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Design and Evaluation of a Permanently Installed Plane-Based Calibration Field for Mobile Laser Scanning Systems

机译:用于移动激光扫描系统永久安装平面校准场的设计与评估

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摘要

Mobile laser scanning has become an established measuring technique that is used for many applications in the fields of mapping, inventory, and monitoring. Due to the increasing operationality of such systems, quality control w.r.t. calibration and evaluation of the systems becomes more and more important and is subject to on-going research. This paper contributes to this topic by using tools from geodetic configuration analysis in order to design and evaluate a plane-based calibration field for determining the lever arm and boresight angles of a 2D laser scanner w.r.t. a GNSS/IMU unit (Global Navigation Satellite System, Inertial Measurement Unit). In this regard, the impact of random, systematic, and gross observation errors on the calibration is analyzed leading to a plane setup that provides accurate and controlled calibration parameters. The designed plane setup is realized in the form of a permanently installed calibration field. The applicability of the calibration field is tested with a real mobile laser scanning system by frequently repeating the calibration. Empirical standard deviations of <1 ... 1.5 mm for the lever arm and <0.005 ∘ for the boresight angles are obtained, which was priorly defined to be the goal of the calibration. In order to independently evaluate the mobile laser scanning system after calibration, an evaluation environment is realized consisting of a network of control points as well as TLS (Terrestrial Laser Scanning) reference point clouds. Based on the control points, both the horizontal and vertical accuracy of the system is found to be < 10 mm (root mean square error). This is confirmed by comparisons to the TLS reference point clouds indicating a well calibrated system. Both the calibration field and the evaluation environment are permanently installed and can be used for arbitrary mobile laser scanning systems.
机译:移动激光扫描已成为一种建立的测量技术,用于映射,库存和监控领域的许多应用。由于这种系统的运作越来越多,质量控制W.R.T.系统的校准和评估变得越来越重要,并且需要进行持续研究。本文通过使用来自大地测量配置分析的工具来贡献本主题,以便设计和评估基于平面的校准场,用于确定2D激光扫描仪W.R.T的杠杆臂和触觉角度。 GNSS / IMU单元(全球导航卫星系统,惯性测量单元)。在这方面,分析了随机,系统和粗略观察误差对校准的影响,导致平面设置,提供准确和受控的校准参数。设计的平面设置以永久安装的校准字段的形式实现。校准场的适用性通过频繁重复校准,用真正的移动激光扫描系统测试。获得了杠杆臂的<1 ... 1.5mm的经验标准偏差,并为触觉角度为<0.005‰,其定义为校准的目标。为了独立评估校准后的移动激光扫描系统,实现了评估环境,由控制点网络以及TLS(地面激光扫描)参考点云组成。基于控制点,发现系统的水平和垂直精度都被发现为<10 mm(根均方误差)。这通过对TLS参考点云进行比较来确认,指示晶校准系统。校准字段和评估环境都是永久安装的,可用于任意移动激光扫描系统。

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