基于虚拟阵列变换的干涉仪测向算法

Algorithm of Interferometer in Direction Finding Based on Virtual Array Transformation

针对宽带测向中的相位模糊问题,提出了一种基于虚拟阵列变换的干涉仪测向算法。该算法利用实际阵列的相位差作矢量运算,从而获得新的相位差,将新的相位差作为虚拟阵列相邻阵元的相位差,由此求得入射信号的方位角和俯仰角估计。经过虚拟阵列变换所获得的虚拟阵列半径较原阵列半径缩小了,从而使得系统的无模糊频段得到了扩展,为解相位模糊提供了一种新的途径。仿真结果验证了虚拟阵列变换的正确性及基于该变换的干涉仪测向算法的有效性。

A novel interferometer direction finding algorithm based on the virtual array transformation is proposed to solve the ambi- guity problem in wide bandwidth direction finding. In this approach, new phase differences are computed through vector operations on the original phase differences measured in the actual array; these new phase differences are then considered as the phase differ- ences obtained across adjacent elements of a virtual array from which the unambiguous incoming direction is calculated. The radius of virtual array obtained though virtual array transformation is greatly reduced and therefore the highest unambiguous frequency of the system is elevated to a larger extent. A new effective way of solving ambiguity can thus be derived. The results of computer simulation demonstrate the correctness of the virtual array transformation and the validity of the interferometer direction finding algo- rithm based on the virtual array transformation.