Fred A Erickson

US Patent:

7050000, May 23, 2006

Filed:

Aug 19, 2003

Appl. No.:

10/643548

Inventors:

Garth Ernest Weals - Newbury Park CA, US
Yair Alon - Thousand Oaks CA, US
Fred William Erickson - Agoura Hills CA, US

Assignee:

Northrop Grumman Corporation - Los Angeles CA

International Classification:

G01S 7/02
G01S 7/40
G01S 13/00
G01S 13/74

US Classification:

342195, 342 42, 342 45, 342 82, 342165, 342173, 342174, 342175, 342194, 708270, 708271, 327105, 327107

Abstract:

An exemplary radar system includes a waveform generator that generates a control waveform. An in-phase and quadrature modulator receives the control waveform from the waveform generator and in turn generates a waveform output that is amplified by a power amplifier before being transmitted from an antenna.

US Patent:

40456838, Aug 30, 1977

Filed:

Oct 28, 1975

Appl. No.:

5/626251

Inventors:

Fred William Erickson - Woodland Hills CA

Assignee:

Litton Systems, Inc. - Beverly Hills CA

International Classification:

H02V 902

US Classification:

307157

Abstract:

A constant current drive circuit that can be driven directly from the output of a shift register which can find use, for example, in maintaining a constant current through a controlled device such as one or more light emitting diodes (LEDs) to ensure uniform brightness throughout a display surface that includes a plurality of LEDs.

US Patent:

40470490, Sep 6, 1977

Filed:

Oct 28, 1975

Appl. No.:

5/626250

Inventors:

Fred William Erickson - Woodland Hills CA
Roy Hiroshi Nakahara - Sun Valley CA

Assignee:

Litton Systems, Inc. - Beverly Hills CA

International Classification:

H02J 902

US Classification:

307157

Abstract:

A constant current drive circuit that can be driven directly from the output of a shift register which can find use, for example, as a constant current source for a light emitting diode (LED) to ensure uniform birghtness throughout a display surface that includes a plurality of LEDs.

US Patent:

60437758, Mar 28, 2000

Filed:

Nov 2, 1998

Appl. No.:

9/184810

Inventors:

Fred W. Erickson - Agoura Hills CA
Ray C. Pizzuti - Woodland Hills CA
John B. Rodwig - Woodland Hills CA

Assignee:

Litton Systems, Inc. - Woodland Hills CA

International Classification:

G01S 7298

US Classification:

342185

Abstract:

The Radar Scan Converter receives range and azimuth data that is generated by a conventional radar and presented in a polar coordinate system, and processes and displays this data, in real time, on a conventional generally rectangular display screen which has a display formed by a relatively large number of pixels organized in the X- and Y-axes of a Cartesian coordinate system. The Radar Scan Converter sequentially updates each pixel in the display by (1) selecting a pixel address in the Cartesian coordinate system, (2) determining the corresponding cell address in a direct display memory interface, (3) reading the video level in this corresponding cell, (4) then responsive to this respective video level, either initially loading or subsequently updating the associated pixel in a screen image memory, and (5) refreshing the display from the screen image memory through respective cycles over repeated radar scans. The Radar Scan Converter System displays shades of gray or color, which may represent one or more video levels. It also has an image decay capability over repeated radar scans through its preferred use of initially rotating video stored in the screen image memory and subsequently unrotating it by an increasing value during the display refresh cycles.

US Patent:

58671218, Feb 2, 1999

Filed:

Apr 17, 1997

Appl. No.:

8/843908

Inventors:

Fred W. Erickson - Agoura Hills CA
William F. Smith - Carlsbad CA

Assignee:

Litton Systems, Inc. - Woodland Hills CA

International Classification:

G01S 7298

US Classification:

342185

Abstract:

The Radar Scan Converter System (1) receives range and azimuth data generated by a conventional radar as presented in a polar coordinate system, (2) stores this data in associated cell locations in a range/azimuth polar video map, and (3) displays this polar coordinate range/azimuth data in a Cartesian coordinate system, in real time, on a conventional computer monitor having a rectangular display formed by a relatively large number of pixels organized in the Cartesian coordinate system. Each pixel in the display is sequentially update by (1) selecting a respective pixel address, (2) determining the corresponding range/azimuth cell address in the polar video map, (3) reading the video level in this corresponding range/azimuth cell, and (4) in response to this associated video level, either initially loading or subsequently updating the selected pixel. The radar scan converter system displays (1) shades of gray or color, which may represent one or more video levels, and (2) has an image decay capability over repeated radar scans which is particularly suited for display of a moving target.