基于空时盲参数估计的GPS多径干扰抑制

GPS Multipath Effect Mitigation Based on Blind Parameters Estimation

高精度GPS测量定位的主要误差源是多径效应，对系统精度的影响很大，因此提出了一种基于CDMA盲参数估计的方法。首先通过盲参数估计计算出直接信号和多径信号的时延和角度向量，然后通过空时处理对多径信号进行抑制。该方法通过了理论分析和仿真实验的验证。结果表明采用该方法的多径误差约为原来的35％。

Multipath effect is the major error source of GPS, the result is intolerable. So a method based on blind parameters estimation to mitigate it is suggested. First, the time delay and direction of arrival of direct signal and multipath interferences were estimated, then space-time adaptive processing was utilized to eliminate interferences. Theoretical analysis and simulations supported the method. The results prove that its error is 35 percent of the original one.