The Earth rotates on its axis, so that a fixed aerial upon the surface of the Earth will scan a complete circle of the sky in the course of a day. 地球绕轴自转,因此地球表面上的一根固定天线在一天中能将整个天空扫描一圈。
The Finite Element Modal Analysis and Structural Dynamic Adjustment of a Fixed Wing Super-Mini Aerial Vehicle 超小型固定翼飞行器的有限元模态分析及结构动力的调整