Asynchronous Lidar: Proof-of-concept simulation and demonstration tests

Craig L. Glennie , Luyen K. Bui , Francisco Haces-Garcia , Derek D. Lichti
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Abstract

This study proposes an asynchronous airborne lidar design in which the laser transmitter and detectors/receivers are disconnected and carried on separate platforms. This design is more advantageous than conventional synchronous lidar systems operating in monostatic mode because redundant lidar observations can be captured. First, proof-of-concept experiments are conducted based on Monte Carlo simulations assuming a transmitter is combined with different numbers of receivers. In this way, different receiver configurations, i.e., the locations of the transmitter and receivers relative to each other, are tested with both single beam (nadir and slant range) and multi beam transmitters. Networks with the transmitter, receivers, and ground point forming a plane result in very high dilution of precision corresponding to high ground point uncertainties, which are weak configurations and should be avoided. A laboratory demonstration of an asynchronous lidar system is also presented. The results from the lab demo validate the observations made by the simulation studies. Networks with three or four receivers appear to be a reasonable balance between the number of receivers used and the ground point uncertainties. Ground point uncertainties are also dependent on the transmitter and receiver flight altitudes; multi beam simulations of four-receiver networks with varying transmitter/receiver flight heights show that the horizontal uncertainties are almost completely dependent on the transmitter flight altitude, however, both flight altitudes affect the vertical uncertainty with the receiver flight altitude having a greater influence. The best configuration with the lowest uncertainties is obtained by maximizing the ratio of transmitter height to receiver height.
异步激光雷达:概念验证仿真和演示测试
本研究提出了一种异步机载激光雷达设计,其中激光发射器和探测器/接收器断开连接并在单独的平台上进行。这种设计比传统的同步激光雷达系统在单站模式下更有利,因为可以捕获冗余的激光雷达观测。首先,基于蒙特卡罗模拟进行了概念验证实验,假设发射机与不同数量的接收器相结合。通过这种方式,用单波束(最低点和倾斜范围)和多波束发射机测试不同的接收机配置,即发射机和接收机相对于彼此的位置。发射机、接收机和接地点形成一个平面的网络,由于接地点的不确定性大,导致精度的稀释非常大,这是一种弱配置,应该避免。本文还介绍了一种异步激光雷达系统的实验室演示。实验室演示的结果验证了模拟研究的观察结果。具有三个或四个接收器的网络似乎是所使用的接收器数量和接地点不确定性之间的合理平衡。地面点的不确定性还取决于发射机和接收机的飞行高度;不同飞行高度的四接收机网络多波束仿真表明,水平不确定性几乎完全依赖于发射机飞行高度,但两种飞行高度都会影响垂直不确定性,其中接收机飞行高度的影响更大。通过最大化发射机高度与接收机高度之比,可以获得具有最小不确定性的最佳配置。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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CiteScore
5.10
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