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US 9,286,667 B2Granted
Method of eliminating spurious echoes in SAR imaging
AssigneeThales
InventorsNicolas Bon, Jean-Michel Quellec, Gabriel Marchalot
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Abstract
A method of eliminating spurious echoes in SAR imaging comprises a step Etp1 of defining the SAR imaging parameters, a step Etp2 of calculating the spectrum of the signal received, in each distance bin, of a zone of interest 51, a step Etp3 of filtering the spectra in each distance bin, a step Etp4 of SAR imagette 51 formation and a step Etp5 of concatenating the SAR imagettes 51 to form the final SAR image.
Claims2
A method of eliminating spurious echoes in Synthetic Aperture Radar (SAR) imaging, the method comprising:
- defining SAR imaging parameters,
- calculating spectrum of signal received, in each distance bin, of a zone of interest,
- locating a central frequency of fixed echoes backscattered by the zone of interest, the locating step further comprising:
- seeking a side where a slope is steepest on a curve of a measured spectrum,
- shifting a shape of a theoretical spectrum obtained based on characteristics of a radar antenna diagram on Doppler frequency axis to maximize a correlation between the theoretical and measured spectrum,
- seeking a frequency for which the theoretical spectrum is maximum,
- filtering spectra in each distance bin carried out by a bandpass filter centered on the central frequency of fixed echoes backscattered by the zone of interest,
- forming SAR sub images, and
- concatenating the SAR sub images to form a final SAR image.
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Dependencies are inferred from the claim text.