基于频域多目标测向的星载赋形天线调零算法

Novel space-borne shaping antenna nulling method based on multi-target direction finding algorithm

为了保证通信卫星在人为电磁干扰及复杂电磁环境下的正常工作,给出了一种用于星载赋形天线的频域多干扰目标测向及调零方法。该方法首先采用频域多目标测向算法实现多干扰源的方向估计;然后基于估计出的干扰源到达方向,采用带主波束保形的波束置零算法,以达到对主波束保形和多个干扰进行抑制的目的,较好地兼顾了调零深度与主波束保形效果这两个方面;最后分析了有多个干扰时该方法的性能。仿真结果和性能分析验证了该方法的有效性和可行性。

In order to make the telecommunication satellite operate well in the electromagnetic jamming and complex electromagnetic environment, a novel space-borne antenna multi-jamming direction finding and nulling method is presented. Firstly, a single-snapshot DOA estimation algorithm in frequency domain is gived to estimate the DOA of multiple targets, and then a nulling algorithm that keeps the shape of the main-lobe is implemented according to the above-estimated DOA compared with the conventional sidelobe cancelling algorithm. The algorithm solves the problems of both nulling depth and main-lobe shape keeping effect. Simulation results and performance analysis demonstrate that the algorithm is effective and feasible.