NLOS GPS signal detection using a dual-polarisation antenna
NLOS GPS signal detection using a dual-polarisation antenna
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DOI：
10.1007/s10291-012-0305-5
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发表时间：
2014-01-01
期刊：
影响因子：
4.9
通讯作者：
Groves, Paul D.
中科院分区：
文献类型：
--
作者：
Jiang, Ziyi;Groves, Paul D.
非视距（NLOS）接收或多径干扰形式的间接信号的接收是城市环境中GNSS定位误差的主要原因。我们探讨了使用双极化天线技术检测和减轻NLOS信号和严重的多径干扰的接收的潜力。新技术计算的载波功率噪声密度（C/N（0））测量值从左圆极化输出减去右圆极化C/N（0）对应。如果该质量是负的，则假定NLOS信号接收。如果C/N（0）差是正的，但是福尔斯低于基于其在开放天空环境中的下限的阈值，则假定严重的多径干扰。两个实验的结果。首先进行开放场测试，以验证天线的行为，并确定一个合适的多径检测阈值。然后在人口密集的城市地区测试这些技术。使用新的方法，在城市数据中的两个信号被确定为NLOS仅接收在占领期间在一个站，而大多数剩余的信号存在的NLOS接收和严重的多径干扰的混合。通过排除检测到的NLOS测量值，点定位结果得到了显着改善。根据我们的研究结果，新技术适用于广泛的静态地面应用。
The reception of indirect signals, either in the form of non-line-of-sight (NLOS) reception or multipath interference, is a major cause of GNSS position errors in urban environments. We explore the potential of using dual-polarisation antenna technology for detecting and mitigating the reception of NLOS signals and severe multipath interference. The new technique computes the value of the carrier-power-to-noise-density (C/N (0)) measurements from left-hand circular polarised outputs subtracted from the right-hand circular polarised C/N (0) counterpart. If this quality is negative, NLOS signal reception is assumed. If the C/N (0) difference is positive, but falls below a threshold based on its lower bound in an open-sky environment, severe multipath interference is assumed. Results from two experiments are presented. Open-field testing was first performed to characterise the antenna behaviour and determine a suitable multipath detection threshold. The techniques were then tested in a dense urban area. Using the new method, two signals in the urban data were identified as NLOS-only reception during the occupation period at one station, while the majority of the remaining signals present were subject to a mixture of NLOS reception and severe multipath interference. The point positioning results were dramatically improved by excluding the detected NLOS measurements. The new technique is suited to a wide range of static ground applications based on our results.