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| Citation: | DUAN Xiaofei, LIU Zhiwen, and XU Yougen. Robust quaternion-valued wideband adaptive beamforming[J]. Journal of Radars, 2019, 8(1): 117–124. doi: 10.12000/JR18083
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Abstract
A robust quaternion-valued wideband adaptive beamformer is proposed, in which a quaternion is utilized to arrange the output of the array element. By exploiting the augmented envelope alignment technique, adopting the three involutions of quaternion, and incorporating the noncircular information of the signal simultaneously, a quaternion-valued wideband augmented signal model is established to achieve the robust adaptive beamforming based on signal subspace projection. Compared with other wideband beamformers, the proposed scheme exhibits a better performance in extracting noncircular signals by array aperture extension, and is insensitive to the pointing error. The simulation results verify the efficiency of the proposed beamformer. -
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References
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- Figure 1. Output waveform of six-element array
- Figure 2. Output waveform of two-element array
- Figure 3. RMSE curves versus SNR
- Figure 4. RMSE curves versus snapshot number
- Figure 5. RMSE curves versus SNR under error conditions
- Figure 6. RMSE curves versus SNR under error conditions
- Figure 7. RMSE curves versus snapshot number under error conditions