342 / | HD | COMMUNICATIONS: DIRECTIVE RADIO WAVE SYSTEMS AND DEVICES (E.G., RADAR, RADIO NAVIGATION) |
118 | DF | DETERMINING DISTANCE {11} |
134 | DF | .~ With pulse modulation {4} |
139 | .~.~ Combined with determining direction {3} | |
140 | DF | .~.~.~> With azimuth and elevation determination |
141 | DF | .~.~.~> Off boresight |
142 | DF | .~.~.~> With CRT display {2} |