DIGITAL PROGRAMMED TRANSMITTER

• US 3,702,476 A
• Filed: 03/18/1963
• Issued: 11/07/1972
• Est. Priority Date: 03/18/1963
• Status: Expired due to Term

• Current Assignee: David M. White, Fred E. Nathanson
• Original Assignee: David M. White, Fred E. Nathanson
• Inventors: Nathanson, Fred E., White, David M.
• Primary Examiner(s): Tubessing, T. H.
• Application Number:
  US04/266,112
• Time in Patent Office: 3,522 Days
• Field of Search: 343/17.1,17.2,5DP,17.1R,17.1PF,17.2R
• US Class Current: 342/195
• CPC Class Codes: G01S 13/222 using random or pseudorandom pulse repetition frequency
• CPC Class Codes: G01S 13/24 using frequency agility of carrier wave

Abstract

4. A radar transmitter for providing a coded pulse transmission comprising, A SIGNAL GENERATOR PROVIDING A PLURALITY OF PULSES, MEANS FOR PRODUCING A PSEUDO-RANDOM CODE, COUNTING MEANS CONNECTING TO SAID CODE MEANS OR PROVIDING CONTROL SIGNALS WHICH ARE SPACED IN ACCORDANCE WITH THE CODE GENERATED BY SAID CODE MEANS, AND DRIVING MEANS FOR TRANSMITTING THE OUTPUT PULSES FROM SAID SIGNAL GENERATOR IN RESPONSE TO SAID CONTROL SIGNALS, THEREBY PRODUCING A TRANSMISSION HAVING A VARIABLE PULSE REPETITION FREQUENCY.

Claims

1. A radar transmitter for providing a coded pulse transmission comprising, a coherent signal generator providing a plurality of pulses each at a different frequency, a feedback shift register for providing a pseudo-random code, and means for periodically transmitting one pulse from said generator at a frequency selected by the output of said feedback shift register such that the frequency of said transmitted signals varies from pulse to pulse in a pseudo-random manner.

2. A radar transmitter for providing a coded pulse transmission comprising, an antenna for radiating microwave energy, a pulse generator connected to said antenna for supplying energy pulSes thereto in response to a control signal, a crystal clock for providing uniformly spaced timing signals, a feedback shift register for providing a pseudo-random code, a variable time delay counter, means for transferring the state of said shift register into said counter in response to said clock signals, first control means for applying said timing signals to said counter after it has been set by said transfer means, and second control means for detecting an overflow state in said counter and for providing a control pulse in response thereto, said control pulse being applied to said pulse generator for control thereof.

3. A radar transmitter for providing a coded pulse transmission comprising, an antenna for radiating microwave energy, a signal generator providing a plurality of coherent pulses at different frequencies, switch means connected to said generator and said antenna for selecting and applying one of said pulses to said antenna in response to a control signal, a feedback shift register for providing a pseudo-random code, means for selecting the frequency of the pulse to be transmitted in response to the state of said shift register, a variable time delay counter, means for transferring the state of said shift register into said counter, a crystal clock for providing uniformly spaced timing signals, first control means for applying said timing signals to said counter after it has been set by said transfer means, and second control means for detecting an overflow state in said counter and for providing a control pulse in response thereto, said control pulse being applied to said coherent generator for control thereof.

5. A radar transmitter for producing a coded pulse transmission as defined in claim 4 wherein, said signal generator is a coherent signal generator providing a plurality of pulses at different coherent frequencies, and said driving means also selects the frequency of the pulses to be transmitted in response to said code generating means thereby producing a transmission in which the pulses vary in frequency from pulse to pulse.

6. A radar transmitter for providing a coded pulse transmission comprising, a feedback shift register providing a pseudo-random code, pulse generating means for producing a plurality of uniformly spaced pulses, counting means connected to said pulse generating means for producing timing signals, a variable time delay counter, means for applying the state of said shift register to said counter in response to said counting means, means for applying pulses from said pulse generating means to said counter after it is set by said shift register until an overflow pulse appears in the output of said counter, a signal generator providing a plurality of pulses at different frequencies, and means for transmitting a different frequency from said generator in response to each overflow pulse from said counter thereby providing a pulsed transmission having a variable pulse repetition rate.

7. A radar transmitter for providing a coded pulse transmission comprising, a feedback shift register providing a pseudo-random code, a crystal clock for producing a plurality of uniformly spaced pulses, a first binary counter connected to said crystal clock for counting said pulses and producing timing signals in response thereto, a second binary cOunter connected to said shift register, a plurality of transfer gates connected between said shift register and said second counter for applying the state of said shift register to said second counter in response to a timing signal from said first counter, a control gate connected to said clock and said second counter for applying clock pulses to said second counter in response to a timing signal from said first counter after said second counter has been set and until an overflow pulse is produced, a coherent signal generator providing a plurality of pulses at different coherent frequencies, and means for transmitting a different pulse from said generator in response to each overflow pulse from said second counter thereby providing a pulsed transmission having a variable pulse repetition rate.