US PATENT SUBCLASS 342 / 394
.~.~.~ Iso-phase type

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.~.~.~ Iso-phase type {3}
395  DF  .~.~.~.~> With hetrodyne synchronization
396  DF  .~.~.~.~> Omega
397  DF  .~.~.~.~> Decca

DEFINITION

Classification: 342/394

Iso-phase type:

(under subclass 386) Subject matter wherein a distinctive signal or pulse in emitted by one radiating station and a similar signal or pulse (bearing a know, fixed phase relationship to the first signal or pulse) is emitted by a second remote radiating station, and wherein both are received and compared as to their phase relationship by a receiving station to provide a measure of the difference in distance between each radiating station and the receiving station, thereby enabling the fixing of the receiving station position along a known hyperbola or hyperboloid which are the loci of all points in space having a constant difference in distances to the radiating stations.