver, is processed and simple digital computations are performed to determine the angular coordinates. The performance improvements have been achieved by the combination of using a 275-ft antenna aperture, and the use of digital techniques to generate the ground-radiated navigational signals and to process them in the airborne processor. Field tests of the feasibility model indicate it is a high performance system, capable of achieving an order of magnitude improvement in both site error reduction and in accuracy compared to present VOR systems. The measured accuracies were 0. 11-degree standard deviation.

  • Corporate Authors:

    Institute of Electrical and Electronics Engineers (IEEE)

    3 Park Avenue, 17th Floor
    New York, NY  United States  10016-5997
  • Authors:
    • Palatnick, A S
  • Publication Date: 1978-11

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Filing Info

  • Accession Number: 00194704
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Jun 13 1979 12:00AM