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The direction of arrival (DOA) estimation is a key issue in array signal processing, and there are many well-known methods, e.g., Capon, MUSIC, Root-MUSIC and some other DOA estimation algorithms in the literature. Nevertheless, the effective DOA estimation for closely spaced multiple sources with large power differences is still a difficult problem due to the deteriorated resolution for the low power...
In this paper, a stagewise approach has been adopted in the Direction of Arrival (DOA) estimation procedure to improve the speed and efficiency of the whole estimation, i.e. a coarse estimation is firstly carried out by means of Minimum Variance Distortionless Response (MVDR) to provide a smaller searching angle for the secondary high precision estimator, which is realized by a modified Orthogonal...
Estimation of Doppler centroid and Doppler rate is important for spaceborne synthetic aperture radar system. An improved method for Doppler parameters' estimation based on special mode of ScanSAR is presented in this paper. Differing from the traditional estimating method, Doppler centroid and Doppler rate are estimated in same process using fractional Fourier transform. It has less computing complexity...
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