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Secondary surveillance radar

  • US 5,920,277 A
  • Filed: 02/09/1998
  • Issued: 07/06/1999
  • Est. Priority Date: 05/11/1995
  • Status: Expired due to Term
First Claim
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1. A secondary surveillance radar including:

  • a transmitter to transmit radar signals that interrogate transponders on remote targets;

    a receiver to receive returns from the interrogated transponders on the targets; and

    a controllable power source to produce r.f. signals for the transmitter, comprising circuitry to produce first and second r.f. signals having a predetermined phase relationship;

    a phase setter that sets the phase relationship between first and second signals selectively;

    first and second power amplifiers to amplify the first and second signals respectively; and

    a power combiner to combine the first and second signals amplified by the amplifiers whereby to provide an amplified r.f. output signal of a power dependent upon the phase relationship set by the phase setter.

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