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论文:2019,Vol:37,Issue(4):838-845 |
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引用本文： |
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武涛, 邓正宏, 徐继伟, 古清月. 基于双L型阵列的二维非相干分布源参数估计[J]. 西北工业大学学报 |
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WU Tao, DENG Zhenghong, XU Jiwei, GU Qingyue. Estimation for Two-Dimensional Incoherently Distributed Source in Double L-Shape Arrays[J]. Northwestern polytechnical university |
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| 基于双L型阵列的二维非相干分布源参数估计 |
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| 武涛1, 邓正宏1, 徐继伟1, 古清月2 |
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1. 西北工业大学 自动化学院, 陕西 西安 710072;
2. 西北工业大学 航海学院, 陕西 西安 710072 |
| 摘要: |
| 分布源信号可以看作点源信号在一定空间范围内的聚集。研究二维非相干分布源的参数估计问题，提出一种基于双L型阵列结构的分布源参数估计方法。通过一阶泰勒展开推导出平行阵列广义方向矢量关于中心方位角和中心俯仰角的旋转不变关系，在此基础上利用接收矢量协方差矩阵的信号子空间得出旋转算子，依据参数配对方法解算出中心方位角和中心俯仰角，二维波达方向的估计不需要谱峰搜索，适用于角功率函数未知和多个分布源的情景。最后通过二维Capon谱峰搜索确定角度扩展参数。通过仿真考察实验条件、扩展角度对估计结果的影响，实验表明所提算法具有良好估计性能。 |
| 关键词:
波达方向
非相干分布源
广义方向矢量
双L型阵列
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| Estimation for Two-Dimensional Incoherently Distributed Source in Double L-Shape Arrays |
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| WU Tao1, DENG Zhenghong1, XU Jiwei1, GU Qingyue2 |
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1. School of Automation, Northwestern Polytechnical University, Xi'an 710072, China;
2. School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China |
| Abstract: |
| Distributed sources can be regarded as an assembly of point sources within a spatial distribution. In this paper, we explore the estimation of the two-dimensional incoherently distributed sources using double L-shape arrays. The rotational invariance properties of the nominal elevation and nominal elevation are firstly obtained by taking first-order Taylor series expansions with regard to the generalized steering vectors of two pairs of parallel subarrays. The rotation operators can be solved based on signal subspace. Then the nominal elevation and nominal elevation can be obtained from parameters matching method. Estimation of direction of arrival can be used in multi-source scenario and needn't peak-finding search. Lastly the angular spreads can be solved through two-dimensional Capon search based on nominal angles. The simulation experiments show that the proposed method has good performance on the estimation of two-dimensional incoherently distributed sources. Investigating different experimental conditions, sources with different angular spreads, simulations are conducted to validate better estimation accuracy of the proposed method. |
| Key words:
direction of arrival
incoherently distributed sources
generalized steering vectors
double L-shape arrays
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| 收稿日期: 2018-08-10
修回日期:
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| DOI: 10.1051/jnwpu/20193740838 |
| 基金项目: 国家自然科学基金（61471299，U1609216）与陕西省重点研发项目（2017ZDXM-GY-139）资助 |
| 通讯作者:
Email： |
| 作者简介: 武涛(1984-),西北工业大学博士研究生,主要从事阵列信号处理、目标探测与成像研究。
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