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Cascaded adaptive loops

  • US 4,439,770 A
  • Filed: 06/23/1976
  • Issued: 03/27/1984
  • Est. Priority Date: 06/23/1976
  • Status: Expired due to Term
First Claim
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1. A sidelobe canceller system utilizing preprocessing to cancel multiple jamming interference signals, said system including a plurality of serially cascaded cancellation channels, said system comprising:

  • main-radar antenna means for receiving a radar signal;

    a plurality of auxiliary antenna means for receiving signals from a jamming interference environment, one of said auxiliary antenna means constituting a first auxiliary antenna means;

    a plurality of serially connected cancellation channels each said cancellation channel including;

    means for receiving and preprocessing the outputs of said plurality of auxiliary antenna means to decorrelate the outputs of said plurality of auxiliary antenna means;

    a plurality of serially connected main channel cancellers, the first main channel canceller of the first cancellation channel receiving the output of said first auxiliary antenna means and said main radar antenna and the first serial main channel canceller of the remaining cancellation channels receiving the outputs of said first auxiliary antenna means and the output of the last main channel canceller of the proceeding cancellation channel, the remainder of said main channel cancellers of each cancellation channel receiving decorrelated auxiliary antenna outputs from said means for receiving and processing; and

    a terminal cancellation channel including;

    terminal means for receiving and preprocessing the outputs of said plurality of auxiliary antenna means to decorrelate the outputs of said plurality of auxiliary antenna means;

    a plurality of serially connected, terminal main channel cancellers, the first serial terminal main channel canceller receiving the output of said first auxiliary antenna means and the output of the last main channel canceller of the last serial cancellation channel, the remainder of said terminal main channel cancellers receiving the auxiliary antenna outputs from said means for receiving and preprocessing; and

    a plurality of AGC means, each of which receives one of said auxiliary antenna outputs from said terminal means for receiving and preprocessing and provides an output to one of said terminal main channel cancellers.

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