卫星导航自适应调零天线抗干扰算法研究

为了提高卫星导航接收机抗干扰能力,深入研究了应用于卫导自适应调零天线的多线性约束自适应调零算法。对现有功率倒置自适应算法进行改进,将阵列协方差矩阵分为干扰子空间和噪声子空间,通过对子空间的处理提高输出信干比,在不是很强的干扰信号方向上也形成较深"零陷"。此外,为了降低计算的难度,避免自相关矩阵求逆,采用了陡降算法。通过仿真分析,结果表明:所研究的自适应滤波算法能够提供较高的输出信干比,在干扰信号方向产生较深的"零陷",具有较好的干扰抑制能力。

Research on Anti-Jamming Algorithm for GNSS Adaptive Nulling Antenna

In order to improve anti-jamming capability of GNSS navigation receiver, a multi-linear constrained adaptive algorithm is researched, which could be used on the GNSS adaptive nulling antenna. Furthermore, a steep drop algorithm is adopted to avoid the autocorrelation matrix inversion, thus, the difficulty of calculation is reduced greatly. Through the simulation and analysis, the results show that the proposed adaptive filtering algorithm can generate deeper ＂nulling＂ in the direction of interfering signals and able to provide higher output signal-interference ratio, thus it has better interference rejection capability.