级联结构的阵列天线导航接收机抗干扰及多径抑制方法

阵列信号处理技术因其能够提供空域分辨能力已被广泛应用于卫星导航接收机领域以实现抗干扰和多径抑制。根据干扰和多径信号对导航接收机基带处理影响的不同提出了一种以数字相关器为界线划分的抗干扰与多径抑制两级处理结构:第一级处理在解扩前估计阵列接收数据的空时协方差矩阵,根据干扰信号功率远大于导航信号及噪声的特点利用子空间投影技术实现抗干扰;第二级处理在解扩后进行空间平滑解相干处理,利用基于Householder变换的广义旁瓣相消技术进行波束形成以实现多径抑制。理论分析和仿真结果表明,该级联处理技术能够有效地压制强干扰,并显著减小多径信号对导航接收机伪码测量的影响。

A two-stage anti-jamming and multipath mitigation method in GNSS receivers using antenna array

Array processing because of its ability to provide spatial resolution has been widely used to achieve anti-jamming and multipath mitigation in GNSS receivers. According to the different influence of interference and multipath signals to the signal processing in GNSS receivers, a two-stage anti-jamming and multipath mitigation structure divided by the correlation integrator is proposed in this paper. In the first stage, before despreading the space-time covariance matrix is estimated and anti-jamming is realized using the subspace projection method with the assumption that the interference power is far bigger than the sum of GNSS signal and noise. In the second stage, spatial smoothing is first used for multipath decoherence, and then a beamformer based on generalized sidelobe cancellation (GSC) method with householder transformer is implemented for multipath mitigation. Theoretical analysis and simulation results show that the proposed method can effectively suppress the strong interference and significantly reduce the GNSS receiver code ranging error induced by multipath signals.