| GPS多路径重复性试验研究 |
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| 引用本文： | 钟萍,袁林果,丁晓利.GPS多路径重复性试验研究[J].测绘科学,2010,35(2):43-45,26. |
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| 作者姓名： | 钟萍 袁林果 丁晓利 |
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| 作者单位： | 西南交通大学,土木工程学院测量工程系,成都,610031;香港理工大学土地测量与地理咨询学系,香港,九龙;香港理工大学土地测量与地理咨询学系,香港,九龙 |
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| 基金项目： | 香港特别行政区研究资助局项目，西南交通大学科研启动基金 |
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| 摘 要： | 信号衍射和多路径效应是限制GPS定位精度进一步提高的瓶颈,观测中两者往往同时存在。衍射效应具有不完全重复的特性,为了研究多路径重复性并使其不受信号衍射的影响,本文提出先应用SIGMA-Δ信噪比加权模型削弱信号衍射的影响,再运用改进恒星时滤波法分析多路径重复性。实验观测资料分析表明,SIGMA-Δ模型能有效削弱衍射信号对定位结果影响,并且保留主要的多路径信号;而改进恒星时滤波法能适应测站周围多路径环境的变化,从而最大限度地削减多路径误差。两者组合比传统的恒星时滤波更能有效提高GPS的动态定位精度。
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| 关 键 词： | GPS 多路径效应 衍射 重复性 改进恒星时滤波 |
Experimental analysis of GPS multipath day-to-day repeatability |
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| ZHONG Ping,YUAN Lin-guo,DING Xiao-li.Experimental analysis of GPS multipath day-to-day repeatability[J].Science of Surveying and Mapping,2010,35(2):43-45,26. |
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| Authors: | ZHONG Ping YUAN Lin-guo DING Xiao-li |
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| Abstract: | Signal diffraction and multipath disturbance are bottleneck problems that limit accuracy of Global Positioning System (GPS) positioning,both of which tend to exist simultaneously.However,the day-to-day repeatability of signal diffraction is not obvious.To take advantage of the day-to-day repeating property of GPS multipath signals and make it not affected by diffraction effects,this paper used the stochastic SIGMA-△ model to reduce the effects of signal diffraction and then applied the modified sidereal filtering to analyze the multipath repeatability.Experiments with real GPS observations showed that the SIGMA-△ model could achieve a balance between reducing the diffraction effects and keeping the main multipath signals.The modified sidereal filtering used time-varying and site-dependent shifts to fully mitigate the multipath errors.It was shown that integrating the two techniques was more effective in improving the dynamic GPS accuracy than the traditional sidereal filtering. |
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| Keywords: | GPS GPS multipath effects diffraction repeatability modified sidereal filtering (MSF) |
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