System and Method for Suppressing Sidelobes and Ghost Targets in SAR Images
AssigneeVrje Universitiet Brussel
InventorsAdnan Al baba, Andre Bourdoux
Life of this patent
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Abstract
The present disclosure relates to a computer implemented method for providing a SAR image with attenuated sidelobes and ghost targets caused by grating lobes, left-right ambiguity observed across the radar's boresight, or a combination thereof. The present disclosure further relates to a computer program product, a computer readable storage medium comprising instructions for performing the computer implemented method, and a SAR imaging system programmed for carrying out the computer implemented method.
Claims20
A computer implemented method comprising:
- obtaining, from a synthetic aperture radar, SAR, for imaging a region of interest within a field of view of the radar, at least two radar images, γ{circumflex over (n)}(x, y), of the region of interest acquired along a radar's trajectory, the radar images comprising range information and cross-range information;
- deriving, from the respective radar images, weight maps, W{circumflex over (n)}(x, y), by multiplying the range information normalized with respect to the cross-range information and the cross-range information normalized with respect to the range information;
- and
- combining the radar images, γ{circumflex over (n)}(x, y), by taking into account the derived weight maps, W{circumflex over (n)}(x, y), thereby obtaining a compensated radar image of the region of interest, {circumflex over (γ)}(x, y).
A SAR imaging system comprising:
- a synthetic aperture radar, SAR, configured to:
- obtain a region of interest within a field of view of the radar, at least two radar images, γ{circumflex over (n)}(x, y), of the region of interest acquired along a radar's trajectory, the radar images comprising range information and cross-range information;
- derive, from the respective radar images, weight maps, W{circumflex over (n)}(x, y), by multiplying the range information normalized with respect to the cross-range information and the cross-range information normalized with respect to the range information;
- and
- combine the radar images, γ{circumflex over (n)}(x, y), by taking into account the derived weight maps, W{circumflex over (n)}(x, y), thereby obtaining a compensated radar image of the region of interest, {circumflex over (γ)}(x, y).
A non-transitory computer readable storage medium having stored therein instructions executable by a processor, including instructions executable to:
- obtain a region of interest within a field of view of the radar, at least two radar images, γ{circumflex over (n)}(x, y), of the region of interest acquired along a radar's trajectory, the radar images comprising range information and cross-range information;
- derive, from the respective radar images, weight maps, W{circumflex over (n)}(x, y), by multiplying the range information normalized with respect to the cross-range information and the cross-range information normalized with respect to the range information;
- and
- combine the radar images, γ{circumflex over (n)}(x, y), by taking into account the derived weight maps, W{circumflex over (n)}(x, y), thereby obtaining a compensated radar image of the region of interest, {circumflex over (γ)}(x, y).
Dependencies are inferred from the claim text.