摘要
针对卫星导航信号发射方向与干扰来波方向较近导致卫星导航信号受到抑制,并造成圆形阵列天线波束零缺陷较浅的问题,提出了一种新的虚拟天线方法——延推法。该方法利用一个圆心处实阵元,至少3个圆弧上的等距实阵元,便可虚拟拓展出虚拟阵元处的数据信息。虚拟拓展阵列相比于实际天线阵列自适应波束形成性能更优,形成零陷深度更大,零陷上段开口角更小,输出信干噪比达到稳态速度更快。相比于现有较成熟的基于高阶累积量的阵元虚拟拓展方法和基于内插变换的阵元虚拟拓展方法,该方法没有计算量较大及角度敏感的缺点,且对零陷改善情况综合性能较好。仿真结果表明,在窄带干扰与宽带干扰情况下,延推法均可准确形成足够深度的干扰抑制零陷,且相对实际阵列干扰抑制零陷深度、上段开口角性能及收敛速度性能更优。该算法对卫星导航抗干扰性能改善效果明显。
When the directions of navigation satellite and interference are too close,the satellite signals are suppressed and the null formed by the circular array antenna beam is not deep enough. To solve these problems,a new virtual antenna method called progressive extension method is proposed,which uses a solid element at the center of the circle and at least three isometric solid elements on the circle arcs to expand the data information of the virtual array.As compared with the original antenna array,the virtual extended array has better performance in adaptive beamforming,the null depth is larger,the opening angle of the upper part of the null is smaller,and the output SINR can reach the steady state faster.As compared with the existed mature virtual expansion methods based on high-order cumulants or based on interpolation transformation,this method does not have the disadvantages of large amount of computation and angular sensitivity,and it has better performance in nulling improvement. The simulation results show that under the condition of narrow-band interference and wideband interference,the extended method can accurately form the interference suppression nulls with enough depth,and it has better performance in null depth,upper opening angle and convergence speed than real arrays.This method has significantly improved the anti-jamming performance of satellite navigation.
作者
项建弘
刘利国
李爽
XIANG Jianhong;LIU Liguo;LI Shuang(College of Information and Communication Engineering,Harbin Engineering University,Harbin 150001,China;State Key Laboratory of Satellite Navigation System and Equipment Technology,Shijiazhuang 050081,China)
出处
《无线电工程》
2018年第11期41-47,共7页
Radio Engineering
基金
国家自然科学基金资助项目(61371172)
关键词
卫星导航
抗干扰
阵元虚拟拓展
调零天线
satellite navigation
anti-jamming
virtual expansion of array element
nulling antenna
