载波相位辅助的卫星导航天线阵抗干扰算法

Anti-jamming algorithm for GNSS antenna array aided by carrier phase

针对卫星导航接收机的抗干扰问题,提出一种基于载波相位辅助的卫星导航天线阵抗干扰算法。该算法进行盲零陷形成的同时利用各阵元通道输出信号的载波相位辅助来进行盲波束形成,并通过控制算法实现智能切换。仿真结果表明,提出的算法在干扰环境且接收机冷启动的条件下仍能成功抑制干扰、正常运行,在无干扰或弱干扰条件下能进行波束形成来增强卫星信号,从而提高卫星可见性以及定位精度。提出的算法不需要姿态测量单元辅助且对阵元幅相不一致引起的导向矢量误差不敏感,其实现代价远小于传统的波束形成算法。

An anti-jamming algorithm for satellite navigation antenna array aided by carrier phase was proposed to mitigate the interference of satellite navigation receiver. The blind null steering was achieved through the algorithm and the blind beam steering was realized simultaneously with the aid of the carrier phase of the output signal from each individual antenna, and two steerings could be switched by a control algorithm. The simulation results show that the proposed algorithm performs well at ＂cold＂ start when the receiver is initiated in strong interference conditions. It can enhance the satellite signals by steering beams to the satellites under noninterference or weak interference conditions, so the visibility and positioning accuracy of satellite are improved. The proposed algorithm can work normally without the aid of inertial measurement unit, and is robust to the steering vector errors caused by amplitude-phase mismatch. It has less cost than traditional beamforming algorithms for implementation.