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 Title: |
US4538149:
Frequency agile magnetron imaging radar
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Wehner, Donald R.; San Diego, CA
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| Assignee: |
The United States of America as represented by the Secretary of the Navy, Washington, DC
other patents from UNITED STATES OF AMERICA, NAVY (597270) (approx. 13,239)
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| Published / Filed: |
1985-08-27
/ 1982-01-18
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| Application Number: |
US1982000339961
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| IPC Code: |
Advanced:
G01S 13/24;
G01S 13/89;
Core:
G01S 13/00;
IPC-7:
G01S 7/42;
G01S 13/89;
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| U.S. Class: |
Current:
342/194;
342/025.A;
342/201;
Original:
343/017.2R;
343/017;
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| Field of Search: |
343/5 AF,7.5,17.1 R,17.2 R,18 E,17
455/091,123,125
331/005,86,87,88,90,179
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| Priority Number: |
| 1982-01-18 |
US1982000339961 |
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| Abstract: |
A system is disclosed for utilizing frequency agile magnetron radars to porm one, two and three dimensional target imaging using coherent frequency agile radar waveforms. The pulses from a frequency agile magnetron are controlled so that their frequencies are approximately those of a highly coherent stepped frequency source. Means are provided for monitoring the magnetron's tuning piston position read-out voltage and for triggering the pulse forming network associated with the magnetron at the occurrence of each one of a set at a predetermined read-out voltage levels. A feedback loop is utilized to determine the difference between the frequencies of the actual output pulses of the magnetron and a set of precise, stepped reference frequencies. Correction values are generated and are utilized to generate a new set of magnetron read-out voltage levels at which the pulse forming network is to be triggered. The phase of the echo pulse is measured for each frequency step of each burst from the magnetron. The transmit and echo phase are obtained from the in-phase and quadrature samples produced by two sample gates. Subtraction of the transmit phase from the receive phase is carried out digitally by a digital mixer.
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| Attorney, Agent or Firm: |
Beers, Robert F. ;
Johnston, Ervin F. ;
Fendelman, Harvey ;
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| Primary / Asst. Examiners: |
Cangialosi, Salvatore; Barron, Jr., Gilberto
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| Maintenance Status: |
E2 Expired Check current status
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| INPADOC Legal Status: |
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| Family: |
None
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First Claim:
Show all 11 claims |
What is claimed is:
1. A signal generator comprising:
- a magnetron transmitter including a magnetron and having a read-out voltage terminal, said magnetron transmitter including a pulse forming network operably coupled to said magnetrons said magnetron further including an adjustable member for varying the output frequency of said magnetron, said magnetron transmitter further comprising a magnetron control driver and having a driving voltage terminal, said adjustable member being operably coupled to said driving voltage terminal and being responsive to a change in the voltage on said driving voltage terminal to change the magnetron output frequency; and
- control means operably coupled to said magnetron and to said pulse forming network for providing trigger signals to said pulse forming network in response to the voltage signal on said read-out voltage terminal, said control means further providing a periodically reoccurring voltage input to said driving voltage terminal, said control means providing one of said trigger signals to said pulse forming network each time the voltage level on said read-out voltage terminal reaches a different one of the voltage levels of a set of predetermined voltage levels.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 9 U.S. patent(s) that reference this one
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