US PATENT SUBCLASS 342 / 395
.~.~.~.~ With hetrodyne synchronization

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}
395.~.~.~.~ With hetrodyne synchronization

DEFINITION

Classification: 342/395

With hetrodyne synchronization:

(under subclass 394) Subject matter including spaced transmitting stations which are not phase synchronized.

(1) Note. The transmitted signals are received by a fixed reference or link station and hetrodyned. The resulting beat frequency is transmitted to the mobile craft for phase comparison with a beat frequency developed in the craft from direct reception of the signals from the spaced transmitting stations.