US PATENT SUBCLASS 342 / 418
.~.~.~ Doppler

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}
417  DF  .~.~ Direction-finding receiver only {14}
418.~.~.~ Doppler

DEFINITION

Classification: 342/418

Doppler:

(under subclass 417) Subject matter wherein the received signals have an apparent change in frequency due to the doppler effect.

(1) Note. Doppler effect is the observed change of the frequency of a wave caused by a time rate of change of the effective distance travelled by the wave between the source and the point of observation.