为满足激光测距仪在地形测绘、浅海岸探测等领域中的应用需求,设计了一套适用于机载激光测距仪的回波接收系统.该系统基于时间数字转换器技术测量设备与海表之间的绝对距离,结合模拟数字转换器技术测量多目标之间的相对距离,可实现对浅海岸地区海表和海底回波的接收和测量.针对激光回波信号与发射信号之间的时间间隔测量误差影响测距精度的问题,提出了一种自动参数控制算法,该算法能够根据回波信号自动调节电路增益和比较器阈值.同时,采用LM(Levenberg-Marquardt)算法对回波进行分解,有效提升了多目标回波分解的精度.通过搭建实验系统进行测试,结果显示该系统对单目标的距离测量均方根误差不大于2.89 cm,对双目标回波分解精度不高于2.56 cm.
Design of Echo Receiving System for Airborne Laser Rangefinder
To satisfy the application requirements of laser rangefinders in terrain mapping,shallow coastal detection,and other fields,this study proposes a set of echo reception systems suitable for airborne laser rangefinders.The system measures the absolute distance between the device and sea surface via time-to-digital technology,as well as the relative distance of multiple targets via analog-to-digital converter technology,thus enabling the reception and measurement of echoes from the sea surface and seabed in shallow coastal areas.To address the issue of ranging accuracy affected by errors in the travel time of laser echo signals,this paper proposes an automatic parameter-control algorithm that can automatically adjust the circuit gain and comparator thresholds based on the echo signal.Additionally,the Levenberg-Marquardt(LM)algorithm is used to decompose the echoes,thus effectively improving the accuracy of multitarget echo decomposition.By constructing an experimental system for testing,the results show that the root mean square error of the system for measuring single targets does not exceed 2.89 cm and the accuracy of echo decomposition for dual targets does not exceed 2.56 cm.
laser range finderautomatic parameter controlwaveform decomposition
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