F.M. RADAR RANGE SYSTEM

• US 3,710,387 A
• Filed: 09/06/1960
• Issued: 01/09/1973
• Est. Priority Date: 09/06/1960
• Status: Expired due to Term

• Current Assignee: Andrew W. Walters, Donald J. Adrian, Walter R. Hinchman
• Original Assignee: Andrew W. Walters, Donald J. Adrian, Walter R. Hinchman
• Inventors: Hinchman, Walter R., Adrian, Donald J., Walters, Andrew W.
• Primary Examiner(s): Hubler, Malcolm F.
• Application Number:
  US04/054,326
• Time in Patent Office: 4,508 Days
• Field of Search: 343/100.7,14,12
• US Class Current: 342/145
• CPC Class Codes: G01S 13/346 using noise modulation

Abstract

1. In a random modulated radar system utilizing carrier correlation the combination comprising a source of unmodulated radio frequency signal, a first modulator coupled to said signal source having an input and an output, a second modulator coupled to said signal source having an input and an output, noise generator means for generating a non-periodic signal directly coupled to the input of said first modulator for frequency modulating the signal coupled thereto with said non-periodic signal, antenna means coupled to the output of said first modulator for transmitting the non-periodic frequency modulated signal to a target, variable delay means coupling said noise generator to the input of said second modulator for frequency modulating the signal coupled thereto with a delayed non-periodic signal, mixer means having two inputs and an output, the output of said second modulator being coupled to one of the inputs of said mixer, antenna means for receiving a signal from said target being coupled to the other input of said mixer and doppler amplifier means coupled to the output of said mixer for producing a maximum output signal when there is unity correlation between the two inputs to said mixer.

Claims

1. In a random modulated radar system utilizing carrier correlation the combination comprising a source of unmodulated radio frequency signal, a first modulator coupled to said signal source having an input and an output, a second modulator coupled to said signal source having an input and an output, noise generator means for generating a non-periodic signal directly coupled to the input of said first modulator for frequency modulating the signal coupled thereto with said non-periodic signal, antenna means coupled to the output of said first modulator for transmitting the non-periodic frequency modulated signal to a target, variable delay means coupling said noise generator to the input of said second modulator for frequency modulating the signal coupled thereto with a delayed non-periodic signal, mixer means having two inputs and an output, the output of said second modulator being coupled to one of the inputs of said mixer, antenna means for receiving a signal from said target being coupled to the other input of said mixer and doppler amplifier means coupled to the output of said mixer for producing a maximum output signal when there is unity correlation between the two inputs to said mixer.

2. The system of claim 1 wherein said doppler amplifier means comprises first and second amplifiers each having their inputs coupled to the output of said mixer, and difference comparator means having the outputs of said amplifiers coupled as inputs thereto.

3. A radar system having oscillator means for generating a radio frequency signal, first modulator means coupled to said oscillator means for modulating said signal with a non-periodic signal, second modulator means coupled to said oscillator means for modulating said signal with a delayed non-periodic signal, transmitting means for transmitting said first modulated signal, receiving means for receiving an echo of said transmitted signal, and means coupled to said second modulating means and to said receiving means for generating a maximum output signal when the delay of said delayed modulated signal is equal to twice the transit time of said echo signal.