US PATENT SUBCLASS 342 / 117
.~ With plural beams (e.g., "Janus")

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

104  DF  DETERMINING VELOCITY {9}
117.~ With plural beams (e.g., "Janus")

DEFINITION

Classification: 342/117

With plural beams (e.g., "Janus"):

(under subclass 104) Subject matter including the use of two or more radar beams in making the velocity determination.

(1) Note. The "Janus"-type systems comprise two "back-to-back" antennas, respectively facing forward and rearward with nonoverlapping radiation patterns, each antenna serving to provide transmitting and receiving functions. The respective backscatter signal portions received by the antennas are added and subtracted to derive sum and difference signals from which the Doppler speed is determined.