DOA Estimation of Coherent Wideband LFM Signals Based on Fractional Fourier Transform

Author

Qu, Haitao ; Qi, Lin ; Mu, Xiaomin ; Yang, Shouyi

Author_Institution

Inf. Eng. Sch., Zhengzhou Univ.

Volume

3

fYear

2006

fDate

Aug. 30 2006-Sept. 1 2006

Firstpage

18

Lastpage

21

Abstract

Referring to the coherent wideband linear frequency modulation (LFM) signals, direction of arrival (DOA) estimation based on fractional Fourier transform (FRFT) is proposed. In this method, the observed signals are first transformed to fractional Fourier (FRF) domain, using the superior time-frequency localization, time-variant direction matrix is changed into time-invariant one. By dint of the forward/backward (FB) spatial smoothing techniques, the corresponding correlation matrix is constructed. Then the DOA of multicomponent coherent wideband LFM signals can be estimated by the traditional MUSIC algorithm simultaneously. Simulation verifies the effectiveness of the novel method

Keywords

Fourier transforms; correlation theory; direction-of-arrival estimation; frequency modulation; matrix algebra; smoothing methods; LFM; MUSIC algorithm; correlation matrix; direction matrix; direction-of-arrival estimation; forward-backward spatial smoothing technique; fractional Fourier domain; fractional Fourier transform; multicomponent coherent wideband linear frequency modulation signal; superior time-frequency localization; Additive noise; Delay; Direction of arrival estimation; Fourier transforms; Sensor arrays; Signal analysis; Signal processing algorithms; Smoothing methods; Time frequency analysis; Wideband; DOA.... forward/backward spatial smoothing; LFM; fractional Fourier transform; signal;

fLanguage

English

Publisher

ieee

Conference_Titel

Innovative Computing, Information and Control, 2006. ICICIC '06. First International Conference on

Conference_Location

Beijing

Print_ISBN

0-7695-2616-0

Type

conf

DOI

10.1109/ICICIC.2006.440

Filename

1692106