Methods for two-dimensional autofocus in high resolution radar systems

US7843377B2 · kind B2 · utility

Assignee

• General Dynamics Advanced Information Systems, Inc. · US

Inventors

• Scott D. Connell · Pinckney, US
• Edward F. Gabl · Saline, US
• Mark A. Ricoy · Ann Arbor, US
• Elizabeth T. Batteh · Ann Arbor, US
• Ron Goodman · Novi, US

Key dates

• Filing date: Feb 12, 2010
• Grant date: Nov 30, 2010
• Expiry date: Feb 12, 2030

Classification

• Technology area (CPC G): Physics
• CPC primary: G01S13/9019
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Provided are two-dimensional autofocus methods in a synthetic aperture radar (SAR) system which include: (1) two-dimensional pulse pair product algorithm including shear PGA, eigenvector phase history (“EPH”), shear PGA/EPH); (2) two-dimensional optimization algorithms including parametric one-dimensional estimate/two-dimensional correction, parametric two dimensional estimate/two-dimensional correction, unconstrained two-dimensional nonparametric and constrained two-dimensional nonparametric methods; (3) a two-dimensional geometry filter algorithm; (4) a two-dimensional prominent point processing algorithm; (5) a one-dimensional phase estimate of higher order two dimensional phase errors; and, (6) a fast SHARP parametric autofocus algorithm.