一种基于互素阵的孔径扩展方法

物理阵元数一定的情况下，通过孔径扩展虚拟出大孔径的方法可以提高目标方向估计的分辨率。本文提出使用基于互素阵的孔径扩展方法，该方法基于互素定理，通过满足一定规则的非均匀布阵，使用两物理存在阵元接收到的信号虚拟出一新的阵元，如此将此非均匀阵列扩展为孔径较大的均匀线阵，然后进行目标波达方向估计。仿真和水池试验表明该孔径扩展方法可以显著地提高空间分辨率，以及能够得到更低的旁瓣级，显然能节省物理阵元，对工程应用来说能降低成本，所以具有良好的应用前景。

Coprime array as a new method of extended aperture

In the case of physical array elements number is determined, the estimated rate of target direction can be im-proved by the method of extended aperture. It is based on coprime theorems and the sensor of the array is non-uniform lay-out meeting certain rules, the two physical sensors are used to virtual out a new sensor, according to this approach the non-uniform array will be extended to a larger uniform linear array (ULA), then the direction of arrival (DOA) estimation is done. The simulation and water tank experiment results show that the extended aperture method can significantly improve the spa-tial resolution and get a lower side lobe level. Clearly the method can save physical sensors and reduce the actual project costs, therefore it have a good prospect of engineering application.