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  • A RADAR altimeter must have 2 antennas (one transmit, one receive) so that it can operate continuously making altitude measurements by matching modulation and carrier phase of received signal with transmitted signal.
  • A weather RADAR needs only 1 antenna because it operates in a pulsed multiplex mode: the antenna is used as a transmitter antenna to send a short pulse of carrier, then is used as a receiver until the last possible reflection from the furthest distance could return. During this time the antenna has rotated only a tiny amount. The transmit/receive multiplex cycle continues as the antenna rotates 360 degrees.
  • A targeting RADAR operates much like the weather radar but it sweeps back and forth over a limited angle instead of in a full 360 degree circle. (e.g. 120 degrees, 90 degrees, 60 degrees, 45 degrees)
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14y ago

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