Methods And Systems For Multiple Input Multiple Output Synthetic Aperture Radar Ground Moving Target Indicator
First Claim
1. A multiple-input multiple-output (MIMO) radar system for monitoring motion of a movable target, comprising;
- at least two spatially offset transmitting antennas, wherein at least two distinguishable waveform signals are simultaneously transmitted;
a plurality of receiving antennas adapted to receive incoming waveform returns for each of said at least two distinguishable waveform signals;
a displaced phase center antenna processing unit operatively connected to said receiving antennas and adapted to process said incoming waveform returns for each of said at least two distinguishable waveform signals;
a synthetic aperture radar (SAR) processing unit operatively connected to said receiving antennas and adapted to produce from said incoming radar signals a plurality of spatially-coincident SAR-processed signals;
a processing circuit operatively connected to the SAR processing unit and the DPCA processing unit and adapted to generate a plurality of clutter-suppressed signals using the spatially-coincident SAR-processed signals.
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Accused Products
Abstract
A multiple-input multiple-output (MIMO) synthetic aperture radar (SAR) system. The radar system includes spatially offset transmitting antennas simultaneously transmitting at least two distinguishable waveform signals and receiving antennas receiving incoming waveform returns for each of the distinguishable waveform signals. The radar system also includes a displaced phase center antenna (DPCA) processing unit adapted to perform processing on the incoming waveform returns, and a synthetic aperture radar processing unit adapted to produce a plurality of spatially-coincident SAR-processed signals. The radar system also generates a plurality of clutter-suppressed signals using the spatially-coincident SAR-processed signals. For each of two MIMO transmissions from spatially displaced transmitters, clutter is cancelled simultaneously in at least two spatially displaced receive channels via DPCA processing. This results in at least two spatially displaced but simultaneous clutter cancelled complex SAR images, which are combined in a monopulse processor to enhance target detection and unambiguously determine target angle.
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Citations
17 Claims
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1. A multiple-input multiple-output (MIMO) radar system for monitoring motion of a movable target, comprising;
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at least two spatially offset transmitting antennas, wherein at least two distinguishable waveform signals are simultaneously transmitted; a plurality of receiving antennas adapted to receive incoming waveform returns for each of said at least two distinguishable waveform signals; a displaced phase center antenna processing unit operatively connected to said receiving antennas and adapted to process said incoming waveform returns for each of said at least two distinguishable waveform signals; a synthetic aperture radar (SAR) processing unit operatively connected to said receiving antennas and adapted to produce from said incoming radar signals a plurality of spatially-coincident SAR-processed signals; a processing circuit operatively connected to the SAR processing unit and the DPCA processing unit and adapted to generate a plurality of clutter-suppressed signals using the spatially-coincident SAR-processed signals. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A radar comprising;
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at least two spatially offset transmitting antennas, wherein at least two distinguishable waveform signals are simultaneously transmitted; a plurality of receiving antennas adapted to receive incoming waveform returns for each of said at least two distinguishable waveform signals; a processor operatively connected to said spatially offset transmitting antennas and said plurality of receiving antennas, the processor comprising; a displaced phase center antenna module adapted to process said incoming waveform returns for each of said at least two distinguishable waveform signals; a synthetic aperture radar (SAR) module adapted to produce from said incoming radar signals a plurality of spatially-coincident SAR-processed signals; wherein the processor is adapted to generate a plurality of clutter-suppressed signals using the spatially-coincident SAR-processed signals. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A non-transitory computer-readable storage medium storing computer-executable instructions for performing the following steps:
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receiving, from a plurality of receiving radar antennas, incoming waveform returns for each of said at least two distinguishable waveform signals; processing, using a displaced phase center antenna algorithm, the incoming waveform returns for each of said at least two distinguishable waveform signals; producing, from the incoming radar signals, a plurality of spatially-coincident SAR-processed signals; and generating a plurality of clutter-suppressed signals using the spatially-coincident SAR-processed signals. - View Dependent Claims (16, 17)
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Specification