US PATENT SUBCLASS 342 / 396
.~.~.~.~ Omega

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}
394  DF  .~.~.~ Iso-phase type {3}
396.~.~.~.~ Omega

DEFINITION

Classification: 342/396

Omega:

(under subclass 394) Subject matter wherein hyperbolic lines of position are determined by measuring the changes in distances from the transmitters by counting radio-frequency wavelengths in space or lanes (iso-phase lines) as a vehicle moves from a known position, the lanes being counted by phase comparison with a stable oscillator aboard the vehicle.

(1) Note. Omega is a very-long-distance navigation system which operates at approximately 10 kilohertz usually transmitting signals in long bursts of continuous waves every 10 seconds.