| 双极性天线在多路径效应探测中的应用 |
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| 引用本文： | 刘畅,张鹏,孙福余,徐亚明.双极性天线在多路径效应探测中的应用[J].测绘科学,2017,42(4). |
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| 作者姓名： | 刘畅 张鹏 孙福余 徐亚明 |
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| 作者单位： | 1. 沈阳市勘察测绘研究院,沈阳,110004;2. 武汉大学测绘学院,武汉430079;精密工程与工业测量国家测绘地理信息局重点实验室,武汉430079;3. 武汉大学测绘学院,武汉,430079 |
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| 基金项目： | 国家自然科学基金项目，湖北省自然科学基金项目 |
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| 摘 要： | 多路径效应是影响卫星定位精度和稳定性的重要因素。针对多路径环境复杂多变难以进行分析的问题,该文提出了一种利用双极性天线探测多路径的方法。详细介绍了反射信号的极性特征;通过判断信号的极性可以有效地区分直射信号和反射信号。分析了通过信号极性实现多路径探测的理论:组成双极性天线的右螺旋圆极化天线和左螺旋圆极化天线能够分别输出卫星信号中的右螺旋圆极化分量和左螺旋圆极化分量,如果两个分量的载噪比差值大于一定的门槛值,就可以推断卫星信号在传输过程中经历了多路径效应。最后通过仿真实验验证了该方法的可行性和有效性。
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| 关 键 词： | 双极性天线 多路径效应 右螺旋圆极化 左螺旋圆极化 |
Application of dual-polarization antenna in multipath effect detection |
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| LIU Chang,ZHANG Peng,SUN Fuyu,XU Yaming.Application of dual-polarization antenna in multipath effect detection[J].Science of Surveying and Mapping,2017,42(4). |
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| Authors: | LIU Chang ZHANG Peng SUN Fuyu XU Yaming |
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| Abstract: | Multipath effect is an important factor which deeply affects the accuracy and stability of satellite positioning.Aiming at the difficulty of analyzing the multipath effect due to its changeable characteristics,this paper proposed a multipath effect detection method with the support of dual-polarization antenna.The polarization character of reflected signals was introduced;the signal polarization judgement could be a valid method to distinguish direct signals between reflected signals.The theory of multipath effect detection by dual-polarization antenna was analyzed:the dual-polarization antenna is composed of right-hand circular polarized (RHCP) and left-hand circular polarized (LHCP) antennas,which can separately output the RHCP and LHCP elements of satellite signals;if the carrier noise ratio difference of these two elements is bigger than a certain threshold,it can be concluded that the satellite signal was suffering multipath effect during its transmission.Simulation experimental results proved the validity of the proposed method. |
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| Keywords: | dual-polarization antenna multipath effect righthand circular polarized (RHCP) left hand circular polarized (LHCP) |
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