US PATENT SUBCLASS 342 / 34
.~ Ground control approach (GCA)

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

33  DF  AIRCRAFT LANDING SYSTEM {2}
34.~ Ground control approach (GCA)

DEFINITION

Classification: 342/34

Ground control approach (GCA):

(under subclass 33) Subject matter including a ground radar system providing information by which aircraft approaches to landing may be directed via radio communications.