US PATENT SUBCLASS 342 / 420
.~.~.~ With error or deviatioan compensator or eliminator

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}
420.~.~.~ With error or deviatioan compensator or eliminator {1}
421  DF  .~.~.~.~> Pulse-type noise elimination or compensation (e.g., sky waves)

DEFINITION

Classification: 342/420

With error or deviation compensator or eliminator:

(under subclass 417) Subject matter including means which apply to the direction indication, a correction for known errors of the indication or for a desired deviation from the indication, or which are provided with means to eliminate or reduce the effects of unwanted signals or for deviations in the signal wave caused by disturbing influences.

(1) Note. This subclass contains patents for systems in which means are provided to compensate for or to eliminate the errors caused by metallic masses. Many of the systems in this subclass are designed for use on ships and airplanes where large metallic masses and other disturbing devices are located near the receiver. Included are systems where a screen is applied between the mass and the receiving antenna, and systems which include means so that the reading obtained is corrected for known errors. In the indented subclass are systems where the wave transmitted is in the form of pulses, the system being provided with means to eliminate or compensate for unwanted signal pulses, such as reflected sky waves.

SEE OR SEARCH THIS CLASS, SUBCLASS:

358, for satellite signal correction means.

SEE OR SEARCH CLASS

714, Error Detection/Correction and Fault Detection/Recovery, appropriate subclasses for electrical signal error correction/compensation, per se.