基于旋转阵列的极化敏感DOA估计算法  

A Polarization Sensitive DOA Estimation Algorithm based on Rotating Array

作　　者：石孟鑫 司伟建 SHI Meng-xin;Si Wei-jian(Harbin Engineering University,Harbin Heilongjiang 150001,China)

机构地区：[1]哈尔滨工程大学,黑龙江哈尔滨150001

出　　处：《通信技术》2020年第12期2927-2935,共9页Communications Technology

基　　金：国家自然科学基金项目(No.61671168,No.61801143);中央高校基本科研业务费专项基金项目(No.3072019CF0801);黑龙江省自然科学基金项目(No.LH2020F019);航空科学基金(No.2019010P6001)。

摘　　要：随着信息化战争需求和现代雷达技术的发展,人们对阵列波达方向估计算法提出了更高的要求。传统极化敏感阵列的波达方向(Direction of Arrival,DOA)估计算法计算量非常大,需要对入射信号进行包含空间角度和极化信息的四维谱峰搜索。此外,要求阵元数目大于目标数,而测向精度受通道不一致性影响很大。针对这些问题,提出一种正交偶极子对旋转阵列的DOA和极化参数联合谱参数估计算法。利用矩阵秩亏原理,通过对四维谱函数的降维运算降低计算复杂度。通过对两天线阵元进行旋转引入虚拟阵元,相当于利用两阵元对目标进行多位置观测,减少了信道数量,提高了阵元利用率。仿真结果表明,该算法能够有效降低通道不一致性对测向结果的影响,具有比6阵元正交偶极子圆阵更好的测向性能。With the development of information warfare and modern radar technology,higher requirements are put forward for array wave arrival estimation algorithm.The DOA(Direction of Arrival)estimation algorithm of traditional polarization-sensitive array requires a 4-dimensional spectral peak search of the incident signal including the spatial angle and polarization information,which requires a large amount of computation.In addition,the number of array elements is required to be greater than the number of targets,and the direction-finding accuracy is greatly affected by channel inconsistency.In order to solve these problems,a new algorithm which joints spectral estimation algorithm of low complex signal DOA and polarization parameters is proposed.Using the matrix rank loss principle,the computational complexity is reduced by the dimensionality reduction operation of the 4-dimension spectral function.The virtual array element is introduced by rotating the two antenna elements,which is equivalent to using the two array elements for multi-position observation of the target,thus reducing the number of channels and improving the utilization rate of the array elements.The simulation results show that this algorithm can effectively reduce the influence of channel inconsistency on the direction-finding results and has better performance than the six-element orthogonal dipole circular array.

关 键 词：波达方向估计 旋转阵列 极化敏感阵列 矩阵秩亏 通道不一致性 

分 类 号：TN911[电子电信—通信与信息系统]