Michael John Lawrence

US Patent:

6492932, Dec 10, 2002

Filed:

Jun 13, 2001

Appl. No.:

09/880244

Inventors:

Michael Y. Jin - Pasadena CA
Michael E. Lawrence - San Pedro CA

Assignee:

Raytheon Company - Lexington MA

International Classification:

G10S 1390

US Classification:

342 25, 342162, 342196, 342192

Abstract:

A method for processing squint-mapped synthetic aperture radar data of the present invention. The inventive method includes the steps of effecting range compression of the data; deskewing the data; performing a Fourier transform with respect to the deskewed data; providing a range migration interpolation of the transformed data; effecting a frequency remapping of the range interpolated data; and performing an inverse Fourier transform with respect to the deskewed data.

US Patent:

6987479, Jan 17, 2006

Filed:

Aug 17, 2004

Appl. No.:

10/919733

Inventors:

Charles T. Hansen - Palos Verdes Estates CA, US
Michael E. Lawrence - San Pedro CA, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

G01S 13/90

US Classification:

342 25F, 342 25 R, 342 25 A, 342175, 342176, 342179, 342190, 342191, 342195, 342196

Abstract:

Motion compensation for coherent combination of pulses facilitates a SAR image of a scene on earth's surface. A great circle () is centered with respect to the earth's center, The great circle () has an axis () perpendicular to a first plane. Axis () passes through the earth's center. The first plane contains great circle () and includes the earth's center. Great circle () has a first center defined by an intersection of the first plane and axis (). The scene has one or more radar scatterers and is located on a surface (). The radar system is mounted on a moving platform () moving with a component of motion in a direction along great circle (). The radar comprises a radar receiver for digitizing the radar returns having a phase from scatterers on surface (), and a computer for focusing the phase of said radar returns from the scatterers on surface (). The surface () is located on a local scene centerline circle (), the local scene centerline circle () defining a second plane. This second plane is parallel to the first plane.

US Patent:

7126524, Oct 24, 2006

Filed:

Aug 4, 2004

Appl. No.:

10/911438

Inventors:

Charles T. Hansen - Palos Verdes Estates CA, US
Michael E. Lawrence - San Pedro CA, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

G01S 13/90

US Classification:

342 25A, 342 25 F

Abstract:

A synthetic aperture image of a scene is acquired using a radar system. The scene has one or more radar scatterers located on a horizontal flat {circumflex over (x)},ŷ plane. The radar system is mounted on a moving platform moving at an angle θwith respect to the {circumflex over (x)},ŷ plane, with a component of motion in a perpendicular {circumflex over (z)} direction. The synthetic aperture image acquisition requires digitizing radar returns having a phase returned from scatterers in the scene, adjusting the phase of the radar returns in response to θto generate phase adjusted returns, then computing the synthetic aperture image from said phase adjusted returns. The phase adjustment takes into account θplatform motion with respect to the scene.