兼具高自由度低互耦的间距约束稀疏阵列设计

针对传统稀疏阵列难以实现孔径和互耦同步优化导致测向误差的问题,设计了一种兼具高自由度低互耦的间距约束稀疏阵列.该阵列由四段均匀线阵以一定间隔首尾相连构成,约束每段均匀线阵的阵元间距以及各段均匀线阵之间的间距尽可能大,形成了3段稀疏的均匀线阵和1段密布的线阵,有效减少了阵元间的互耦效应,基于该阵列推导了物理阵元位置、差联合阵列的闭式解以及自由度的闭式解.与相同阵元数的传统稀疏阵列以及改进稀疏阵列相比,设计的间距约束稀疏阵列拥有更大的孔径、更低的互耦以及更多的连续虚拟阵元,通过实验仿真验证了间距约束稀疏阵列的优越性.

An Inter Element Spacing Restriction Array Design with High Degree of Freedom and Low Mutual Coupling

Aimed at the problem that the traditional sparse array is hard to realize direction finding error caused by the synchronization optimization of aperture and mutual coupling, an inter element spacing restriction array with high degree of freedom and low mutual coupling is designed. The array is composed of four uniform linear arrays connected from beginning to end at a certain interval, and the restriction at which the array element spacing of each uniform linear array and the space between each uniform linear array are as large as possible is done, thus forming three sparse uniform linear arrays and one dense linear array, and effectively reducing the mutual coupling effect among array elements. Based on this array, the closed solutions of physical array element position and difference joint array and the closed solutions of degree of freedom are derived. Compared with the traditional and improved sparse arrays with the same number of array elements, the designed inter element spacing restriction array has larger aperture, lower mutual coupling and more continuous virtual array elements. The advantages of inter element spacing restriction array are verified by experimental simulation.