US PATENT SUBCLASS 342 / 410
.~.~.~.~ Glide slope 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}
410.~.~.~.~ Glide slope transmitter or receiver {2}
411  DF  .~.~.~.~.~> Receiver only
412  DF  .~.~.~.~.~> Transmitter oly

DEFINITION

Classification: 342/410

Glide slope transmitter or receiver:

(under subclass 407) Subject matter including means to transmit or receive bearing line or plane informating including the landing or take-off path of an aircraft where the glide slope is the vertical guidance portion of the path.

(1) Note. The glide slope antenna establishes a radiation pattern is space from which a signal is derived proportional to the vertical displacement from the glide path.

(2) Note. For example a modulated carrier signal by 90 and 150 Hz in a spatial pattern that allows the 90 Hz modulation to be detected above the glide path at an amplitude proportional to angular displacement from the path. Below the glide path, the 90 Hz signals radiated by the antenna are 1805 out of phase and subtract leaving the 150 Hz signal to be detected. Predominance of the 150 Hz signal causes a "fly up" indication in the cross-pointer meter off light direction; predominance of the 90 Hz signal causes a "fly down" signal.

SEE OR SEARCH CLASS

340, Communications: Electrical,

945+, for airport traffic control systems including landing guidance observable electrical signal indicators.