Device for Numerically Displaying VOR Bearing.
DEPARTMENT OF THE NAVY WASHINGTON D C
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A digital numeric VHF omnidirectional range VOR bearing indicator for providing 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. Author
- Electrical and Electronic Equipment