Abstract
Non-uniform linear array(NULA)configurations are well renowned due to their structural ability for providing increased degrees of freedom(DOF)and wider array aperture than uniform linear arrays(ULAs).These characteristics play a significant role in improving the direction-of-arrival(DOA)estima-tion accuracy.However,most of the existing NULA geometries are primarily applicable to circular sources(CSs),while they limi-tedly improve the DOF and continuous virtual aperture for non-circular sources(NCSs).Toward this purpose,we present a triad-displaced ULAs(Tdis-ULAs)configuration for NCS.The Tdis-ULAs structure generally consists of three ULAs,which are appropriately placed.The proposed antenna array approach fully exploits the non-circular characteristics of the sources.Given the same number of elements,the Tdis-ULAs design achieves more DOF and larger hole-free co-array aperture than its sparse array competitors.Advantageously,the number of uniform DOF,optimal distribution of elements among the ULAs,and precise element positions are uniquely determined by the closed-form expressions.Moreover,the proposed array also produces a filled resulting co-array.Numerical simulations are conducted to show the performance advantages of the proposed Tdis-ULAs configuration over its counterpart designs.
基金项目
National Natural Science Foundation of China(62031017)
National Natural Science Foundation of China(61971221)
Fundamental Research Funds for the Central Universities of China(NP2020104)
NETL
NSTL
维普
万方数据