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- W2039426204 abstract "Doppler centroid is an important parameter in synthetic aperture radar (SAR) image processing. Owing to measurement uncertainties, many clutter-lock algorithms are proposed to estimate the Doppler centroid. One of the factors that affect the estimation is ‘chirp coupling’ [linear FM signal is used as transmitting signal in SAR, and this makes echoes of targets from different range bins overlap with each other at the same range bin, which could be called ‘chirp coupling (CHCO)’]. In broadside or lowly squint mode SAR, CHCO is often ignored. However, with large squint angle, its influence on Doppler centroid estimation will increase and even affect the final image. The azimuth-frequency shift of echoes caused by CHCO is analysed and a method proposed to calculate the threshold angle which is used to judge its influence on Doppler centroid estimation. With the help of the threshold angle, a novel strategy of Doppler centroid estimation is proposed. After theoretic analyses, simulations and experimental results are provided to demonstrate the proposed strategy of Doppler centroid estimation." @default.
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- W2039426204 date "2011-01-01" @default.
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- W2039426204 title "Strategy of Doppler centroid estimation in synthetic aperture radar" @default.
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- W2039426204 doi "https://doi.org/10.1049/iet-rsn.2010.0134" @default.
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