Device for numerically displaying VOR bearing

Details Device for numerically displaying VOR bearing Device for numerically displaying VOR bearing

1976-05-17

1978-02-14

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

324 83D, 328134, G01S 150

Patent

active

040742679

ABSTRACT:
A digital numeric VHF omnidirectional range (VOR) bearing indicator for piding a stable digital readout of VOR bearing in the presence of noise and fading signals. The device utilizes a count averaging scheme for calculating VOR bearing over a plurality of cycles. High quality filtering is also achieved by the use of phase lock loops which are used to generate low noise digital signals having a phase which matches reference and variation signals, representing VOR bearing. An exclusive "OR" gate is used to compare the reference and variation signals, after they are divided in frequency, to produce a composite signal which has a duration indicative of VOR bearing. The composite signal is then clocked, counted and averaged over a number of intervals and fed to a digital display device.

REFERENCES:
patent: 3386096 (1968-05-01), Lundgreen et al.
patent: 3919706 (1975-11-01), Grimm et al.

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