该map坐标系是一个世界固定坐标系，其Z轴指向上方。
The coordinate frame called map is a world fixed frame, with its Z-axis pointing upwards.
绝对定位，其中元素被给定相对于文档左上角的固定坐标位置。
Absolute positioning, in which the element is given a fixed coordinate position relative to the upper-left corner of the document.
旋翼阻抗由旋翼在固定坐标系中的运动方程得到，这个运动方程由旋翼旋转坐标系中的桨叶模态方程导出。
The rotor impedance is calculated from the rotor equations of motion in the fixed- coordinate system derived from the modal equations of blade in the rotating-coordinate system.
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