The beamforming method based on high order Cross Sensor processing

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (24) : 12-19.

ZHENG Enming1, LI Yuansong2, YU Huabing1, CHEN Xinhua1 , SUN Changyu1

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Abstract

In order to obtain robust high-resolution beamforming, a high order Cross Sensor Processing(CSP) approach is developed. This method uses the characteristic that the same oblique angle of the covariance matrix of array elements receiving signal has the same phase difference, and obtain number of virtual array elements( is the original array elements) by -order CSP. The increase of virtual array elements can effectively expand the physical aperture of linear array, and can reduce beamforming mainlobe width, so the bearing resolution is improved. In CSP, this method cumulates the different elements on the same sub-diagonal of the covariance matrix, then will decrease the influence of noise on beamforming, and improves the robustness. Numerical simulation and sea trial results show that this method can effectively reduce the beamforming mainlobe width, and improve the bearing resolution, and also decrease the interference background on bearing/ time recording (BTR). Compared with the inverse beamforming(FIM-IBF), this method has better bearing-resolution. Compared with the inverse beamforming based on auto-regression model (AR-IBF), this method can meet lower signal-to-noise ratio (SNR) and has little mean square error for bearing estimation.

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Cross Sensor processing / beamforming / high-resolution / robustness

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ZHENG Enming1, LI Yuansong2, YU Huabing1, CHEN Xinhua1,SUN Changyu1. The beamforming method based on high order Cross Sensor processing[J]. Journal of Vibration and Shock, 2015, 34(24): 12-19

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