基于虚拟阵技术与LS的宽带DBF算法
|
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(2～4GHz)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。
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.
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.
引文
[1]常仁,王小谟,刘姜玲,等.数字端射阵列栅瓣抑制研究[J].中国电子科学研究院学报,2014,9(3):287-290.
[2]ZENG Tao,MAO Cong,HU Cheng,et al.Grating Lobes Suppression Method for Stepped Frequency GB-SAR System[J].Journal of Systems Engineering and Electronics,2014,25(6):987-995.
[3]程乃平,潘点飞.大型阵列天线子阵划分及栅瓣抑制方法[J].信号处理,2014,30(5):535-543.
[4]安政帅.基于改进遗传算法的分布式阵列栅瓣抑制算法研究[J].火控雷达技术,2017,46(1):24-28.
[5]曹爱华,李海林,马守磊,等.雷达发射机阵列稳健栅瓣抑制算法研究[J].计算机仿真,2017,34(1):11-15.
[6]丛雯珊,陈辉.基于栅瓣宽度的稀疏阵列方向图综合算法[J].电子信息对抗技术,2015,30(4):63-67.
[7]莫子军,焦龙飞.基于栅瓣等波动阵列设计方法[J].电子科技,2015,28(7):60-62.
[8]HU Mengzhong,JIN Xueming,HU Yuankui.AMethod for Suppressing Grating Lobes of Wideband Reconnaissance DBF[C]∥2016IEEE Advanced Information Management,Communicates,Electronic and Automation Control Conference,Xian:IEEE,2016:1547-1550.
[9]HUNG H,KAVEH M.Focusing Matrices for Coherent Signal-Subspace Processing[J].IEEE Trans on A-coustics,Speech and Signal Processing,1998,36(8):1272-1281.
[10]KIRSTEINS I P,TUFTS D W.Adaptive Detection Using Low Rank Approximation to a Data Matrix[J].IEEE Trans on Aerospace and Electronic Systems,1994,30(1):55-67.
[2]ZENG Tao,MAO Cong,HU Cheng,et al.Grating Lobes Suppression Method for Stepped Frequency GB-SAR System[J].Journal of Systems Engineering and Electronics,2014,25(6):987-995.
[3]程乃平,潘点飞.大型阵列天线子阵划分及栅瓣抑制方法[J].信号处理,2014,30(5):535-543.
[4]安政帅.基于改进遗传算法的分布式阵列栅瓣抑制算法研究[J].火控雷达技术,2017,46(1):24-28.
[5]曹爱华,李海林,马守磊,等.雷达发射机阵列稳健栅瓣抑制算法研究[J].计算机仿真,2017,34(1):11-15.
[6]丛雯珊,陈辉.基于栅瓣宽度的稀疏阵列方向图综合算法[J].电子信息对抗技术,2015,30(4):63-67.
[7]莫子军,焦龙飞.基于栅瓣等波动阵列设计方法[J].电子科技,2015,28(7):60-62.
[8]HU Mengzhong,JIN Xueming,HU Yuankui.AMethod for Suppressing Grating Lobes of Wideband Reconnaissance DBF[C]∥2016IEEE Advanced Information Management,Communicates,Electronic and Automation Control Conference,Xian:IEEE,2016:1547-1550.
[9]HUNG H,KAVEH M.Focusing Matrices for Coherent Signal-Subspace Processing[J].IEEE Trans on A-coustics,Speech and Signal Processing,1998,36(8):1272-1281.
[10]KIRSTEINS I P,TUFTS D W.Adaptive Detection Using Low Rank Approximation to a Data Matrix[J].IEEE Trans on Aerospace and Electronic Systems,1994,30(1):55-67.