Article
Computer Science, Interdisciplinary Applications
Taylan Ocalan, Tarik Turk, Nursu Tunalioglu, Mert Gurturk
Summary: This study examines the performance of PPP and PPP-AR solutions for kinematic GNSS data obtained from UAVs, comparing them with PPK solutions based on relative positioning. The potential of the PPP-AR approach in terms of quality and accuracy in UAV photogrammetry has been demonstrated.
EARTH SCIENCE INFORMATICS
(2022)
Article
Environmental Sciences
Mustafa Zeybek, Selim Taskaya, Ismail Elkhrachy, Paolo Tarolli
Summary: This study focuses on using image-based techniques such as structure from motion (SfM) to produce high-accuracy topographic maps using unmanned aerial vehicles (UAVs) and minimal surface measurements. Real-time kinematic (RTK) has been used to increase positional accuracy to 1-3 times the ground sampling distance (GSD). The study evaluates the post-processing kinematic (PPK) approach for achieving high positional accuracy with UAV image georeferencing and assesses the impact of different flight patterns and altitudes on the accuracy of the resulting topographic maps.
Article
Chemistry, Analytical
Ryan G. Brazeal, Benjamin E. Wilkinson, Adam R. Benjamin
Summary: This study investigates the impact of using single-antenna and dual-antenna GNSS/INS MEMS sensors on the positional precision of UAS lidar-generated point clouds. The results demonstrate that dual-antenna GNSS/INS sensors can significantly improve heading precision compared to single-antenna sensors.
Article
Engineering, Multidisciplinary
Mustafa Zeybek
Summary: This study tested and compared the positional accuracy of benchmarks and point clouds produced on three consecutive days using different flight combinations at 75 and 100 m flight altitude. The results showed that UAV data can achieve acceptable positional accuracy levels without the need for GCPs.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2021)
Article
Environmental Sciences
Paul Ryan Nesbit, Stephen M. Hubbard, Chris H. Hugenholtz
Summary: Steep rock slopes provide opportunities and challenges in Earth science applications. Direct georeferencing of UAVs can generate high-resolution 3D datasets, but large vertical errors may occur in near-vertical terrains. Multiple image angles result in the highest precision, while ground control points greatly reduce mean errors.
Review
Geography, Physical
Florian Poeppl, Hans Neuner, Gottfried Mandlburger, Norbert Pfeifer
Summary: Trajectory estimation is the task of obtaining position and orientation estimates by fusion of various sensor inputs. This paper provides a unified view of trajectory estimation with a focus on its role in kinematic mapping, specifically the integration of GNSS, INS, laser scanners, and cameras, along with a survey of related literature. Recent trends and challenges in trajectory estimation are identified and discussed.
ISPRS JOURNAL OF PHOTOGRAMMETRY AND REMOTE SENSING
(2023)
Article
Environmental Sciences
Ansgar Dreier, Jannik Janssen, Heiner Kuhlmann, Lasse Klingbeil
Summary: This paper examines the quality analysis of direct georeferencing of a UAV-based laser scanning system, showing that the system has a precision of <1.2 cm in both horizontal and vertical directions, and an absolute accuracy of <2 cm horizontally and <4 cm vertically compared to TLS reference. The study also investigates the influence of different GNSS master stations, finding no significant difference between VRS and dedicated master stations.
Article
Engineering, Electrical & Electronic
Qusen Chen, Leilei Li, Keyi Xu, Xiangdong An, Yu Wu
Summary: The novel triple filtering algorithm proposed in this paper for aerial GNSS/INS integration avoids inaccuracies when the system has not reached convergence and is beneficial for engineering implementation. Through real aerial testing, the results show that DG can achieve a horizontal accuracy of 5 cm with the proposed algorithm, a 63% improvement compared to the standard extended Kalman filter.
JOURNAL OF SENSORS
(2021)
Article
Engineering, Marine
Jiajia Xiao, Ying Li, Chuang Zhang, Zhaoyi Zhang
Summary: This study proposes an innovative integrated navigation algorithm to provide reliable navigation and positioning solutions during GPS failure by predicting and correcting the differences between INS and GPS.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Environmental Sciences
Kotaro Iizuka, Takuro Ogura, Yuki Akiyama, Hiroyuki Yamauchi, Takeshi Hashimoto, Yudai Yamada
Summary: This study focuses on using unmanned aerial systems for geoscience-related studies, proposing a new method to improve model accuracy without ground control points by utilizing global navigation satellite system devices. The research suggests that this method could be a viable alternative to traditional GCP methods, especially in locations where setting multiple GCPs is difficult.
GEOCARTO INTERNATIONAL
(2022)
Article
Engineering, Multidisciplinary
Wenwei Liang, Kui Li, Qihang Li
Summary: This paper proposes an anti-spoofing integrated navigation method that detects and corrects spoofing signals received by the GPS receiver using the error propagation characteristics of inertial navigation and the Kalman filter. This method effectively improves the accuracy and robustness of integrated navigation.
Article
Agriculture, Multidisciplinary
Hasan Seyyedhasani, Matthew Digman, Brian D. Luck
Summary: The use of UAV system has proven successful in increasing accuracy and improving field capacity. Variations in flight speed and altitude have implications on both accuracy and capacity.
COMPUTERS AND ELECTRONICS IN AGRICULTURE
(2021)
Article
Engineering, Multidisciplinary
Mohsen Nezhadshahbodaghi, Mohammad Reza Mosavi
Summary: The study proposes a new INS/GPS integration system by utilizing EMD denoising technology and new versions of EMD method, addressing the issue of limited GPS signal access in challenging GPS environments and improving the signal-to-noise ratio of inertial sensor measurements. Experimental results show that the framework outperforms traditional methods in terms of accuracy and stability.
Article
Chemistry, Analytical
Carlos A. M. Correia, Fabio A. A. Andrade, Agnar Sivertsen, Ihannah Pinto Guedes, Milena Faria Pinto, Aline Gesualdi Manhaes, Diego Barreto Haddad
Summary: Optical image sensors are commonly used in Unmanned Aerial Systems (UAS) for remote sensing data acquisition. In order to assign a geographic location to the acquired image, a process called direct georeferencing is necessary. This process involves various information and transformations between reference frames, making it a complex operation. However, there is a lack of comprehensive explanation of this process in existing literature. This paper presents a detailed method for direct georeferencing of aerial images acquired by cameras mounted on UAS, providing all the required information, mathematical operations, and implementation steps. The method is validated through simulated and real flights.
Article
Engineering, Multidisciplinary
Zhuo Zhi, Datong Liu, Liansheng Liu
Summary: This article proposes a performance compensation method for GPS outages, using a wavelet regional correlation threshold denoising algorithm and a CNN-LSTM model to address MEMS-IMU issues. Experimental results show that the method can effectively improve the performance of the integrated navigation system.
