利用阵元相位和位置扰动形成零陷的技术  

A null steering technique by phase and element position perturbations

作　　者：曾云宝[1] 黄才试[1] 王文博[1] 

机构地区：[1]北京邮电大学电信工程学院,北京100876

出　　处：《电路与系统学报》2008年第3期18-22,共5页Journal of Circuits and Systems

基　　金：国家"863计划"项目(2004AA123160)

摘　　要：论文提出了一种利用阵元相位和位置扰动相结合形成零陷的方法,该方法假设阵元相位扰动和位置扰动都很小,因而能够利用线性化处理的方法形成零陷,相对于非线性处理方法,计算量大大降低。仿真表明单独使用阵元位置扰动或者相位扰动都不能够形成深度零陷,而采用论文提出的零陷技术,能够在多个干扰源方向形成深度零陷,而不影响主瓣,其零陷性能优于位置扰动非线性化处理方法。在此基础上,为了进一步减少需要控制的阵元数,提高系统鲁棒性,论文仿真分析了阵元位置选择性扰动和相位扰动相结合的零陷性能。仿真表明采用该方法,其性能优于文[4]中选择性非线性处理方法的性能。A method based on the combination of phase and position perturbations is proposed. The general nonnnear problem is linearized by assuming the perturbations to be small, and analytic solution is derived, which dramatically reduces the computation complexity. Computer simulation demonstrates that neither phase nor position perturbations can form deep nulls in the given directions, while the proposed method can place nulls with satisfied null depth in the directions of interference sources without affecting the main beam. Based on this method, the capacity of the combination of phase and position perturbation with selected elements is also analyzed for the purpose of reducing the controlled number of array elements and improving the robust of the system. Computer simulation demonstrates that both proposed methods＇ performances are better than the nonlinear method of position perturbation.

关 键 词：相位扰动 位置扰动 零陷 

分 类 号：TN929.5[电子电信—通信与信息系统]