求翻译：若飞机在xoy平面的坐标固定为（90, 90），但高度从1km变化到10km，得到GDOP随飞机高度变化的三维图，如图9所示；而图10则表示飞机高度从1km变化到30km时，GDOP值的变化情况。是什么意思？

Coordinates the aircraft xoy plane fixed (90, 90), but the height from 1km to 10km to get gdop three-dimensional map with the aircraft altitude changes, as shown in Figure 9; Figure 10 indicates that the aircraft altitude change from 1km to 30km, gdop value changes.

If you aircraft in the coordinate plane xoy fixed (90, 90), but high from 1 KM to 10 KM, the aircraft was GDOP height changes of 3D figure, as shown in Figure 9 and figure 10 indicates that aircraft height changes from 1 KM to 30 km, GDOP changes in the value of.

If the airplane fixes in the xoy plane coordinates for (90, 90), but changes highly from 1km to 10km, obtains GDOP along with the aircraft altitude change graphic model, as shown in Figure 9; When Figure 10 piece of expression aircraft altitude changes from 1km to 30km, GDOP value change situation.

If the aircraft fixed to the xoy plane coordinates (90, 90), but the height change from 1km to 10km received GDOP three dimensional figure over aircraft height, as shown in Figure 9; figure 10 indicates that the aircraft height changes from 1km to 30km, the GDOP values change.

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