中国激光, 2006, 33 (10): 1402, 网络出版: 2006-10-31
激光测高仪接收信号波形模拟器
Waveform Simulator of Return Signal for Laser Altimeter
测量 激光测高仪 接收脉冲信号 目标响应函数 网格划分 measurement laser altimeter return pulse signal target response function gridding partition
摘要
分析了激光测高系统中接收信号的建立过程及其相关物理量;在忽略大气对激光脉冲的影响下,推导出接收信号和目标响应函数的理论模型,表明了接收信号可以看作是发射信号与目标响应函数的卷积。以现有的测高系统(GLAS)为例,采用网格划分的方法,将目标模型离散化,进而模拟出不同观测角及目标模型情况下的接收信号波形。同时将模拟波形的输出参数与测高仪理论计算得到的参数进行了比较,结果发现:模拟接收波形的脉宽与理论计算的脉宽吻合度达99.5%;模拟波形的总光子数与国际上GSFC模拟器得到的总光子数仅相差0.4%;脉冲重心对应的高度值与实际设定的高度值仅相差1%。从而验证了该方法的正确性和可靠性。
Abstract
The establishing process and physical parameters for return signal in the laser altimeter systems are analyzed simply. Under the circumstance that the influence of atmosphere on laser pulse is ignored, the models of return signals and target response function are concluded, which indicates that return signals can be look as the convolution of transmission signal and target response function. In terms of existent laser altimeter—geoscience laser altimeter system (GLAS), the return signals for different observation angles and target models are simulated according to the ways of gridding partition. The simulated output parameters are compared with parameters of computing by using theoretical way. The results show that the agreement of pulse width is 99.5%, the difference about the total number of photonelectron between this paper and GSFC is 0.4%, the difference between the height for barycenter of pulse and actual supposed height is 1%. It proves that the way is correct and reliable.
周辉, 李松. 激光测高仪接收信号波形模拟器[J]. 中国激光, 2006, 33(10): 1402. 周辉, 李松. Waveform Simulator of Return Signal for Laser Altimeter[J]. Chinese Journal of Lasers, 2006, 33(10): 1402.