CAJ | 학술논문

基于 Khatri-Rao(K-R)子空间提出一种提升阵列自由度的非均匀阵列排布方式,即新型嵌套阵列。新型嵌套阵列由大小2个均匀线阵(ULA)构成,较大 ULA 的阵元间隔取决于较小ULA 的阵列长度。相较于自由度为 O N()的 N 阵元 ULA,N 个阵元的新型嵌套阵可通过在K-R 子空间中得到阵元数为 N 2/2+ N -1()的虚拟 ULA,将阵列自由度提升至 O N 2(),大大提高了分辨多信源的能力。同时由于阵元稀疏排布,N 个阵元的新型嵌套阵的有效孔径大于 N 阵元 ULA,使新型嵌套阵列分辨临近目标的能力优于 ULA。在通过 K-R 子空间得到虚拟 ULA 的稀疏阵列流型中,新型嵌套阵列是自由度提升最大的方式之一,且在低信噪比和小快拍数情况下依然有较好性能。
기우 Khatri-Rao(K-R)자공간제출일충제승진렬자유도적비균균진렬배포방식,즉신형감투진렬。신형감투진렬유대소2개균균선진(ULA)구성,교대 ULA 적진원간격취결우교소ULA 적진렬장도。상교우자유도위 O N()적 N 진원 ULA,N 개진원적신형감투진가통과재K-R 자공간중득도진원수위 N 2/2+ N -1()적허의 ULA,장진렬자유도제승지 O N 2(),대대제고료분변다신원적능력。동시유우진원희소배포,N 개진원적신형감투진적유효공경대우 N 진원 ULA,사신형감투진렬분변림근목표적능력우우 ULA。재통과 K-R 자공간득도허의 ULA 적희소진렬류형중,신형감투진렬시자유도제승최대적방식지일,차재저신조비화소쾌박수정황하의연유교호성능。
A novel sparse linear array geometry,i.e.a new nested array,is proposed based on Khatri??Rao (K??R)subspace ,which is capable of increasing the degrees of freedom (DOF)of arrays.The new nested array consists of two uniform linear arrays (ULA),where the spacing of larger ULA is determined by the array length of smaller one.Compared with a ULA providing DOF with sensors,a new nested array is able to increase the DOF to by obtaining a virtual ULA with sensors through K??R product in K??R subspace, and thus the increased DOF makes it possible to resolve more sources.In addition,the new nested array is a sparse array,and has longer aperture than that of ULA in equal number of sensors to bring a good ability to resolve nearby targets.The new nested array is one of the arrays,which have the largest DOF increased by K??R product,and the performance of the new nested array is good even under the condition of low SNR and small snapshots.