下视天线参数对地基反射事件影响分析  

Analysis of Impact of Downward Antenna Parameters on Ground-based Reflection Events

作　　者：杜毅 杨东凯[2] 孙艺轩[2] DU Yi;YANG Dongkai;SUN Yixuan(State Key Laboratory of Geo-Information Engineering,Xi’an 710054,China;Beihang University,Beijing 100191,China)

机构地区：[1]地理信息工程国家重点实验室,陕西西安710054 [2]北京航空航天大学,北京100191

出　　处：《无线电工程》2020年第4期328-334,共7页Radio Engineering

基　　金：地理信息工程国家重点实验室开放基金(SKLGIE2017-Z-2-3)。

摘　　要：针对地基全球导航卫星系统(Global Navigation Satellite System,GNSS)反射信号应用中下视天线参数影响反射事件数量的问题,给出了地基反射事件几何关系和判断准则。通过绘制镜面反射点轨迹、计算反射事件时间覆盖率,验证了下视天线参数会影响GNSS反射事件数量。结果表明,方位角对反射事件时间覆盖率的影响幅度为44.524%;反射事件数量随下倾角和视场角的增大递增,下倾角由30°增加到90°的过程中,反射事件时间覆盖率增幅为59.393%,平均增长率为1.126%,视场角由10°增加到80°的过程中,反射事件时间覆盖率增幅为98.855%,平均增长率为1.433%。分析验证了下视天线参数对地基反射事件数量的影响,并给出了不同参数的影响率。According to the fact that the downward antenna parameters affect the number of reflection events in ground-based GNSS reflection application,the geometric relationship and judgment criteria of the ground-based reflection events are given.The impact of the downward antenna parameters on the number of GNSS reflection events is verified by plotting the specular reflection point trajectory and calculating the time coverage of the reflection event.The results indicate that the time coverage of the reflection event varies by 44.524%with the azimuth angle of the downward antenna.The number of reflection events increases with the downtilt angle and the field angle.With the downtilt angle increasing from 30°to 90°,the time coverage of the reflection event increases by 59.393%and the average growth rate is 1.126%.With the field angle increasing from 10°to 80°,the time coverage of reflection events increases by 98.855%and the average growth rate is 1.433%.The analysis verifies the influence of the lower antenna parameters on the number of ground reflection events and gives the influence rate of different parameters.

关 键 词：全球导航卫星系统 反射事件 下天线参数 地基 

分 类 号：P228.9[天文地球—大地测量学与测量工程;天文地球—测绘科学与技术]