激光高度计地面定标模拟系统设计

Design of Ground Calibration Simulation System of Laser Altimeter

星载激光高度计广泛地用于多种地形地貌的科研分析,例如冰层和植被覆盖变化.针对星载激光高度计数据的定量化应用,研究了激光高度计的定标方法,并设计了激光高度计地面定标模拟系统加以验证。该系统包含探测器阵列和高精度脉冲计时系统两部分,用于定标星载激光高度计的对地指向角和时间戳。对定标系统的性能进行实验测试和软件仿真,结果显示:探测器能够探测平均能量3 nJ/cm^2的光斑,探测范围为1~16 nJ/cm^2,计时系统计时精度为1.25 ns。

The space-borne laser altimeter can be widely used in a variety of scientific research of topography, such as ice sheet and vegetation cover change. For quantitative application of the space-borne laser altimeter data, the ground-based laser altimeter calibration method was investigated and a laser altimeter ground-based simulation system was designed. The system consists of detector arrays and high precision timing system for the verification of laser altimeter pointing angle and timing. The performance of the system is tested in the laboraroty and simulated by software. Resuts show that the detector can detect the spot of average energy 3 nJ/cm2, and detection range is 1-16 nJ/cm2 with timing accuracy of 1.25 ns.