Multi-spot inverse synthetic aperture radar imaging
First Claim
1. A method of operating an inverse synthetic aperture radar (ISAR), the method comprising:
- transmitting a chirp signal into a dwell surveyed by the antenna beamwidth; and
generating multiple dechirp reference signals for use to demodulate return signals from the dwell at multiple selected intervals within a pulse repetition interval (PRI).
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Abstract
Providing multi-spot inverse synthetic aperture radar (ISAR) imagery is disclosed. Embodiments of techniques in accordance with the present disclosure may advantageously improve multiple target discrimination, detection, identification, and tracking using ISAR imaging. In an embodiment, an inverse synthetic aperture radar (ISAR) method for producing multiple ISAR images from a single waveform includes transmitting a chirp signal into a dwell surveyed by the antenna beamwidth. Multiple dechirp reference signals may be generated to demodulate return signals from the dwell at multiple selected intervals within a pulse repetition interval (PRI) to create demodulated signals.
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Citations
20 Claims
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1. A method of operating an inverse synthetic aperture radar (ISAR), the method comprising:
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transmitting a chirp signal into a dwell surveyed by the antenna beamwidth; and generating multiple dechirp reference signals for use to demodulate return signals from the dwell at multiple selected intervals within a pulse repetition interval (PRI). - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for producing multi-spot inverse synthetic aperture radar (ISAR) images from a single waveform without changing the chirp waveform or intermediate frequency bandwidth in the receiver, comprising:
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a receiver-exciter component for generating a transmit chirp and a plurality of copies of a dechirp reference signal with each pulse repetition interval (PRI), the dechirp signals associated with return signals from the transmit chirp; a plurality of receivers for independently receiving the return signals in an interval and performing stretch processing utilizing the dechirp reference signal; and a digitizer for each of the plurality of receivers, the digitizer operating at a selected interval and capturing an intermediate signal bandwidth. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. One or more computer-readable media storing computer executable instructions that, when executed by one or more processors, perform acts comprising:
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receiving return signals from a radar transmission, the return signals including information on multiple range intervals within a pulse repetition interval (PRI); dechirping the return signals using multiple dechirp reference signals; digitizing the dechirped return signals; and associating the digitized signals for each range interval using a block of pulse returns for at least one of a detection process or an ISAR imaging process. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification