为提高脉冲多普勒(Pulse Doppler，PD)引信的波达方向(Direction of Arrival，DOA)分辨率，利用引信的运动特性，将不同时刻下的回波数据进行组合，合成一个大孔径的虚拟阵列，达到扩展孔径的目的，并利用数字波束形成(Digital Beam Forming，DBF)实现对目标的高分辨角度估计。针对合成虚拟阵列非均匀性导致DBF计算复杂度高的问题，将合成虚拟阵列分解为固有子阵与运动子阵，分别进行DBF处理后并用两波束的乘积代替合成虚拟阵列的波束，在保证高角度分辨率的同时，降低对合成虚拟阵列直接进行DBF运算的复杂度。仿真与实验结果表明，在较少阵元的情况下该方法有效地提高了PD引信的DOA分辨率。
A High Resolution DOA Method Based on Synthetic Virtual Array for Pulse Doppler Fuze
A DOA method based on synthetic virtual array is proposed to achieve a high direction-of-arrival(DOA)resolution forpulse Doppler(PD)fuze.Taking advantage of the motion characteristics of PD fuze,a largervirtual aperture array can be formed by combining the target echoes data at different moments.In order to solve the problem of high computational complexity caused by the non-uniformity of synthetic virtual array,the synthetic virtual array is decomposed into original subarray and moving subarray.After DBF processing,the wave beams of two subarrays is used to replace the wave beam the synthetic virtual array,which not only obtains the high angle resolution,but also reduces the complexity of direct DBF operation of synthetic virtual array.The simulated and experimental results show that the proposed method can be used to improvethe DOA resolution of PD fuze under the condition of fewer array elements.
pulse Doppler fuzedirection of arrivalsynthetic arrayarray decompositiondigital beam forming
万方数据
维普
