Scalloping suppression system and method

Details Scalloping suppression system and method Scalloping suppression system and method

1975-03-24

1977-03-22

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 150

Patent

active

040140253

ABSTRACT:
A scalloping suppression system and method for use in a V.H.F. Omni Range (VOR) aircraft bearing determining system. The system is arranged to respond to changes in phase of the received radial which are due to position changes of the aircraft but not to respond to the generally more rapid changes in phase which are due to scalloping. A digital phase shifter-comparator network is employed to cause the phase of the reference signal to follow the phase of the variable phase signal. The phase shifter is comprised of two counters and the phase comparator is comprised of a bistable multivibrator. The delayed reference signal is the output of the system and an analog rate controller is employed to limit the rate at which the reference signal can follow the variable phase signal. The limiting is effected in proportion to DME distance which is inputted to the rate controller as an analog voltage.

REFERENCES:
patent: 3725933 (1973-04-01), Perkins et al.
patent: 3792473 (1974-02-01), Sawicki
patent: 3887921 (1975-06-01), Spratt et al.

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