DOA Estimation of Wideband Linear Frequency Modulated Pulse Signals Based on Fractional Fourier Transform

doi:10.3969/j.issn.1000-1093.2014.03.020

Abstract

Abstract: A new method for a center frequency estimation based on fractional Fourier transform (FRFT) is proposed for the case that the time width of wideband linear frequency modulated pulse signals is not equal to the width of observation time. The MUSIC algorithm for direction of arrival (DOA) estimation in the fractional Fourier domain is improved. Based on the energy-concentrated properties of linear frequency modulated signal in the fractional Fourier domain, the proposed approach is used to analyze the change of center frequency with the position variation of pulse signal in observation time. And the array manifold vector of fractional Fourier domain is constructed using the MUSIC algorithm for DOA estimation. Numerical simulation shows the effectiveness of the algorithm for DOA estimation. Then the influence of the SNR and time width in observation time on DOA estimated results is analyzed.

Key words: information processing, fractional Fourier transform, direction of arrival estimation, wideband linear frequency modulated pulse signal, center frequency, pulse signal

CLC Number:

TN911.7

WANG Rui, MA Yan. DOA Estimation of Wideband Linear Frequency Modulated Pulse Signals Based on Fractional Fourier Transform[J]. Acta Armamentarii, 2014, 35(3): 421-427.

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