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US 12,111,394 B2Granted
Method and device for improved range tracking for inverse synthetic aperture radar
AssigneeKabushiki Kaisha Toshiba
InventorSeifallah Jardak
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Abstract
The present application presents various techniques for improving the performance of range tracking motion compensation method for high resolution radar imaging. Three improved techniques are described herein: improved cross-correlation alignment through updates to the reference range profile to follow the target's changing illumination angle; improved cross-correlation alignment through local peak boosting; and, improved polynomial smoothing through subdivision into multiple windows.
Claims18
A computer implemented method comprising:
- obtaining a plurality of range profiles each representing a plurality of return measurements from a corresponding pulse;
- selecting one or more sets of range profiles from the plurality of range profiles;
- for a selected set of range profiles, selecting a reference range profile from the plurality of range profiles;
- for a selected reference range profile, applying motion compensation to a corresponding set of range profiles based on the reference range profile, wherein applying motion compensation comprises:
- for a range profile of the selected set of range profiles in the corresponding set of range profiles, correlating the range profile with the reference range profile to produce a corresponding correlation distribution;
- determining for a first correlation distribution of the correlation distributions a range shift corresponding to a maximum correlation in the correlation distribution, the maximum correlation indicating correlation values that are within a predefined threshold of a peak value in the correlation distribution;
- for a subsequent correlation distribution from the correlation distributions:
- determining a region of range shifts around a determined range shift corresponding to a maximum correlation of a previous correlation distribution;
- increasing correlation values for the correlation distribution across the region of range shifts to produce a boosted correlation distribution;
- and
- determining a range shift corresponding to a maximum correlation in the boosted correlation distribution;
- adjusting the range profile to compensate for the range shift corresponding to the maximum correlation;
- and
- outputting the adjusted range profile to an inverse synthetic aperture radar to determine a feature of a target.
11 more elements
A non-transitory machine-readable storage medium storing instructions which, when executed, cause a processing device to perform a method including:
- obtaining a plurality of range profiles each representing a plurality of return measurements from a corresponding pulse;
- selecting one or more sets of range profiles from the plurality of range profiles;
- for a selected set of range profiles, selecting a reference range profile from the plurality of range profiles;
- for a selected reference range profile, applying motion compensation to a corresponding set of range profiles based on the reference range profile, wherein applying motion compensation comprises:
- for a range profile of the selected set of range profiles in the corresponding set of range profiles, correlating the range profile with the reference range profile to produce a corresponding correlation distribution;
- determining for a first correlation distribution of the correlation distributions a range shift corresponding to a maximum correlation in the correlation distribution, the maximum correlation indicating correlation values that are within a predefined threshold of a peak value in the correlation distribution;
- for a subsequent correlation distribution from the correlation distributions:
- determining a region of range shifts around a determined range shift corresponding to a maximum correlation of a previous correlation distribution;
- increasing correlation values for the correlation distribution across the region of range shifts to produce a boosted correlation distribution;
- and
- determining a range shift corresponding to a maximum correlation in the boosted correlation distribution;
- adjusting the range profile to compensate for the range shift corresponding to the maximum correlation;
- and
- outputting the adjusted range profile to an inverse synthetic aperture radar to determine a feature of a target.
11 more elements
A system comprising:
- a memory;
- and
- a processing device, operatively coupled with the memory, to:
- obtain a plurality of range profiles each representing a plurality of return measurements from a corresponding pulse;
- select one or more sets of range profiles from the plurality of range profiles;
- for a selected set of range profiles, select a reference range profile from the plurality of range profiles;
- for a selected reference range profile, apply motion compensation to a corresponding set of range profiles based on the reference range profile, wherein applying motion compensation comprises:
- for a range profile of the selected set of range profiles in the corresponding set of range profiles, correlate the range profile with the reference range profile to produce a corresponding correlation distribution;
- determine for a first correlation distribution of the correlation distributions a range shift corresponding to a maximum correlation in the correlation distribution, the maximum correlation indicating correlation values that are within a predefined threshold of a peak value in the correlation distribution;
- for a subsequent correlation distribution from the correlation distributions:
- determine a region of range shifts around a determined range shift corresponding to a maximum correlation of a previous correlation distribution;
- increase correlation values for the correlation distribution across the region of range shifts to produce a boosted correlation distribution;
- and
- determine a range shift corresponding to a maximum correlation in the boosted correlation distribution;
- adjust the range profile to compensate for the range shift corresponding to the maximum correlation;
- and
- output the adjusted range profile to an inverse synthetic aperture radar to determine a feature of a target.
14 more elements
Dependencies are inferred from the claim text.