基于高阶次Cross Sensor处理的波束形成方法

郑恩明1,黎远松2,余华兵1,陈新华1,孙长瑜1

振动与冲击 ›› 2015, Vol. 34 ›› Issue (24) : 12-19.

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振动与冲击 ›› 2015, Vol. 34 ›› Issue (24) : 12-19.
论文

基于高阶次Cross Sensor处理的波束形成方法

  • 郑恩明1,黎远松2,余华兵1,陈新华1,孙长瑜1
作者信息 +

The beamforming method based on high order Cross Sensor processing

  • ZHENG Enming1, LI Yuansong2, YU Huabing1, CHEN Xinhua1 , SUN Changyu1
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文章历史 +

摘要

为得到鲁棒性、高分辨波束形成,提出了一种高阶次Cross Sensor处理方法。该方法依据阵元间协方差矩阵同一斜对角线上不同元素具有相同相位差的特点,对协方差矩阵进行 阶次Cross Sensor处理后可虚拟出近 个虚拟阵元( 为原始阵元数)。虚拟阵元的增加可扩大线阵有效孔径,降低波束形成主瓣宽度,提高方位分辨率。在Cross Sensor处理过程中,该方法对协方差矩阵同一斜对角线上不同元素进行了叠加运算,可进一步削弱噪声对波束形成的影响,提高了波束形成鲁棒性。数值仿真和海上试验结果表明,该方法既能有效降低波束形成主瓣宽度,提高方位分辨率,又可削弱方位历程图干扰背景。相比已有的逆波束形成,该方法具有较好的方位分辨率;相比已有的基于AR模型的高分辨逆波束形成,该方法对最低门限信噪比的要求较低,方位估计均方误差较小。

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.

关键词

Cross Sensor处理 / 波束形成 / 高分辨 / 鲁棒性

Key words

Cross Sensor processing / beamforming / high-resolution / robustness

引用本文

导出引用
郑恩明1,黎远松2,余华兵1,陈新华1,孙长瑜1. 基于高阶次Cross Sensor处理的波束形成方法[J]. 振动与冲击, 2015, 34(24): 12-19
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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