US PATENT SUBCLASS 342 / 128
.~ With frequency modulation

Current as of: June, 1999
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342 /   HD   COMMUNICATIONS: DIRECTIVE RADIO WAVE SYSTEMS AND DEVICES (E.G., RADAR, RADIO NAVIGATION)

118  DF  DETERMINING DISTANCE {11}
128.~ With frequency modulation {3}
129  DF  .~.~> Plural frequencies transmitted
130  DF  .~.~> Plural modulation {1}
133  DF  .~.~> Combined with determining direction

DEFINITION

Classification: 342/128

With frequency modulation:

(under subclass 118) Subject matter including determining distance by using a frequency modified radar carrier signal.

SEE OR SEARCH THIS CLASS, SUBCLASS:

122, for radar altitude determination with FM type altimeters.

200+, for frequency modulation radar circuitry, per se.