基于互质阵列的近场源位置估计方法

doi:10.12382/bgxb.2022.0733

摘要/Abstract

摘要：

针对均匀线列阵检测信号数目受阵元个数限制、估计精度受阵列孔径影响等问题,提出一种基于互质阵列的近场源位置估计方法。对阵列接收数据进行预处理,建立只包含角度参数的模型,利用迭代方法来逐步修正角度偏移向量和功率向量,得到入射信号的波达方向;固定已估计出的角度,建立关于距离参数的离网格模型,通过迭代方式逐步修正距离偏移向量,从而得到距离估计值;通过仿真实验对所提方法进行验证。理论分析和仿真实验结果表明,该方法扩展了阵列孔径,提高了方位和距离的估计精度,在低信噪比和少快拍的情况下依然具有良好的估计性能,同时自动匹配估计角度与估计距离,确定信源位置。

关键词: 方位估计, 距离估计, 互质阵列, 近场源

Abstract:

For the problems that the number of detection signals is limited by the number of array elements and the estimation accuracy is affected by the array aperture for uniform linear array, a near-field source location estimation method based on coprime arrays is proposed. In the proposed method, the received data of the coprime array is preprocessed, and a model that contains only angle parameter is established. The angle offset vector and power vector are modified gradually by iterative method to obtain the final DOA of incident signal. An off-grid model about the distance parameter is established by fixing the estimated angle. The distance estimation value is obtained by iteratively modifying the distance offset vector gradually. The proposed method was verified by simulation test. Theoretically analyzed and simulated results show that the proposed method is used to expand the array aperture effectively improve the estimation accuracies of angle and distance, and still has good estimation performance in the case of low signal-to-noise ratio and small snapshots. At the same time, the estimated angle and distance are automatically matched to determine the location of near-field source.

Key words: direction of arrival estimation, distance estimation, coprime array, near-field source

中图分类号:

TN911.7

王绪虎, 田雨, 张群飞, 李恩玉, 金序, 侯玉君. 基于互质阵列的近场源位置估计方法[J]. 兵工学报, 2023, 44(10): 3227-3236.

WANG Xuhu, TIAN Yu, ZHANG Qunfei, LI Enyu, JIN Xu, HOU Yujun. Near-field Source Location Estimation Method Based on Coprime Arrays[J]. Acta Armamentarii, 2023, 44(10): 3227-3236.

图/表 7

图1 近场信号源模型结构图

Fig.1 Model configuration of near-field source

图2 各类方法的归一化功率谱图

Fig.2 Normalized power spectra of various methods

图3 角度与距离对应关系

Fig.3 Relationship between angle and distance

图4 不同SNR下的RMSE性能

Fig.4 RMSE performance versus SNR of different methods

图5 不同快拍数各类方法的RMSE性能

Fig.5 RMSE performances of different snapshot methods

图6 角度分辨力变化

Fig.6 Variation graph of angle resolution

图7 距离分辨力变化曲线图

Fig.7 Variation graph of distance resolution

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