基于联合角度—时延估计的多径信号抑制方法

Multipath mitigation method of GNSS signals based on joint angle-time delay estimation

为减小卫星导航信号受到多径干扰的影响,提出基于联合角度—时延估计的抑制多径干扰方法。该方法采用检测和比较多路信号相对时延的方法来区分直达和多径信号,设定最小时延对应的入射角为期望波达方向,并通过波束形成来抑制多径信号,从而达到减小多径误差的目的。仿真结果显示,该方法在直达信号较强和较弱的环境下能有效抑制多径影响。

The paper presents a method for multipath mitigation. Firstly, the direct signal and mul- tipath signals are distinguished by detecting and comparing the relative delay of several received sig- nals. Secondly , the minimum delay for the corresponding angle is set to the desired DOA. Thirdly, multipath signals are mitigated by beamforming. Simulation results show that the method can effec- tively mitigate multipath signals under the good or bad communications environment.