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针对星载激光测高系统,提出一种基于自然地物表面测距残差分析的星载激光测高仪系统误差的在轨检校方法,该方法在已知地表先验模型的前提下推导出测距模型,根据推导的测距模型利用测距残差分析,对激光指向角误差及测距误差进行检校.相较于海洋扫描的测距残差分析方法,该方法利用了残差分析进行检校,但检校场不再局限于平静的海面,且避免了姿态机动;相较于自然地物表面的检校方法,利用了自然地物表面作为检校场,建立的误差模型更直观地反映出激光指向角对测距值的影响.仿真结果表明:该方法能较好地对激光指向角误差及测距误差进行检校,使假定系统误差值与系统误差检校值的偏差值优于12%.
Aiming at the spaceborne laser altimetry system, an in-orbit calibration method based on the systematic error of the spaceborne laser altimeter based on the residual analysis of the surface object distance of natural objects is proposed. The method is deduced on the premise of knowing the terrain model The distance measurement model is used to calibrate the laser pointing error and the distance measurement error based on the derived distance measurement model.Compared with the marine scanning distance measurement residual analysis method, this method uses the residual Analysis of the school, but the school is no longer confined to the calm sea surface, and to avoid the gesture maneuver; compared with the natural surface of the calibration method, the use of the natural surface as a check ground, the error model is more intuitive The simulation results show that this method can calibrate the laser pointing angle error and the distance measurement error well, and the deviation between the assumed system error value and the system error calibration value Better than 12%.