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Robust Null Broadening Beamforming Based on Covariance Matrix Reconstruction via Virtual Interference Sources.
Sensors ( IF 3.9 ) Pub Date : 2020-03-27 , DOI: 10.3390/s20071865
Jian Yang 1, 2 , Jian Lu 2 , Xinxin Liu 2 , Guisheng Liao 1
Affiliation  

When jammers move rapidly or an antenna platform travels at high speed, interference signals may move out of the null width in the array beampattern. Consequently, the interference suppression performance can be significantly degraded. To solve this problem, both the null broadening technique and robust adaptive beamforming are considered in this paper. A novel null broadening beamforming method based on reconstruction of the interference-plus-noise covariance (INC) matrix is proposed, in order to broaden the null width and offset the motion of the interfering signals. In the moving case, a single interference signal can have multiple directions of arrival, which is equivalent to the existence of multiple interference sources. In the reconstruction of the INC matrix, several virtual interference sources are set up around each of the actual jammers, such that the nulls can be broadened. Based on the reconstructed INC and signal-plus-noise covariance (SNC) matrices, the steering vector of the desired signal can be obtained by solving a new convex optimization problem. Simulation results show that the proposed beamformer can effectively broaden the null width and deepen the null depth, and its performance in interference cancellation is robust against fast-moving jammers or array platform motion. Furthermore, the null depth can be controlled by adjusting the power parameters in the reconstruction process and, if the direction of interference motion is known, the virtual interference sources can be set to achieve better performance.

中文翻译:

基于虚拟干扰源的协方差矩阵重构的鲁棒零宽波束形成。

当干扰器快速移动或天线平台高速移动时,干扰信号可能会移出阵列波束图的零宽度。因此,干扰抑制性能会大大降低。为了解决这个问题,本文考虑了零点展宽技术和鲁棒的自适应波束形成。提出了一种基于干扰加噪声协方差(INC)矩阵重构的零陷波波束形成新方法,以扩展零陷波宽度并抵消干扰信号的运动。在移动情况下,单个干扰信号可以具有多个到达方向,这等效于存在多个干扰源。在INC矩阵的重建中,围绕每个实际干扰源设置了几个虚拟干扰源,这样可以扩大空值。基于重构的INC和信噪比协方差(SNC)矩阵,可以通过解决新的凸优化问题来获得所需信号的导引向量。仿真结果表明,所提出的波束形成器能够有效地扩大零点宽度并加深零点深度,并且其干扰消除性能对快速移动的干扰物或阵列平台运动具有鲁棒性。此外,可以通过在重建过程中调整功率参数来控制零深度,如果知道了干涉运动的方向,则可以设置虚拟干涉源以获得更好的性能。通过解决新的凸优化问题,可以获得期望信号的转向矢量。仿真结果表明,所提出的波束形成器可以有效地扩大零点宽度并加深零点深度,并且其干扰消除性能对快速移动的干扰物或阵列平台运动具有鲁棒性。此外,可以通过在重建过程中调整功率参数来控制零深度,如果知道了干涉运动的方向,则可以设置虚拟干涉源以获得更好的性能。通过解决新的凸优化问题,可以获得期望信号的转向矢量。仿真结果表明,所提出的波束形成器可以有效地扩大零点宽度并加深零点深度,并且其干扰消除性能对快速移动的干扰物或阵列平台运动具有鲁棒性。此外,可以通过在重建过程中调整功率参数来控制零深度,如果知道了干涉运动的方向,则可以设置虚拟干涉源以获得更好的性能。并且它在干扰消除方面的性能对于快速移动的干扰物或阵列平台运动具有强大的抵抗力。此外,可以通过在重建过程中调整功率参数来控制零深度,如果知道了干涉运动的方向,则可以设置虚拟干涉源以获得更好的性能。并且它在干扰消除方面的性能对于快速移动的干扰物或阵列平台运动具有强大的抵抗力。此外,可以通过在重建过程中调整功率参数来控制零深度,如果知道了干涉运动的方向,则可以设置虚拟干涉源以获得更好的性能。
更新日期:2020-03-27
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