×

High-resolution sidelobe-canceller auxiliary antennas

  • US 5,365,234 A
  • Filed: 03/23/1977
  • Issued: 11/15/1994
  • Est. Priority Date: 03/23/1977
  • Status: Expired due to Term
First Claim
Patent Images

1. In a communications receiver employing a directional main radar antenna and a sidelobe canceller system including an adaptive-loop canceller system for cancelling interference from the sidelobe signals of said main radar antenna, the improvement to said sidelobe canceller system which comprises:

  • directional auxiliary antenna means having multiple orthogonal directional beams the sum of which cover 360°

    in azimuth and multiple output ports each corresponding to a different one of said orthogonal directional beams, said directional auxiliary antenna means widely spaced from said main radar antenna for receiving interference signals and determining their angle of arrival;

    a plurality of auxiliary-antenna time-delay means each connected to a different one of said output ports for providing differently delayed signals to said adaptive-loop canceller system with the amount of time delay proportional to the angular position of the output port to which the time delay means is connected to; and

    main-antenna time-delay means connected between said main radar antenna and said adaptive-loop canceller for providing a delayed signal to said adaptive-loop canceller system.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×