US PATENT SUBCLASS 342 / 413-- .~.~.~.~ Localizer transmitter or receiver

US PATENT SUBCLASS 342 / 413
.~.~.~.~ Localizer transmitter or receiver

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}
407	DF	.~.~.~ Fixed course or bearing indicating {5}
413		.~.~.~.~ Localizer transmitter or receiver

DEFINITION

Classification: 342/413

Localizer transmitter or receiver:

(under subclass 407) Subject matter including transmission or reception of signals for the lateral guidance of aircraft with respect to the center line of a runway.

(1) Note. The localizer course is aligned with the projected runway center line. The carrier is modulated at 90 and 150 Hz in a spatial pattern that makes the 90 Hz modulation predominate when the aircraft is to the left of the course, with a difference in depth modulation proportional to the angular displacement from the course. The left-right cross-pointer meter or flight director show "fly right" when it receivers 90 Hz signals. To the right of the course the 90 Hz signals subtract, leaving the predominant 150 Hz signal proportional to the displacement from the course.