System and method for bistatic sar image generation with phase compensation
AssigneeRaytheon Company
InventorDavid A. Faulkner
Life of this patent
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Abstract
A method and bistatic synthetic aperture radar (SAR) imaging system generate an image of a target area without knowledge of the position or velocity of the illuminator. The system includes an illuminator to illuminate a target area with a null-monopulse radiation pattern interleaved with a sum radiation pattern. The illuminator adjusts the phase terms of the sum radiation pattern to maintain a static electromagnetic field pattern at the target area. A receiver receives the radiation patterns reflected from the target area and generates phase compensation terms by correlating a measured electromagnetic vector field with the known static electromagnetic vector field. The phase compensation terms are used to generate an image of the target area.
Claims22
A bistatic synthetic aperture radar (SAR) imaging system comprising:
- an illuminator to illuminate a target area with a null-monopulse radiation pattern and a sum radiation pattern, wherein phase terms of the sum radiation pattern are adjusted to maintain a static electromagnetic vector field at the target area;
- and
- a receiver to receive the radiation patterns reflected from the target area, to generate phase compensation terms by correlating a measured electromagnetic vector field with the static electromagnetic vector field, and to generate an image of the target area using the phase compensation terms.
A method of generating a bistatic SAR image of a target area comprising:
- at a moving illuminator,
- illuminating a target area with a null-monopulse radiation pattern and a sum radiation pattern;
- and
- adjusting the phase terms of the sum radiation pattern to maintain a static electromagnetic vector field pattern at the target area,
- and at a receiver,
- generating phase compensation terms to adjust phase terms by correlating a measured electromagnetic vector field pattern with the static electromagnetic vector field pattern;
- and
- generating an image of the target area using the phase compensation terms.
A receiver for generating a bistatic synthetic aperture radar (SAR) image of a target area comprising:
- an antenna to receive radiation patterns reflected from the target area;
- and
- a processing element to generate phase compensation terms by correlating a measured electromagnetic vector field with a static electromagnetic vector field, and to generate an image of the target area using the phase compensation terms.
Dependencies are inferred from the claim text.