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面向星载激光测高仪的陆地目标响应函数的时间分布是评价星载激光测高仪使用性能的重要因素。根据星载激光测高仪发射的高斯激光束和目标响应函数的分布特点,采用等间隔同心圆环与等分圆周的方法实现目标的离散化三角网格划分,基于三角网格的均匀性与目标响应函数特征参数的误差模型,以目标响应函数的仿真误差指标为依据,提出一种全新的目标响应函数的时空域参数选取方法。以对地观测星载激光测高仪GLAS的系统参数为输入条件,针对三种典型倾斜度(3°、12.5°和28.5°)的平面目标和多平面目标,通过限定目标响应函数特征参数的2%容限误差,仿真了对应的波形分布,并解算出其特征参数的最大误差不超过1.16%,有效验证了陆地目标响应函数仿真方法的正确性。所得结果对于星载激光测高仪接收脉冲回波的分析、数据反演及其性能评价具有一定的实际应用价值。
The time distribution of land target response functions for satellite laser altimeters is an important factor to evaluate the performance of spaceborne laser altimeters. According to the distribution characteristics of the Gaussian laser beam and the target response function emitted by the satellite laser altimeter, the triangular triangulation of the target is achieved by the method of equidistant concentric rings and equidistant circles. Based on the uniformity of the triangular grid and The error model of the target response function characteristic parameter is proposed based on the simulation error index of the target response function and a new method for selecting the parameters of the target response function in the space-time domain is proposed. Based on the system parameters of the spaceborne laser altimeter GLAS, aiming at three kinds of plane targets and multi-plane targets with typical inclination (3 °, 12.5 ° and 28.5 °), by defining the parameters of the target response function 2% tolerance error, the corresponding waveform distribution is simulated and the maximum error of its characteristic parameters is calculated to not more than 1.16%, which validates the correctness of the simulation method of the land target response function. The results obtained for the satellite laser altimeter receive pulse echo analysis, data inversion and performance evaluation has a certain practical value.