基于焦面场的多波束反射面天线二维DOA估计

doi:10.3969/j.issn.1001-506X.2020.01.04

系统工程与电子技术 ›› 2020, Vol. 42 ›› Issue (1): 23-29.doi: 10.3969/j.issn.1001-506X.2020.01.04

基于焦面场的多波束反射面天线二维DOA估计

何山红¹(), 纪萌茜¹(), 解良玉¹(), 范瑾²()

1. 安徽工业大学电气与信息工程学院, 安徽马鞍山 243002
2. 中国科学院国家天文台FAST项目组, 北京 100012

收稿日期:2019-05-24 出版日期:2020-01-01 发布日期:2019-12-23
作者简介:何山红(1973-),男,教授,硕士,主要研究方向为大型反射面天线及馈源、阵列天线设计、阵列信号处理。E-mail:antennaeng@163.com|纪萌茜(1996-),女,硕士研究生,主要研究方向为天线中的优化设计、阵列信号处理。E-mail:553677478@qq.com|解良玉(1996-),女,硕士研究生,主要研究方向为宽带天线、多频天线和多波束天线设计。E-mail:271137443@qq.com|范瑾(1985-),女,工程师,博士,主要研究方向为大型多波束射电天文望远镜天线及高性能馈源设计。E-mail:jfan@bao.ac
基金资助:
国家自然科学基金委员会-中国科学院天文联合基金(U1631115)

Two-dimensional DOA estimation for multi-beam reflector antenna based on focal-plane field

Shanhong HE¹(), Mengqian JI¹(), Liangyu XIE¹(), Jin FAN²()

1. School of Electrical Engineering & Information, Anhui University of Technology, Ma'anshan 243002, China
2. The FAST Group in the National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China

Received:2019-05-24 Online:2020-01-01 Published:2019-12-23
Supported by:
国家自然科学基金委员会-中国科学院天文联合基金(U1631115)

摘要/Abstract

摘要：

利用致密焦面阵列馈源，通过二维来波方向（direction of arrival，DOA）估计算法判别干扰信号的方向，是多波束反射面天线设计中的一个重要环节。由于阵列馈源接收的信号由源信号在反射面焦平面上的电场决定，其阵列流形与常规DOA估计平面阵列的阵列流形不相同；焦面场一般是不均匀的，因此选用的阵列单元接收的信号幅度也不相同，部分阵列单元接收的信号会比较微弱；不同的焦面场选用的阵列单元不同，对应的阵列结构也不相同，且其往往是不规则的；源信号经过反射面反射后，阵列单元接收的信号之间的相关性会降低。这些因素决定了阵列馈源的DOA估计具有特殊性。因此结合焦面场，设计了多波束反射面天线二维DOA估计方法，并进行了仿真，仿真结果证明了该方法的有效性和实用性。

关键词: 来波方向估计, 焦面场, 多波束反射面, 致密焦面阵列馈源

Abstract:

It is one of the important design processes in multi-beam reflector antennas to detect the direction of the interference signals by the two-dimensional direction of arrival (DOA) estimation algorithm with dense-focal-plane array feed. Because the signal received by elements of the dense-focal-plane array is determined by the focal-plane electric field of source signals, the array manifold of array feed is different from that of the conventional DOA planar array. The focal-plane field usually distributes uniformly; consequently, the signal strengths of array elements are different among each other and some of them are weak. Different array elements are adopted for different focal-plane fields. As a result, the array structures are not fixed and always are irregular. The correlation between the received signals of array elements will decrease after the reflection of the source signals by the reflector. All these factors determine that the DOA estimation of array feed has special features, so a two-dimensional DOA estimation method combining the focal-plane field for the multi-beam reflector antenna is proposed, and the simulation results validate its effectiveness and practicability.

Key words: direction of arrival (DOA) estimation, focal-plane field, multi-beam reflector, dense focal-plane array feed

中图分类号:

TN823

何山红, 纪萌茜, 解良玉, 范瑾. 基于焦面场的多波束反射面天线二维DOA估计[J]. 系统工程与电子技术, 2020, 42(1): 23-29.

Shanhong HE, Mengqian JI, Liangyu XIE, Jin FAN. Two-dimensional DOA estimation for multi-beam reflector antenna based on focal-plane field[J]. Systems Engineering and Electronics, 2020, 42(1): 23-29.

图/表 6

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基于焦面场的多波束反射面天线二维DOA估计

Two-dimensional DOA estimation for multi-beam reflector antenna based on focal-plane field

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