一种实现均匀线列阵恒定束宽的方法  

A Method Realizing Constant Beam Width of Uniform Linear Array

作　　者：吕丹丹 LV Dandan(Luoyang Institute of Electro-optical Equipment of Aviation Industry,Luoyang 471000,China)

机构地区：[1]中国航空工业集团公司洛阳电光设备研究所,河南洛阳471000

出　　处：《舰船电子对抗》2024年第2期93-97,105,共6页Shipboard Electronic Countermeasure

摘　　要：当基阵接收信号为宽带时,若采用常规宽带波束形成,不同频率上波束图不同,频率越高,波束宽度越窄。当信号从波束主瓣内非主轴方向入射时,输出波形会发生失真,直接影响到后续的一系列功能,如系统估计波形、识别目标特性等。该问题的基本解决方法是,设计恒定束宽波束形成器,使基阵系统对不同频率的输入信号具有相似的波束图。研究了一种应用于均匀线列阵的恒定束宽控制方法——空间重采样法,仿真结果表明,在一定的带宽内,系统能够实现恒定束宽,证明了该方法的有效性。此外,仿真实现了空间重采样恒定束控算法在频域宽带波束形成系统中的应用。在频域宽带波束形成时,利用重叠保留法,解决了数据块之间相位不连续的问题。对于系统频带范围外的频点,采用置极小数处理的方法,抑制带外干扰,提高了结果的精确度。When the received signal by a basic array is broadband,the conventional broadband beamforming leads to the discrepancy of beam patterns at different frequencies.The higher the frequency,the narrower the beam-width.When the signals enter from non-spindle direction inside the main beam,the output waveform will be distorted,which will directly affect the subsequent functions of the system such as waveform estimation and target characteristics identification.The basic method to solve this problem is to design a beam-former of constant beam width,thus the basic array system has the same beam pattern to the input signals with different frequencies.This paper studies a control method of constant beam width applied to uniform linear array——spatial resampling method.The simulation results show that the system can achieve constant beam-width within a certain bandwidth,which confirm the effectiveness of the method.In addition,this paper simulates the application of spatial resampling constant beam control algorithm to frequency domain wideband beam-forming system.In the case of broadband beam-forming in frequency domain,the overlapping preservation method is used to solve the problem of phase discontinuity between data blocks.For the frequency points outside the band range of the system,this paper proposes an innovative minimal number processing method,which can suppress the interference outside the band and improve the result accuracy.

关 键 词：均匀线列阵 恒定束宽波束形成 空间重采样 频域波束形成 

分 类 号：TN911.7[电子电信—通信与信息系统]