信号处理
信號處理
신호처리
SIGNAL PROCESSING
2014年
9期
1104-1111
,共8页
丁永超%刘成城%赵拥军%陈辉
丁永超%劉成城%趙擁軍%陳輝
정영초%류성성%조옹군%진휘
宽带波束形成%多径干扰%稳健性%相位响应约束%能量聚焦
寬帶波束形成%多徑榦擾%穩健性%相位響應約束%能量聚焦
관대파속형성%다경간우%은건성%상위향응약속%능량취초
wideband beamforming%multipath interference%robustness%phase response constraint%energy focusing
针对传统宽带多径干扰抑制波束形成算法计算量大、稳健性差的问题,提出一种基于均匀直线阵的稳健宽带多径干扰抑制波束形成算法。当期望信号垂直入射时,该算法首先在波束旁瓣区域引入虚拟干扰源构造能量聚焦矩阵,通过主瓣宽度的迭代处理,整体控制输出波束旁瓣级,将旁瓣区域能量聚焦到主瓣区域,实现多径干扰条件下的宽带波束形成;然后对期望信号和辅助方位角施加相位响应约束,将其扩展至期望信号非垂直入射和存在指向误差的情况,与传统宽带多径干扰抑制波束形成算法相比,在提高算法稳健性的同时大大降低了计算复杂度;最后仿真分析与实际数据验证表明,该算法能够有效的抑制多径干扰,稳健性较好且具有较高的输出信干噪比。
針對傳統寬帶多徑榦擾抑製波束形成算法計算量大、穩健性差的問題,提齣一種基于均勻直線陣的穩健寬帶多徑榦擾抑製波束形成算法。噹期望信號垂直入射時,該算法首先在波束徬瓣區域引入虛擬榦擾源構造能量聚焦矩陣,通過主瓣寬度的迭代處理,整體控製輸齣波束徬瓣級,將徬瓣區域能量聚焦到主瓣區域,實現多徑榦擾條件下的寬帶波束形成;然後對期望信號和輔助方位角施加相位響應約束,將其擴展至期望信號非垂直入射和存在指嚮誤差的情況,與傳統寬帶多徑榦擾抑製波束形成算法相比,在提高算法穩健性的同時大大降低瞭計算複雜度;最後倣真分析與實際數據驗證錶明,該算法能夠有效的抑製多徑榦擾,穩健性較好且具有較高的輸齣信榦譟比。
침대전통관대다경간우억제파속형성산법계산량대、은건성차적문제,제출일충기우균균직선진적은건관대다경간우억제파속형성산법。당기망신호수직입사시,해산법수선재파속방판구역인입허의간우원구조능량취초구진,통과주판관도적질대처리,정체공제수출파속방판급,장방판구역능량취초도주판구역,실현다경간우조건하적관대파속형성;연후대기망신호화보조방위각시가상위향응약속,장기확전지기망신호비수직입사화존재지향오차적정황,여전통관대다경간우억제파속형성산법상비,재제고산법은건성적동시대대강저료계산복잡도;최후방진분석여실제수거험증표명,해산법능구유효적억제다경간우,은건성교호차구유교고적수출신간조비。
In order to solve the computational complexity and robustness problem of traditional wideband multipath inter-ference suppression beamforming algorithms,a robust algorithm based on uniform linear array is proposed.First of all, when the desired signal normal incidence,this algorithm introduces virtual interferences in sidelobe region to construct en-ergy focusing matrix,and wholly controls the output beam sidelobe level by iterative processing of mainlobe,then it focuses sidelobe energy to mainlobe to achieve wideband beamforming in multipath environment.Furthermore,this algorithm is ex-tended to the case of desired signal non-normal incidence and direction error existing,through imposing phase response constraints to desired signal and auxiliary azimuth.Comparing with the traditional algorithms,the proposed algorithm has lower computational complexity and better robustness.Finally,the simulation and actual data analysis results show that the algorithm can suppress the multipath interference effectively,attain better robustness and higher output signal to interfer-ence noise ratio (SINR).