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建立了数学物理模型,理论分析了单光束垂直入射和多光束“品”字形入射时,卫星姿态控制误差及飞行速度对星载激光测高仪测量精度的影响,推导了测距误差的数学表达式,并进行数值模拟研究。文中以光束往返时间1/300 s为例,研究了为达到1 m测距精度,卫星姿态控制误差需满足的误差区间,并定性讨论了卫星飞行速度对测量精度的影响。研究结果说明:卫星姿态控制误差直接影响星载激光测高仪的测量精度,但随着斜入射光束方位的不同,俯仰误差与滚转误差对测距精度的影响程度会发生变化;若测距光束传播方向与卫星飞行速度有相同方向分量,则卫星飞行速度的影响必须加以考虑。
The mathematic model is established. The influence of satellite attitude control error and flight velocity on the measurement accuracy of spaceborne laser altimeter is analyzed theoretically when the single beam is incident perpendicularly and the multi-beam “” character is incident. The measurement error Mathematical expressions, and numerical simulation. Taking the rounding time 1/300 s as an example, the error interval to be met in order to reach 1 m ranging accuracy and satellite attitude control error is studied, and the influence of satellite flight speed on the measurement accuracy is discussed qualitatively. The results show that satellite attitude control error directly affects the accuracy of spaceborne laser altimeters. However, with the different azimuths of oblique incident beams, the influence degree of pitch error and roll error on ranging accuracy will change. If the distance The direction of propagation of the light beam has the same directional component as the speed of the satellite, the impact of the velocity of the satellite must be taken into account.