激光测高仪接收信号波形模拟器  

Waveform Simulator of Return Signal for Laser Altimeter

作　　者：周辉[1] 李松[2] 

机构地区：[1]武汉大学测绘科学与技术学院,湖北武汉430079 [2]武汉大学电子信息学院,湖北武汉430079

出　　处：《中国激光》2006年第10期1402-1406,共5页Chinese Journal of Lasers

基　　金：地球空间环境与大气测量教育部重点实验室开放研究基金资助项目

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。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.

关 键 词：测量 激光测高仪 接收脉冲信号 目标响应函数 网格划分 

分 类 号：TN249[电子电信—物理电子学] P216[天文地球—测绘科学与技术]