Multiple carrier correlators based carrier phase multipath mitigation technique for real time kinematic

R. Hang, Zhang Lei, Liu Shuo, Liu Feng
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Abstract

Mitigating carrier phase multipath errors continue to be a significant challenge for Real Time Kinematic (RTK) using Global Navigation Satellite Systems (GNSS). As the multipath error is dependent on the operational environment and therefore cannot be mitigated by differencing techniques, we propose a Multiple Carrier Correlators based carrier phase multipath mitigation technique (MCC) for the high precise positioning in the environment with multipath. In the method, two extra carrier correlators at the phases of pi/4 and −pi/4 are introduced and a maximum likelihood estimator is developed based on these correlator outputs to estimate the carrier phase of the line-of-sight signal. A Monte Carlo simulation is carried out to evaluate the carrier phase measuring accuracy of the proposed method under multipath. The experiments using real GNSS signal data are also conducted in a certain multipath scenario and an urban canyon area with random multipath. The results show the proposed method can greatly improve the performance of Real Time Kinematic positioning in the situation with multipath and outperforms the traditional multicorrelator based carrier phase multipath mitigation method.
基于多载波相关器的实时载波相位多径缓解技术
减轻载波相位多路径误差仍然是使用全球导航卫星系统(GNSS)的实时运动学(RTK)面临的重大挑战。由于多径误差依赖于操作环境,因此无法通过差分技术来缓解,针对多径环境下的高精度定位,提出了一种基于多载波相关器的载波相位多径缓解技术(MCC)。在该方法中,在pi/4和- pi/4相位处引入两个额外的载波相关器,并基于这些相关器的输出开发了一个极大似然估计器来估计视距信号的载波相位。通过蒙特卡罗仿真验证了该方法在多径条件下的载波相位测量精度。利用真实GNSS信号数据,在一定多径场景和随机多径的城市峡谷地区进行了实验。结果表明,该方法可以大大提高多径情况下的实时运动定位性能,优于传统的基于多相关器的载波相位多径缓解方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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