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摘要: 对星载GPS-R海洋遥感接收机下视天线的波束中心指向、波束形状、波束推进方式对镜面反射点可视性的影响进行了研究. 定义了一个与天线可视区域内地球表面点具有一一对应关系的星下点平面, 提出了星下点平面内的天线波束覆盖区域的确定方法及数学表达式, 在此基础上分析了不同的波束中心指向、波束形状、波束推进方式对可视性的影响, 并根据某型号空间飞行器的轨道数据进行了仿真验证.Abstract: The influences on visibility of specular points are investigated from several properties of the spaceborne GPS-R system downward antenna in the oceanographic remote sensing, including beam center pointing, beam geometry and beam scanning manners. In particular, we firstly defined a subastral plane which has a one-to-one mapping relationship with points on the Earth in beam zone coverage; then presented a scheme to figure out beam zone coverage in this plane, and then analyzed the influences on visibility from beam center pointing, beam geometry and beam scanning manners. A configuration of beam geometry and beam scanning manners are proposed, in which the direction with larger half power beam width of the downward antenna's two main directions in the lobe pattern is vertical to the LEO satellite velocity direction in subastral plane. These research conclusions have been verified by simulation in the potential GPS-R system in the oceanographic remote sensing, based on the orbit of a LEO satellite which can be used in the future.
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