Title: Movement Parameter Estimation and Scattering Centers Reconstruction of Extend Target Using Double-Dechirping
Abstract: The echo's mathematic model of movement target for wideband linear frequency modulated signal in STRETCH processing is deduced,which is demonstrated to be a muticomponent polynomial phase signals(mc-pps),The defect of processing mc-pps using time-frequency analysis and polynomial phase transform(PPT) are pointed out.And then,a new algorithm of estimation movement parameter and reconstruction scattering centers of extend radar target is proposed,which can avoid loss of energy and frequency resolution of auto-correlation by using double-dechirp.According to the characteristic of power spectrum,the proposed algorithm adopts power maxima criterion suppressing crossterms and improves performance of parameter estimation by using iterative algorithm.Furthermore,the ESPRIT algorithm supersedes FFT algorithm for improving estimation accuracy.Simulation results show that the proposed method can extract movement feature and reconstruct scattering centers effectively,even when SNR is low.
Publication Year: 2009
Publication Date: 2009-01-01
Language: en
Type: article
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