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1·ABSOLUTE ALTITUDE, the actual distance the aircraft is above the ground.

绝对高度，飞机离地面的实际距离。

2·The calculation and simulation programs were also developed. The relations between the ground targets' absolute altitude and system parameters in a single flight period were analyzed in detail.

对单个飞行周期内地面目标的绝对高程精度与系统状态参数之间的关系进行了详细分析。