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Variable length LMS adaptive filter for carrier phase multipath mitigation

机译：用于载波相位多径缓解的可变长度LMS自适应滤波器

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摘要

Multipath on carrier phase measurements is among the major error sources for short baseline positioning. A new method is proposed to improve the accuracy of the positioning results by mitigating the multipath effects on carrier phase measurements using the variable length Least Mean Square (VLLMS) adaptive filter. The performance of the filter is analyzed as well as compared with that of the standard LMS adaptive filter using a set of carrier phase observation data of two consecutive days collected in a short baseline experiment. Because the two antennas are static, the multipath error is the only dominant component in the carrier phase double-differenced residuals and indicates a repeated pattern. The numerical results show that both filters can significantly mitigate the multipath effects in carrier phase double-differenced residuals, and hence improve the positioning results. Furthermore, the VLLMS filter that reduces up to about 47.4% of the multipath effects on 3D positioning performs better than the LMS filter that only reduces 22.0%. Both filters are suitable for real-time applications.
机译：载波相位测量中的多径是短基线定位的主要误差源之一。提出了一种新方法，通过使用可变长度最小均方（VLLMS）自适应滤波器来减轻多径对载波相位测量的影响，从而提高定位结果的准确性。使用短基线实验中收集的连续两天的一组载波相位观测数据，分析并与标准LMS自适应滤波器进行比较。由于这两个天线是静态的，因此多径误差是载波相位双差残差中唯一的主要成分，并表示重复的模式。数值结果表明，两个滤波器都可以显着减轻载波相位双差分残差中的多径效应，从而改善定位效果。此外，在3D定位上最多减少约47.4％的多路径影响的VLLMS过滤器比仅减少22.0％的LMS过滤器性能更好。两种滤波器均适用于实时应用。

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