多径误差是GPS定位主要误差源之一。目前采用自适应天线阵抑制多径信号多针对单信源且假定直达信号和多径信号方位已知。文中将相干环境下方位估计和多波束形成抗干扰相结合,在基于相干解耦最大似然方法(CDEML)对GPS各工作卫星直达信号和多径信号方位估计的基础上,对GPS各工作卫星采用多约束最小方差波束形成器(MCMVB)技术,使各方向图在直达信号方向获得大增益的同时有效抑制多径信号。仿真结果表明该方法的有效性。

Multi-path error is one of the main error sources of GPS positioning. The current multi-path mitigation technology based on adaptive antenna array is suitable for single source and the position of direct signal and of multi-path signal that are given. A new multi-path mitigation technology combines the direction estimation in coherent environment and multi-beam forming anti-jamming method. First, the positions of direct signal and multi-path signals of GPS satellite were estimated based on CDEML, and MCMVB was used to obtain big gain of the direction of direct signal while restrain multi-path signals effectively. The computer simulation confirms the availability of the algorithm.