IEEE Trans Image Process - Bistatic synthetic aperture radar imaging using ultraNarrowband continuous waveforms.

Tópicos

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Resumo

We consider synthetic aperture radar (SAR) imaging using ultra-narrowband continuous waveforms (CW). Due to the high Doppler resolution of CW signals, we refer to this imaging modality as Doppler Synthetic Aperture Radar (DSAR). We present a novel model and an image formation method for the bistatic DSAR for arbitrary imaging geometries. Our bistatic DSAR model is formed by correlating the translated version of the received signal with a scaled or frequencyshifted version of the transmitted CW signal over a finite time window. High frequency analysis of the resulting model shows that the correlated signal is the projections of the scene reflectivity onto the bistatic iso-Doppler curves. We next use microlocal techniques to develop a filtered-backprojection (FBP) type image reconstruction method. The FBP inversion results in backprojection of the correlated signal onto the bistatic iso- Doppler curves as opposed to the bistatic iso-range curves, performed in the traditional wideband SAR imaging. We show that our method takes advantage of the velocity, as well as the acceleration of the antennas in certain directions to form a high resolution SAR image. Our bistatic DSAR imaging method is applicable for arbitrary flight trajectories, nonflat topography, and can accommodate system related parameters. We present resolution analysis and extensive numerical experiments to demonstrate the performance of our imaging method.

Resumo Limpo

consid synthet apertur radar sar imag use ultranarrowband continu waveform cw due high doppler resolut cw signal refer imag modal doppler synthet apertur radar dsar present novel model imag format method bistat dsar arbitrari imag geometri bistat dsar model form correl translat version receiv signal scale frequencyshift version transmit cw signal finit time window high frequenc analysi result model show correl signal project scene reflect onto bistat isodoppl curv next use microloc techniqu develop filteredbackproject fbp type imag reconstruct method fbp invers result backproject correl signal onto bistat iso doppler curv oppos bistat isorang curv perform tradit wideband sar imag show method take advantag veloc well acceler antenna certain direct form high resolut sar imag bistat dsar imag method applic arbitrari flight trajectori nonflat topographi can accommod system relat paramet present resolut analysi extens numer experi demonstr perform imag method

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