×

Precise pulse repetition frequency measuring device and signal sorter

  • US 3,940,768 A
  • Filed: 01/07/1969
  • Issued: 02/24/1976
  • Est. Priority Date: 01/07/1969
  • Status: Expired due to Term
First Claim
Patent Images

1. An electronic signal processing device for performing precise real time measurement of the pulse repetition interval and frequency of pulse radar signals in a multi-signal environment, comprising:

  • input means for coupling to a radar receiver to receive said pulse radar signals therefrom;

    an automatic gating loop coupled to said input means, for receiving said pulse radar signals and separating said signals into discrete bands by pulse repetition interval and frequency;

    synchronizing pulse generating means having input means coupled to said automatic gating loop, for producing video synchronizing pulses at its output means in response to control signals from said automatic gating loop;

    a first video gating means having first and second input means and an output means, said first input means thereof being coupled to said automatic gating loop for receiving standard video pulses therefrom for each video pulse train within a selected one of said discrete bands, and said second input means thereof being for receiving enabling signals to control the passage of said standard video pulses from said first input means thereof to said output means thereof;

    a second video gating means having first and second input means and an output means, said first input means thereof being coupled to said input means for receiving said pulse radar signals from said radar receiver, and said second input means thereof being coupled in parallel with said second input means of said first gating means for receiving said enabling signals to control the passage of said pulse radar signals from said first input means thereof to said output means thereof;

    video gating signal generating means having input means coupled in parallel with said input means of said synchronizing pulse generating means to said automatic gating loop for receiving said control signals therefrom, and having output means switchably coupled to said second input means of each of said first and second video gating means, for producing said enabling signals at said output means thereof in response to said control signals from said automatic gating loop;

    adjustably linear delay means having input means coupled to said automatic gating loop for receiving said control signals therefrom, having manually adjustable control means for determining the length of delay to be introduced by said delay means between the receipt of said control signals and the production of corresponding output signals, and having output means for providing the delayed said corresponding output signals thereat;

    marker pulse generating means having input means coupled to said output means of said adjustable linear delay means for receiving said delayed corresponding output signals therefrom and producing a marker pulse of relatively short duration in response to each such signal, and having output means for providing said marker pulses thereat, said output means thereof being switchably coupled to said second input means of each of said first and second video gating means for providing said marker pulses as enabling signals thereto; and

    summing amplifier means having a first input means coupled to said output means of said synchronizing pulse generating means for receiving said video synchronizing pulses therefrom, a second input means coupled to said output means of said marker pulse generating means for receiving said marker pulses therefrom, and a third input means switchably coupled to the respective output means of said first and second video gating means for alternatively receiving said standard video pulses from said first video gating means and said unknown pulse radar signals from said second video gating means, and having output means for providing thereat a composite signal comprised of said synchronizing pulses, said video pulses, and said marker pulses for coupling to a pulse analyzing display means.

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