US PATENT SUBCLASS 342 / 404
.~.~.~.~ VOR

Current as of: June, 1999
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342 /   HD   COMMUNICATIONS: DIRECTIVE RADIO WAVE SYSTEMS AND DEVICES (E.G., RADAR, RADIO NAVIGATION)

350  DF  DIRECTIVE {10}
385  DF  .~ Beacon or receiver {2}
386  DF  .~.~ With transmisson of bearing or position determinative signals {6}
399  DF  .~.~.~ Tacan {2}
404.~.~.~.~ VOR {1}
405  DF  .~.~.~.~.~> Doppler {1}

DEFINITION

Classification: 342/404

VOR:

(under subclass 398) Subject matter including means operating at VHF and providing radial lines of position in any direction as determined by comparing within the receiving equipment the phase of variably modulated beacon signal with that of a modulated nondirectional reference signal.

(1) Note. The variable signal has a phase relative to the reference signal which is different for watch bearing point of the receiver from the beacon station.