摘要
针对空间谱估计中如何利用有限的天线阵元获得尽可能多的自由度问题,在差分合成阵列理论的基础上设计了一种由一个均匀线性阵列和一个非均匀线性阵列级联而成的新型阵列结构。该阵列结构具有明确的阵元排布方式以及闭式的自由度表达形式。相比于现有的均匀线性阵列、嵌套阵列和互质阵列,在给定相同阵元数的条件下,它能提供更多的自由度。这就意味着,它能够分辨更多的目标,或在相同阵元个数和相同目标源个数的条件下,具有更高的角度估计精度。通过详细的仿真对比及分析,验证了所设计阵列结构的有效性以及优越性。
Aiming at how to acquire more degree-of-freedom(DOF)with limited number of physical sensors,a new sensor array geometry is designed based on the differential composite array;it is constructed by cascading a uniform linear array(ULA)and a non-uniform one.Such array geometry has determined sensors’deployment and closed-form DOFs expression.Compared with some exist array geometries such as ULA,nested array and coprime array,it can provide more DOFs,that means,the designed array can distinguish more sources with fixed number of physical sensors or can give more accurate direction of arrival(DOA)estimation.By detailed comparison and analysis of numerical simulations,the effectiveness and superiority of the designed array geometry is confirmed.
作者
王宇
姚博彬
武奇生
WANG Yu;YAO Bobin;WU Qisheng(School of Electronic and Control Engineering,Chang'an University,Xi'an 710064,China)
出处
《工业仪表与自动化装置》
2019年第6期3-7,共5页
Industrial Instrumentation & Automation
基金
国家自然科学基金青年基金项目(61601058)
关键词
差分合成阵列
自由度
波达方向
空间谱估计
differential composite array
degree-of-freedom
direction of arrival
spatial spectrum estimation