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

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。

Effects of satellite attitude control error and flying velocity on satellite laser altimeter measurement precision

A geometry model were established to analyse the effects on measurement precision by satellite attitude control error and flying velocity for both normal incidence of single pulse and non-normal incidence of multi-beam,the mathematical expression of distance measurement error was deduced,at the same time,numerical calculation was made here.In this study,the requirement for satellite control error was obtained to meet the measurement precision of 1 m when the flight time is 1/300 s.Moreover,qualitative discussion was made about the flying velocity′s effect on measurement precision.The results show that attitude control error has a direct impact on the distance measurement precision of spaceborne laser altimeter,but with the different azimuth of non-normal incidence beam,the effects on distance measurement precision by pitching error and rolling error will vary a lot;if velocity direction has common component with the propagation direction of laser pulses,the flying velocity must be taken into consideration when high precision measurement results is wanted.