双极化天线阵列抗干扰性能研究

Research on Anti-jamming Technology of Dual-polarized Antenna Array

现代战场的电磁环境十分复杂,这使得卫星对导航抗干扰接收机的鲁棒性需求变得更为迫切。极化敏感阵列是一种利用极化信息增加信号处理维度的技术,应用在导航领域可以改善接收机抗干扰性能。本文研究了双极化阵列在复杂电磁环境下的抗干扰效果,理论分析了信号模型与双极化阵列原理,通过HFSS对阵列天线进行有限元仿真获取各阵元的幅度相位信息,利用幅相信息合成导向矢量,在MATLAB中对普通阵列和双极化阵列抗干扰能力进行仿真。为验证理论仿真的可行性,研制了双极化阵列原理样机,在暗室环境采集数据并分析信号与干扰的输出功率。在外场进行的收星定位测试中比较了普通阵列与双极化阵列的定位结果。仿真和实测的结果表明,双极化阵列能抑制超自由度干扰,且对低仰角干扰有较好的鲁棒性。值得注意的是,双极化天线在保持接收机小型化的同时表现出较好的鲁棒性,为接收机小型化提供了可行的解决方案。

The complex electromagnetic environment of modern battlefields requires strong robustness of satellite navigation anti-jamming receivers.A polarization-sensitive array uses polarization information to increase the dimension of processing signals and can be applied in navigation to improve the anti-interference performance of the receiver.In this paper,the anti-jamming of the dual-polarization array in a complex electromagnetic environment is studied.The signal model and the dual-polarization array are introduced,and the amplitude and phase information obtained by finite element simulation on HFSS are then used to synthesize the steering vector and simulate it in MATLAB to prepare the anti-jamming ability of the ordinary array and the dual-polarization array.The real data is measured in a darkroom to verify the simulation results.The satellite collection positioning test was carried out on the roof to compare the positioning results of the ordinary array and the Dual-polarization array.The simulation and experiment shows that the dual-polarization array can suppress super-degree-of-freedom jamming and has good robustness under low elevation angle jamming.The dual-polarization antenna does not change the antenna size and can maintain the receiver miniaturization while keeping good robustness.