US PATENT SUBCLASS 342 / 405
.~.~.~.~.~ 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}
386  DF  .~.~ With transmisson of bearing or position determinative signals {6}
399  DF  .~.~.~ Tacan {2}
404  DF  .~.~.~.~ VOR {1}
405.~.~.~.~.~ Doppler {1}
406  DF  .~.~.~.~.~.~> With circular array of antennas

DEFINITION

Classification: 342/405

Doppler:

(under subclass 404) Subject matter wherein the variable signal has been developed by sequentially feeding a radio-frequency signal to a multiplicity of antennas and detecting the subsequent "Shift in the signal frequency" by the receiver.

(1) Note. The operation of feeding the signal sequentially to the antennas simulates the rotation of a single antenna.

(2) 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.