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Array-aided single-frequency state-space RTK with combined GPS, Galileo, IRNSS, and QZSS L5/E5a observations 结合GPS、Galileo、IRNSS和QZSS L5/E5a观测的阵列辅助单频状态空间RTK
Pub Date : 2017-11-01 DOI: 10.1061/(ASCE)SU.1943-5428.0000227
Wei Li, N. Nadarajah, P. Teunissen, A. Khodabandeh, Yanju Chai
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引用次数: 10
Comparison of MEMS-based and FOG-based IMUs to determine sensor pose on an unmanned aircraft system 基于mems和基于fog的imu在无人机系统传感器位姿确定中的比较
Pub Date : 2017-11-01 DOI: 10.1061/(ASCE)SU.1943-5428.0000225
D. Gautam, A. Lucieer, Z. Malenovský, C. Watson
Small-sized unmanned aircraft systems (UAS) are restricted to use only lightweight microelectromechanical systems (MEMS)- based inertial measurement units (IMUs) due to their limited payload capacity. Still, some UAS-based geospatial remote sensing applications, such as airborne spectroscopy or laser scanning, require high accuracy pose (position and orientation) determination of the onboard sensor payload. This study presents ground-based experiments investigating the pose accuracy of two MEMS-based IMUs: the single-antennaMTi-G-700 (Xsens, Enschede, Netherlands) and the dual-antenna/dual-frequency Spatial Dual IMU (Advanced Navigation, Sydney, Australia)/global navigation satellite system (GNSS).A tightly coupled and postprocessed pose solution froma fiberoptic gyroscope (FOG)-based NovAtel synchronized position attitude navigation (SPAN) IMU (NovAtel, Calgary, Canada) served as a reference to evaluate the performance of the two IMUs under investigation. Results revealed a better position solution for the Spatial Dual, and the MTi-G-700 achieved a better roll/pitch accuracy. Most importantly, the heading solution from the dual-antenna configuration of the Spatial Dual was found to be more stable than the heading obtained with the reference SPANIMU.
小型无人机系统(UAS)由于载荷能力有限,只能使用基于微机电系统(MEMS)的轻型惯性测量单元(imu)。然而,一些基于无人机的地理空间遥感应用,如机载光谱或激光扫描,需要机载传感器有效载荷的高精度姿态(位置和方向)确定。本研究通过地面实验研究了两种基于mems的IMU的位位精度:单天线namti - g -700 (Xsens, Enschede,荷兰)和双天线/双频空间双IMU (Advanced Navigation, Sydney, Australia)/全球导航卫星系统(GNSS)。基于光纤陀螺仪(FOG)的NovAtel同步位置姿态导航(SPAN) IMU (NovAtel, Calgary, Canada)的紧密耦合和后处理姿态解决方案作为评估所研究的两个IMU性能的参考。结果表明,MTi-G-700具有更好的位置解决方案,并且实现了更好的滚转/俯仰精度。最重要的是,空间双天线结构的航向解比参考SPANIMU的航向解更稳定。
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引用次数: 11
Kalman Filtering–Based Real-Time Inertial Profiler 基于卡尔曼滤波的实时惯性轮廓仪
Pub Date : 2017-11-01 DOI: 10.1061/(ASCE)SU.1943-5428.0000234
Yu Cai
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引用次数: 2
Rigorous Estimation of Local Accuracies Revisited 再论局部精度的严格估计
Pub Date : 2017-11-01 DOI: 10.1061/(ASCE)SU.1943-5428.0000240
T. Soler, Jen-Yu Han
AbstractNew insights about the concept of local accuracies are elaborated in this article. Recently found evidence supports the mathematical rigor of equations previously published in this journal ...
摘要本文阐述了局部精度概念的新见解。最近发现的证据支持先前发表在该杂志上的方程的数学严谨性。
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引用次数: 0
Weighted Total Least Squares with Singular Covariance Matrices Subject to Weighted and Hard Constraints 加权硬约束下奇异协方差矩阵的加权总最小二乘
Pub Date : 2017-11-01 DOI: 10.1061/(ASCE)SU.1943-5428.0000239
A. Amiri-Simkooei
Weighted total least squares (WTLS) has been widely used as a standard method to optimally adjust an errors-in-variables (EIV) model containing random errors both in the observation vector and in the coefficient matrix. An earlier work provided a simple and flexible formulation forWTLS based on the standard least-squares (SLS) theory. The formulation allows one to directly apply the available SLS theory to the EIV models. Among such applications, this contribution formulates the WTLS problem subject to weighted or hard linear(ized) equality constraints on unknown parameters. The constraints are to be properly incorporated into the system of equations in an EIV model of which a general structure for the (singular) covariance matrix QA of the coefficient matrix is used. The formulation can easily take into consideration any number of weighted linear and nonlinear constraints. Hard constraints turn out to be a special case of the general formulation of the weighted constraints. Because the formulation is based on the SLS theory, the method automatically approximates the covariance matrix of the estimates from which the precision of the constrained estimates can be obtained. Three numerical examples with different scenarios are used to demonstrate the efficacy of the proposed algorithm for geodetic applications. DOI: 10.1061/(ASCE)SU.1943-5428.0000239.© 2017 American Society of Civil Engineers. Author keywords: Weighted total least squares (WTLS); Errors-in-variables (EIV) model; Linear equality constraints; Two-dimensional (2D) affine transformation.
加权总最小二乘(WTLS)作为一种标准方法,被广泛用于对包含观测向量和系数矩阵随机误差的变量误差模型进行最优调整。早期的工作基于标准最小二乘(SLS)理论提供了一个简单而灵活的wtls公式。该公式允许人们直接将现有的SLS理论应用于EIV模型。在这些应用中,这一贡献阐述了受未知参数加权或硬线性(化)等式约束的WTLS问题。在使用系数矩阵的(奇异)协方差矩阵QA的一般结构的EIV模型中,约束条件应适当地纳入方程组。该公式可以很容易地考虑任意数量的加权线性和非线性约束。硬约束是加权约束一般形式的一种特殊情况。由于该方法是基于SLS理论,该方法可以自动逼近估计的协方差矩阵,从而获得约束估计的精度。用三个不同场景的数值算例验证了该算法在大地测量应用中的有效性。DOI: 10.1061 /(第3期)su.1943 - 5428.0000239。©2017美国土木工程师学会。关键词:加权总最小二乘(WTLS);变量误差模型;线性等式约束;二维仿射变换。
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引用次数: 15
Monitoring and Analyzing Displacement of Large-Span Spoke-Type Cable Structure Roof 大跨度轮辐式索结构屋盖位移监测与分析
Pub Date : 2017-11-01 DOI: 10.1061/(ASCE)SU.1943-5428.0000237
Deng Hui, Li Hongyang, S. Cheng, Jiang Yiping
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引用次数: 5
Positioning Slow-Moving Platforms by UWB Technology in GPS-Challenged Areas 利用超宽带技术在gps定位困难地区定位缓慢移动平台
Pub Date : 2017-11-01 DOI: 10.1061/(ASCE)SU.1943-5428.0000231
C. Toth, G. Jóźków, Zoltán Koppányi, D. Grejner-Brzezinska
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引用次数: 23
Improved Method for Estimating the Ocean Tide Loading Displacement Parameters by GNSS Precise Point Positioning and Harmonic Analysis 基于GNSS精确点定位和谐波分析的海潮载荷位移参数估计改进方法
Pub Date : 2017-11-01 DOI: 10.1061/(ASCE)SU.1943-5428.0000222
R. Tu, Hong Zhao, Pengfei Zhang, Jinhai Liu, Xiaochun Lu
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引用次数: 5
Multiview Matching Algorithm for Processing Mobile Sequence Images 移动序列图像处理的多视图匹配算法
Pub Date : 2017-11-01 DOI: 10.1061/(ASCE)SU.1943-5428.0000235
Xiaoliang Zou, Guihua Zhao, Jonathan Li, Yuanxi Yang, Yong Fang
The paper presents a multiview matching algorithm for processing sequence images acquired by a mobile mapping system (MMS). The workflow of the multiview matching algorithm is designed, and the algorithm is based on motion analysis of sequence images in computer vision. To achieve a high multiview matching accuracy, camera lens distortion in sequence images is first corrected, and images can then be resampled. Image points on sequence images are extracted using the Harris operator. The homologous image points are then matched based on correlation coefficients and used to make a robust estimation for a fundamental matrix F between the two adjacent images using the random sample consensus (RANSAC) algorithm. The fundamental matrix F is calculated under the condition of epipolar line constraints. Finally, the trifocal tensor T of the three-view images is calculated to achieve highly accurate triplet image points. These triplet image points are then provided as the initial value for bundle adjustment. The algorithm was tested using a set of sequence images. The results demonstrate that the designed workflow is available and the algorithm is promising in terms of both accuracy and feasibility. DOI: 10.1061/(ASCE) SU.1943-5428.0000235. This work is made available under the terms of the Creative Commons Attribution 4.0 International license, http:// creativecommons.org/licenses/by/4.0/. Author keywords: Sequence images; Multiview matching; Harris operator; Correlation coefficient; Random sample consensus (RANSAC); Trifocal tensor; Computer vision (CV); Mobile mapping system (MMS).
针对移动地图系统(MMS)获取的序列图像,提出了一种多视图匹配算法。设计了基于计算机视觉中序列图像运动分析的多视点匹配算法的工作流程。为了达到较高的多视点匹配精度,首先对序列图像中的相机镜头畸变进行校正,然后对图像进行重采样。利用Harris算子提取序列图像上的图像点。然后基于相关系数匹配同源图像点,并使用随机样本一致性(RANSAC)算法对相邻图像之间的基本矩阵F进行鲁棒估计。在极线约束条件下计算基本矩阵F。最后,计算三视图图像的三焦张量T,以获得高精度的三联体图像点。然后提供这些三重图像点作为束调整的初始值。使用一组序列图像对算法进行了测试。结果表明,所设计的工作流程是可行的,该算法在精度和可行性方面都有良好的前景。Doi: 10.1061/(asce) su.1943-5428.0000235。本作品在知识共享署名4.0国际许可(http:// creativecommons.org/licenses/by/4.0/)的条款下提供。作者关键词:序列图像;多视图匹配;哈里斯算子;相关系数;随机样本一致性(RANSAC);三焦点的张量;计算机视觉(CV);移动地图系统(MMS)。
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引用次数: 0
Direct Georeferencing for Portable Mapping Systems: In the Air and on the Ground 便携式测绘系统的直接地理参考:空中和地面
Pub Date : 2017-11-01 DOI: 10.1061/(ASCE)SU.1943-5428.0000229
L. Klingbeil, C. Eling, E. Heinz, M. Wieland, H. Kuhlmann
AbstractDuring the last few years, the acquisition of geometric information about objects by using a moving sensor platform has gained increasing popularity in the surveying community. A large numb...
摘要近年来,利用移动传感器平台获取物体几何信息在测量界得到了越来越广泛的应用。一大片麻……
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引用次数: 9
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Journal of Surveying Engineering-asce
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