| 地基北斗GEO卫星直反信号功率测量偏差分析 |
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| 引用本文： | 阮宏梁,洪学宝,王永宁,汉牟田,杨东凯.地基北斗GEO卫星直反信号功率测量偏差分析[J].北京航空航天大学学报,2023,49(4):825-831. |
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| 作者姓名： | 阮宏梁 洪学宝 王永宁 汉牟田 杨东凯 |
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| 作者单位： | 1.金华职业技术学院 商学院，金华 321017 |
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| 基金项目： | 浙江省基础公益研究计划(LGN19D040001) |
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| 摘 要： | 针对接收天线方向性造成的北斗地球同步轨道（GEO）卫星直反信号功率测量偏差进行研究。给出地基场景下实际天线接收的直反信号及其功率表达式，讨论天线方向性造成的北斗GEO卫星直反信号功率测量相对偏差，设置具体观测场景进行仿真分析。理论与仿真结果表明：具体场景和时刻下的北斗GEO卫星直反信号功率测量偏差为固定偏差，由天线对干扰信号的抑制性能、天线架设高度和反射面介电常数共同决定；相对偏差的大小随着天线对干扰信号抑制性能的增强而减小，随着天线架设高度的变化在某一范围内波动，也会随着反射面介电常数的变化而变化。
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| 关 键 词： | 全球导航卫星反射信号测量技术 北斗卫星导航系统 地球同步轨道卫星 功率测量偏差 天线方向性 |
| 收稿时间： | 2022-02-18 |
Power measurement deviations of direct and reflected signals from BDS GEO satellites in ground-based GNSS-R applications |
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| Affiliation: | 1.Business School，Jinhua Polytechnic，Jinhua 321017，China2.Research Institute for Frontier Science，Beihang University，Beijing 100191，China3.Jinhua Branch，China United Network Communication Co.，Ltd.，Jinhua 321017，China4.School of Electronics and Information Engineering，Beihang University，Beijing 100191，China |
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| Abstract: | This paper analyzes the power measurement deviations of the direct and reflected signals from BDS GEO satellites. Firstly, the expressions of direct and reflected BDS GEO signals received by actual antennas in ground-based scenario are presented. Then, the relative deviations of direct and reflected signal power measurement of BDS GEO satellite are discussed. Finally, simulations were carried out to analyze relative deviations in a specific observation scenario. Both theory and simulation show that the power measurement deviation of the direct and reflected BDS GEO signals are fixed under a specific scene and at a given time. The deviations are codetermined by the suppression performance of the antenna to the interference signals, antenna height and the dielectric constant of the reflector. The relative deviation decreases with the enhancement of the suppression performance of the antenna to the interference signal, fluctuates within a certain range with the change of the antenna height, and varies with the dielectric constant of the reflector. |
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