基于虚拟阵技术与LS的宽带DBF算法

张哲辰; 刘三阳; 毛睿达

引用本文:	张哲辰，刘三阳，毛睿达. 基于虚拟阵技术与LS的宽带DBF算法[J]. 雷达科学与技术, 2019, 17(3): 257-262.[点击复制]
	ZHANG Zhechen，LIU Sanyang，MAO Ruida. Wideband DBF Algorithm Based on Virtual Array Technology and LS[J]. Radar Science and Technology, 2019, 17(3): 257-262.[点击复制]

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基于虚拟阵技术与LS的宽带DBF算法
张哲辰，刘三阳，毛睿达
1.西安电子科技大学数学与统计学院，陕西西安 710071;2.西安电子科技大学电子信息攻防对抗与仿真技术教育部重点实验室，陕西西安 710071

摘要:

数字侦察接收机带宽可能覆盖几个倍频，因此若按照信号最高频率信号半波长作为阵元间距，则会出现严重的阵元间耦合，而若按照信号最低频率信号半波长作为阵元间距，则对高频信号出现严重的栅瓣。针对上述问题，提出了虚拟阵技术和LS算法融合的宽带DBF算法，成功抑制了高频信号的栅瓣。研究了EAVA、TAVA两种虚拟阵技术，两种技术不需要侦察信号的先验知识，应用两种快速计算虚拟阵元信号的算法，对于最终得出来的阵元信号选用最小二乘(LS)算法进行宽带聚焦处理，最后波束形成。仿真信号选用S波段(2~4GHz)雷达信号，结果表明在同一真实阵元数情况下，两种算法均能抑制信号栅瓣，并且缩小主瓣宽度，从而提高数字侦察接收机的角度分辨率。

关键词: 栅瓣抑制宽带DBF 虚拟阵聚焦处理

DOI：DOI:10.3969/j.issn.1672-2337.2019.03.004

分类号:TN957

基金项目:中央高校基本科研业务费专项资金（No.JBF180701）；陕西省自然科学基础研究计划项目（No.2017JM1001）

Wideband DBF Algorithm Based on Virtual Array Technology and LS

ZHANG Zhechen，LIU Sanyang，MAO Ruida

1.School of Mathematics and Statistics, Xidian University, Xi'an 710071, China;2.2.Key Laboratory of Electronic Information Countermeasure and Simulation Technology, Ministry of Education, Xidian University, Xi'an 710071, China

Abstract:

Digital reconnaissance receiver can cover several frequency bandwidths. If the array element spacing takes the half wavelength of the highest frequency signal, there will be serious coupling between elements. And if the array element spacing takes the half wavelength of the lowest frequency signal, serious grating lobes appear in the high frequency signal.To solve the problem, a wideband DBF algorithm that combines virtual array technology and LS (least square)algorithm is proposed.Two kinds of virtual array technologies, EAVA and TAVA, are researched.The two technologies do not need the prior knowledge of the reconnaissance signal. And two algorithms that can fast calculate virtual array signal are used. The obtained array signal experiences wideband focus processing by using the LS algorithm, and finally, beamforming is realized. The simulation of S band (2~4GHz) radar signal is carried out. The results show that the two algorithms can suppress the gating lobes and reduce the width of the main lobe, which improves the angular resolution of the digital reconnaissance receiver under the same number of real array elements.

Key words: gating lobe suppression broadband digital beamforming virtual array focus processing