Superresolution Algorithms for Spatial Extended Scattering Centers

Felix Totir 1 Emanuel Radoi 2
Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance, UBO - Université de Brest
Abstract : Scattering centers model (SCM) is usually considered for modeling target backscattered signal in high-resolution radar. In this case the impulse response of each scattering center is represented by a time-delayed Dirac pulse. Some of most popular superresolution imagery techniques, such as MUSIC or ESPRIT, are well-matched to this model. Under this hypothesis, they outperform Fourier-based techniques in terms of both spatial and dynamic resolutions. However, the behavior of real-world targets is often very different from that of the SCM. Indeed, their reflectivity function is not confined just to several perfectly localized scattering centers, but it can be rather approximated by a set of scattering regions having different spatial extent. SCM becomes then inappropriate and the superresolution methods may provide unexpected results. Furthermore, the amplitude information is difficult to interpret in this case. In this paper we propose an extension of two superresolution methods, MUSIC and ESPRIT, to cope with extended scattering centers (ESC). According to this model, the impulse response of an ESC is not a Dirac pulse, but a window of finite support. Besides the position, the size (spatial extent) of this window is also recovered. This additional information about the target structure can be used for increasing ATR (automatic target recognition) accuracy and robustness.
Type de document :
Article dans une revue
Digital Signal Processing, Elsevier, 2009, 19, pp.780-792. 〈10.1016/j.dsp.2009.04.002〉
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Soumis le : mercredi 24 juin 2009 - 15:15:38
Dernière modification le : mardi 16 janvier 2018 - 15:54:25



Felix Totir, Emanuel Radoi. Superresolution Algorithms for Spatial Extended Scattering Centers. Digital Signal Processing, Elsevier, 2009, 19, pp.780-792. 〈10.1016/j.dsp.2009.04.002〉. 〈hal-00398606〉



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