DocumentCode :
390098
Title :
A low-complexity robust bearing estimator using quadric rotational invariance of covariance matrix for the distributed source
Author :
Liu, Shen Jian ; Wan, Qun ; Peng, Ying Ning
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
Volume :
2
fYear :
2002
fDate :
28-31 Oct. 2002
Firstpage :
1004
Abstract :
Many methods were proposed to estimate the bearing of spatially distributed source. They usually suffer from heavy computational load and limit to small angle spread due to model-approximated error. The main contribution of this paper is twofold. First, the unimodal symmetric space frequency distribution is introduced to describe the source model. The exact expression of covariance matrix can be calculated without approximating processing even in the cafe of large angle spread. Second, using Toeplitz and quadric rotational invariance of covariance matrix, a novel estimator is proposed by solving a nonlinear least-squared problem in central space frequency. It only requires a FFT or one-dimension search to obtain the bearing estimate: Numerical results illustrate its asymptotic efficiency and robustness in the large spread case.
Keywords :
Toeplitz matrices; array signal processing; computational complexity; covariance matrices; direction-of-arrival estimation; fast Fourier transforms; least squares approximations; nonlinear equations; FFT; Toeplitz matrix; angle spread; array processing; asymptotic efficiency; central space frequency; computational load; covariance matrix; distributed source; exact expression; low-complexity robust bearing estimator; mobile communications; model-approximated error; multipath scattering; nonlinear least-squared problem; one-dimension search; quadric rotational invariance; source model; spatially distributed source; unimodal symmetric space frequency distribution; Array signal processing; Covariance matrix; Direction of arrival estimation; Frequency estimation; Mobile communication; Narrowband; Parameter estimation; Robustness; Scattering; Sonar applications;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
TENCON '02. Proceedings. 2002 IEEE Region 10 Conference on Computers, Communications, Control and Power Engineering
Print_ISBN :
0-7803-7490-8
Type :
conf
DOI :
10.1109/TENCON.2002.1180291
Filename :
1180291
Link To Document :
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