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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2012-02-14
Modified DOA Estimation Methods with Unknown Source Number Based on Projection Pretransformation
By
Qing-Chen Zhou,

    Dr. Qing-Chen Zhou

    Electronic Information Department

    Wuhan University

    China

    Homepage

Huotao Gao,

    Prof. Huotao Gao

    Electronic Information Department

    Wuhan University

    China

    Homepage

Fan Wang,

    Dr. Fan Wang

    Electronic Information Department

    Wuhan University

    China

    Homepage

Jie Shi

    Dr. Jie Shi

    Electronic Information Department

    Wuhan University

    China

    Homepage

Progress In Electromagnetics Research B, Vol. 38, 387-403, 2012
doi:10.2528/PIERB11121313 | Google Scholar

Abstract
In this paper, our purpose is to develop methods that have high resolution and robustness in the presence of unknown source number, array error, snapshot deficient, and low SNR. The DOA (Direction-Of-Arrival) estimation with unknown source number methods referred as MUSIC-like and SSMUSIC-like methods have shown high resolution in the snapshot deficient and low SNR scenario. However, they need to take several times of fine search on the full space, which bring about high computational complexities. Thus, modified methods are proposed to reduce computational complexities and improve performances further. In the modified methods, we priori use conventional beamforming to get the rough distribution of signals' angle, which helps to reduce computational complexity and connect the technique of projection pretransformation. Then through projection pretransformation, original methods are further simplified and improved. As demonstrated in computer simulations, the modified DOA estimation with unknown source number methods shows not only higher resolution in the snapshot deficient and lower SNR scenario, but also more robustness against array errors. Although the proposed methods cannot replace the array calibration completely, they reduce the requirement of calibration accuracy. Combined with these advantages, it has been shown that the new methods are more suitable in engineering.
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Citation
Qing-Chen Zhou, Huotao Gao, Fan Wang, and Jie Shi, "Modified DOA Estimation Methods with Unknown Source Number Based on Projection Pretransformation," Progress In Electromagnetics Research B, Vol. 38, 387-403, 2012.
doi:10.2528/PIERB11121313
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