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- 2018
低轨卫星星载GNSS反射事件模拟分析
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Abstract:
基于低轨（low earth orbit，LEO）卫星星载GNSS反射事件的数学判据，分别用BDS、GPS、Galileo、GLONASS和4系统耦合GNSS星座模拟信号源，仿真分析了LEO卫星轨道高度、轨道倾角、下视天线视场角等参量对反射事件数量和时空分布的影响；进而研究了用上述4大GNSS系统进行GNSS反射信号遥感技术（GNSS reflectometry，GNSS-R）探测对接收机通道数量的需求。统计结果表明：LEO卫星轨道越高，天线视场越大，反射事件越多，镜面反射点分布越稠密；轨道倾角越小，反射事件镜面点越趋于赤道地区分布；GNSS-R接收机所需通道数随LEO卫星轨道高度和下视天线视场范围增大而增加；而LEO卫星轨道倾角变化对通道数需求影响不明显。研究结果对GNSS-R低轨卫星系统设计具有一定的理论参考价值
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