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Anti-jam communications system

  • US 4,231,113 A
  • Filed: 03/11/1968
  • Issued: 10/28/1980
  • Est. Priority Date: 03/11/1968
  • Status: Expired due to Term
First Claim
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1. In an anti-jam communications system wherein binary message signal representations are to be transmitted, the combination comprising:

  • a source for producing an oscillating electrical signal;

    a source of binary message bits;

    a source of pseudo-random signals for producing a pseudo-random sequence of bits, each bit 1/N the length of said binary message bit where N is greater than one;

    a modulo-two adder responsive to said binary message bits and said pseudo-random sequence of bits for producing a pseudo-random sequence of bits modified by said binary message bits;

    digital to analog conversion means responsive to said modified pseudo-random sequence of bits for producing a pseudo-randomly varying series of analog values; and

    means responsive to said analog values for varying the oscillating electrical signal in accordance with said analog values.

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