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Application of maximum likelihood estimation to radar imaging

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3 Author(s)
Ming-Wang Tu ; ElectroSci. Lab., Ohio State Univ., Columbus, OH, USA ; Gupta, I.J. ; Walton, E.K.

An efficient maximum likelihood (ML) estimator to obtain the scattering center locations of a target and the relative scattering level of these scattering centers from the scattered field data is described. In the proposed method, ML estimation is carried out in the image domain rather than in the frequency-aspect domain. A two-dimensional (2-D) inverse Fourier transform is used to transfer the scattered field data from frequency-aspect domain to the image domain (down-range/cross-range). As expected, the scattered field data in the image domain has some regions with high energy. The samples in the high-energy regions are used to obtain the initial guess for the ML estimator as well as for ML estimation. The ML estimator in the image domain is applied to both simulated and experimental scattered fields of some targets

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:45 ,  Issue: 1 )

Date of Publication:

Jan 1997

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