System and method for processing squint mapped synthetic aperture radar data

• US 6,492,932 B1
• Filed: 06/13/2001
• Issued: 12/10/2002
• Est. Priority Date: 06/13/2001
• Status: Expired due to Term

• Current Assignee: Raytheon Company (Rtx Corporation)
• Original Assignee: Raytheon Company (Rtx Corporation)
• Inventors: Lawrence, Michael E., Jin, Michael Y.
• Primary Examiner(s): Sotomayor, John B.
• Application Number:
  US09/880,244
• Time in Patent Office: 545 Days
• Field of Search: 342/25, 342/89, 342/91, 342/99, 342/159, 342/160, 342/161, 342/162, 342/191, 342/192, 342/194, 342/195, 342/196
• US Class Current: 342/25.00R
• CPC Class Codes: G01S 13/9011 with frequency domain processing of the SAR signals in azimuth G01S13/9005 takes precedence
• CPC Class Codes: G01S 13/904 SAR modes
• CPC Class Codes: G01S 13/9041 Squint mode

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.

Claims

1. A system for processing squint-mapped synthetic aperture radar data comprising:

first means for effecting range compression of the data;

second means for effecting a coordinate transformation with respect to the data;

third means for performing a Fourier transform with respect to the transformed data;

fourth means for providing a range migration interpolation of the transformed data;

fifth means for removing phase variations in the range interpolated data;

sixth means for effecting a frequency remapping of the range interpolated data; and

seventh means for performing an inverse Fourier Transform with respect to the frequency remapped data.

2. The invention of claim 1 further including a two-dimensional spatial filter coupled to the output of the seventh means.

3. A method for processing squint-mapped synthetic aperture radar data including 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 frequency remapped data.

4. The invention of claim 3 further including the step of performing a two-dimensional spatial filter of the inverse transformed data.