US PATENT SUBCLASS 342 / 387
.~.~.~ Iso-chronic 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}
387.~.~.~ Iso-chronic type {2}
388  DF  .~.~.~.~> Loran {2}
392  DF  .~.~.~.~> With automatic gain control

DEFINITION

Classification: 342/387

Iso-chronic type:

(under subclass 386) Subject matter wherein a distinctive signal or pulse, emitted by one radiating station, and a similar signal or pulse, emitted by a second remote radiating station and bearing a fixed time relationship to the first signal or pulse, are received by a navigation receiver and compared as to their time relationship.

(1) Note. The time difference in the signals is a measure of the difference in distances between the receiving station and each of the radiating stations thereby enabling the fixing of the position of the receiving station along a hyperbola or hyperboloid which are the loci of all points in

space having a constant difference in distance to the radiating stations. These loci are known as "iso-chromes".