John D Garrison

US Patent:

40878155, May 2, 1978

Filed:

Apr 10, 1969

Appl. No.:

4/815535

Inventors:

John B. Garrison - Silver Spring MD
James L. Queen - Bethesda MD
David G. Grant - Laurel MD

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G01S 944

US Classification:

343 9

Abstract:

A hybrid digital-optical radar signal processor utilizing electro-optic ctals and having no moving parts. The processor is used with a radar having multiple discrete evenly spaced transmit frequencies, generated in a pattern, and is capable of simultaneously processing information relating to multiple targets. In the receiver section of the radar electro-optic crystals, such as Lithium Tantalate (LiTaO. sub. 3), act as optical phase shifters and are arranged in a data plane which is illuminated by a CW laser. Provision is made in digital delays and the optical phase shifters to provide flexibility in the selection of the pattern of frequency utilization during the transmit period. The optical output of the processor consists of an illumination pattern in a read-out plane with maximum intensity in said plane at positions corresponding to the velocity and fine range of each target.

US Patent:

41737601, Nov 6, 1979

Filed:

Jan 24, 1966

Appl. No.:

4/522789

Inventors:

John B. Garrison - Silver Spring MD

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G01S 504

US Classification:

343112R

Abstract:

The present invention provides a method and apparatus for effecting, in a ssive manner, the acquisitioning of a broadband barrage jammer type radar target, by detecting the differential delay between the barrage signal as received at a predetermined location over direct and indirect paths and producing a signal distinctly identifying the location of the jammer target relative to the receiving station. More specifically, the present invention includes means for generating reference pulses of varying frequency which are utilized in determining the phase relationship which exists between each of these reference pulses and the corresponding frequency component of the jammer signal as received over the direct path to the target. The jammer signal, as received over the indirect or delayed path, has each of its frequency components corresponding to the frequencies of the generated reference pulses adjusted so that the only phase difference then present between the indirectly received jammer signal components is due to the differential distance existing between the direct and indirect jammer signal paths to the receiving location. These adjusted components of the indirect jammer signal are then combined in such a manner as to produce an output signal which distinctly identifies the location of the jammer target.