Harry M Cronson

US Patent:

42912890, Sep 22, 1981

Filed:

Mar 17, 1980

Appl. No.:

6/130951

Inventors:

Basrur R. Rao - Lexington MA
Gerald F. Ross - Lexington MA
Harry M. Cronson - Lexington MA

Assignee:

Sperry Corporation - New York NY

International Classification:

H01P 130

US Classification:

333240

Abstract:

A surface wave transmission line enclosed in a dielectric shield and supported within the enclosure at a predetermined distance from the base of the enclosure. The enclosure being constructed such that the surface wave transmission line may be in close proximity to reflecting objects positioned along the enclosure and at a predetermined distance from a mounting structure.

US Patent:

46880410, Aug 18, 1987

Filed:

Oct 8, 1981

Appl. No.:

6/336642

Inventors:

Harry M. Cronson - Lexington MA
Gerald F. Ross - Lexington MA

Assignee:

Sperry Corporation - New York NY

International Classification:

G01S 736

US Classification:

342 17

Abstract:

A method and apparatus for detecting a short pulse signal in the presence of an interfering jamming signal wherein the jamming signal is utilized as the local oscillator in a diode mixer when it is received at a sufficiently high level for efficiently mixing with a short pulse signal. When the received jamming level is insufficient to act as a local oscillator, an internal local oscillator signal is coupled to the diode to maintain an efficient mixing operation.

US Patent:

41885953, Feb 12, 1980

Filed:

Aug 21, 1978

Appl. No.:

5/935238

Inventors:

Harry M. Cronson - Lexington MA
Basrur R. Rao - Lexington MA
Gerald F. Ross - Lexington MA

Assignee:

Sperry Corporation - New York NY

International Classification:

H01P 518
H01P 310
H04B 726

US Classification:

333113

Abstract:

A continuous, self-supporting microwave transmission line along which ultra short pulses of microwave signals may propagate over distances of several hundred feet with minimum pulse distortion and signal attenuation. Propagation along the line is accomplished by an electromagnetic field thereabout that is sensitive to objects positioned in the proximity of the transmission line, a characteristic that may be utilized in short pulse reflectometer systems for monitoring and control of vehicles on a prescribed course.

US Patent:

39834166, Sep 28, 1976

Filed:

Dec 30, 1974

Appl. No.:

5/537237

Inventors:

Harry M. Cronson - Lexington MA

Assignee:

Sperry Rand Corporation - New York NY

International Classification:

H03K 400
H03K 333

US Classification:

307260

Abstract:

A sequence of short pulses are produced from a single input pulse of longer duration by use of a plurality of step recovery diodes connected in shunt across a transmission line. The number of individual pulses produced in response to each applied longer pulse is determined by the number of step recovery diodes shunting the transmission line and the distance between adjacent pulses in the sequence is determined by the spacing between the diodes producing the adjacent pulses.

US Patent:

42544181, Mar 3, 1981

Filed:

Aug 23, 1978

Appl. No.:

5/936440

Inventors:

Harry M. Cronson - Lexington MA
Gerald F. Ross - Lexington MA
Basrur R. Rao - Lexington MA
Werner Lerchenmueller - Bellevue WA
Prentis B. Drew - Kirkland WA

Assignee:

Sperry Corporation - New York NY

International Classification:

G01S 302

US Classification:

343112CA

Abstract:

A collision avoidance system for rapid transit vehicles employing baseband radar principles in which signals with duration in the order of nanoseconds are transmitted down track along a surface wave transmission line. Reflections from a passive target located on the preceding vehicle are processed to establish the distance between the vehicles to within an accuracy previously unachievable.

US Patent:

42142482, Jul 22, 1980

Filed:

Jun 22, 1978

Appl. No.:

5/918182

Inventors:

Harry M. Cronson - Lexington MA
David Lamensdorf - Arlington MA
Gerald F. Ross - Lexington MA

Assignee:

Sperry Corporation - New York NY

International Classification:

H01Q 318
H01Q 1524

US Classification:

343756

Abstract:

A 360 degree fan beam scanning antenna which includes a transreflector created by a plurality of reflecting elements arranged on a surface of revolution formed about a generating axis and a feed antenna rotatable about the internal focal circle of the transreflector that provides an illumination beam for the transreflector which minimizes spillover and antenna pattern skewing.

US Patent:

46880429, Aug 18, 1987

Filed:

Oct 8, 1981

Appl. No.:

6/336643

Inventors:

Harry M. Cronson - Lexington MA
Richard M. Mara - Tewksbury MA

Assignee:

Sperry Corporation - New York NY

International Classification:

G01S 736

US Classification:

342 19

Abstract:

A short pulse radar receiver having a detector with a threshold automatically adjustable with the level of noise and interfering signals. Interfering signals at signal levels which exceed the maximum for which a threshold may be achieved to prevent a false alarm are attenuated prior to coupling to the variable threshold detector by an attenuator variable automatically in accordance with the received signal level.