CAJ | 학술논문

星载激光测高仪通过接收经地表反射的微弱激光脉冲回波，计算卫星与地表的距离；结合卫星位置和姿态数据，生成激光脚点精确地理位置和高程结果。对于高程精度10 cm量级的对地观测激光测高仪，必须对影响严重的姿态角系统误差进行标定和校正。文中推导得出星载激光测高仪姿态角误差与已知地表先验信息相关联的数学模型，设计了利用大洋表面作为地表标定场，通过卫星姿态机动方式，最小二乘估计算法校正卫星在轨系统误差的具体方法。仿真结果表明，所设计的方法能够准确估计存在的姿态系统误差，即使大规模观测值丢失，估计偏差也小于5%。这种在轨运行系统误差的标定方法对于对地观测星载激光测高仪的姿态误差检校具有参考意义。
성재격광측고의통과접수경지표반사적미약격광맥충회파，계산위성여지표적거리；결합위성위치화자태수거，생성격광각점정학지리위치화고정결과。대우고정정도10 cm량급적대지관측격광측고의，필수대영향엄중적자태각계통오차진행표정화교정。문중추도득출성재격광측고의자태각오차여이지지표선험신식상관련적수학모형，설계료이용대양표면작위지표표정장，통과위성자태궤동방식，최소이승고계산법교정위성재궤계통오차적구체방법。방진결과표명，소설계적방법능구준학고계존재적자태계통오차，즉사대규모관측치주실，고계편차야소우5%。저충재궤운행계통오차적표정방법대우대지관측성재격광측고의적자태오차검교구유삼고의의。
The range between satellite and surface target was acquired by processing the weak received waveform which was transmitted from the space-borne laser altimeter and reflected by earth surface. Combined with the precise orbit and attitude data, the accurate location and elevation of laser footprint were calculated. As for the altimeter with elevation accuracy of 10 cm magnitude, the systematic error on attitude angles influencing the accuracy severely should be calibrated effectively. The analytic model of attitude angle error associated with priori knowledge of earth surface was deduced, and the calibration method used to eliminate the attitude error was designed, which utilized the ocean surface as calibration field, was by way of satellite attitude maneuver and based on least squares estimation algorithm. The results of simulation show that the designed method can estimate the systematic error precisely and effectively, even if the mass observed data were lost, the estimated bias is less than 5%. This on-orbit calibration method is beneficial to the systematic error correction for the space-borne laser altimeter, and is of reference significance.