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Adaptive steerable null antenna processor with null indicator

  • US 5,107,273 A
  • Filed: 05/11/1981
  • Issued: 04/21/1992
  • Est. Priority Date: 05/11/1981
  • Status: Expired due to Fees
First Claim
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1. Null indication apparatus in a steerable null antenna processor system for receiving desired wave energy signals from at least one angular region of space within the area covered by the system and for suppressing interfering signals from a plurality of other angular regions comprising:

  • antenna means having at least three antenna elements and a common port;

    nulling means coupled between said antenna elements and said common port for supplying said desired wave energy signals to said common port, said nulling means including phase means and amplitude means, said phase means and amplitude means being adjustable and having control inputs operative in response to control signals to adjust the respective phase and amplitude values of said nulling means;

    digital controller means including clock means, sample storage means, comparison means, feedback input means, and phase and amplitude memory means coupled to said control inputs of the respective phase and amplitude means;

    feedback signal means between said common port and said feedback input means supplying feedback signals containing a representative level of the interfering signals at the common port, said clock means supplying clock signals to provide successive cycles, said comparison means being connected and operative during each cycle to compare a feedback signal from said feedback input means to a previous sample thereof stored in said sample storage means to indicate a change and to supply said control signals via said memory means to said nulling means to adjust the steering of a null to different interfering signals; and

    said null indication apparent further including display means, angle counter means, and a read only memory, said read only memory having outputs coupled to said control inputs of said nulling means and containing information for generating a cardioid pattern with a single null rotatable in fixed increments, said angle counter means having inputs coupled to said digital controller means and outputs coupled to said display means and to said read only memory, said digital controller means having a manually controllable direction finding mode to selectively vary said angle counter means output signals to steer said cardioid pattern via said read only memory to said nulling means and cause the angle of the null to be displayed by said display means.

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