keyword
MENU ▼
Read by QxMD icon Read
search

UAV

keyword
https://www.readbyqxmd.com/read/28545231/atmospheric-sampling-on-ascension-island-using-multirotor-uavs
#1
Colin Greatwood, Thomas S Richardson, Jim Freer, Rick M Thomas, A Rob MacKenzie, Rebecca Brownlow, David Lowry, Rebecca E Fisher, Euan G Nisbet
As part of an NERC-funded project investigating the southern methane anomaly, a team drawn from the Universities of Bristol, Birmingham and Royal Holloway flew small unmanned multirotors from Ascension Island for the purposes of atmospheric sampling. The objective of these flights was to collect air samples from below, within and above a persistent atmospheric feature, the Trade Wind Inversion, in order to characterise methane concentrations and their isotopic composition. These parameters allow the methane in the different air masses to be tied to different source locations, which can be further analysed using back trajectory atmospheric computer modelling...
May 23, 2017: Sensors
https://www.readbyqxmd.com/read/28515537/estimating-spatially-distributed-turbulent-heat-fluxes-from-high-resolution-thermal-imagery-acquired-with-a-uav-system
#2
Claire Brenner, Christina Elisabeth Thiem, Hans-Dieter Wizemann, Matthias Bernhardt, Karsten Schulz
In this study, high-resolution thermal imagery acquired with a small unmanned aerial vehicle (UAV) is used to map evapotranspiration (ET) at a grassland site in Luxembourg. The land surface temperature (LST) information from the thermal imagery is the key input to a one-source and two-source energy balance model. While the one-source model treats the surface as a single uniform layer, the two-source model partitions the surface temperature and fluxes into soil and vegetation components. It thus explicitly accounts for the different contributions of both components to surface temperature as well as turbulent flux exchange with the atmosphere...
May 19, 2017: International Journal of Remote Sensing
https://www.readbyqxmd.com/read/28513552/a-two-echelon-cooperated-routing-problem-for-a-ground-vehicle-and-its-carried-unmanned-aerial-vehicle
#3
Zhihao Luo, Zhong Liu, Jianmai Shi
In this paper, a two-echelon cooperated routing problem for the ground vehicle (GV) and its carried unmanned aerial vehicle (UAV) is investigated, where the GV travels on the road network and its UAV travels in areas beyond the road to visit a number of targets unreached by the GV. In contrast to the classical two-echelon routing problem, the UAV has to launch and land on the GV frequently to change or charge its battery while the GV is moving on the road network. A new 0-1 integer programming model is developed to formulate the problem, where the constraints on the spatial and temporal cooperation of GV and UAV routes are included...
May 17, 2017: Sensors
https://www.readbyqxmd.com/read/28487713/mechanical-harvesting-effectively-controls-young-typha-spp-invasion-and-unmanned-aerial-vehicle-data-enhances-post-treatment-monitoring
#4
Shane C Lishawa, Brendan D Carson, Jodi S Brandt, Jason M Tallant, Nicholas J Reo, Dennis A Albert, Andrew M Monks, Joseph M Lautenbach, Eric Clark
The ecological impacts of invasive plants increase dramatically with time since invasion. Targeting young populations for treatment is therefore an economically and ecologically effective management approach, especially when linked to post-treatment monitoring to evaluate the efficacy of management. However, collecting detailed field-based post-treatment data is prohibitively expensive, typically resulting in inadequate documentation of the ecological effects of invasive plant management. Alternative approaches, such as remote detection with unmanned aerial vehicles (UAV), provide an opportunity to advance the science and practice of restoration ecology...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28481285/a-novel-real-time-reference-key-frame-scan-matching-method
#5
Haytham Mohamed, Adel Moussa, Mohamed Elhabiby, Naser El-Sheimy, Abu Sesay
Unmanned aerial vehicles represent an effective technology for indoor search and rescue operations. Typically, most indoor missions' environments would be unknown, unstructured, and/or dynamic. Navigation of UAVs in such environments is addressed by simultaneous localization and mapping approach using either local or global approaches. Both approaches suffer from accumulated errors and high processing time due to the iterative nature of the scan matching method. Moreover, point-to-point scan matching is prone to outlier association processes...
May 7, 2017: Sensors
https://www.readbyqxmd.com/read/28481277/obstacle-detection-and-avoidance-system-based-on-monocular-camera-and-size-expansion-algorithm-for-uavs
#6
Abdulla Al-Kaff, Fernando García, David Martín, Arturo De La Escalera, José María Armingol
One of the most challenging problems in the domain of autonomous aerial vehicles is the designing of a robust real-time obstacle detection and avoidance system. This problem is complex, especially for the micro and small aerial vehicles, that is due to the Size, Weight and Power (SWaP) constraints. Therefore, using lightweight sensors (i.e., Digital camera) can be the best choice comparing with other sensors; such as laser or radar.For real-time applications, different works are based on stereo cameras in order to obtain a 3D model of the obstacles, or to estimate their depth...
May 7, 2017: Sensors
https://www.readbyqxmd.com/read/28445417/ins-gnss-integration-for-aerobatic-flight-applications-and-aircraft-motion-surveying
#7
Edgar L V Hinüber, Christian Reimer, Tim Schneider, Michael Stock
This paper presents field tests of challenging flight applications obtained with a new family of lightweight low-power INS/GNSS (inertial navigation system/global satellite navigation system) solutions based on MEMS (micro-electro-mechanical- sensor) machined sensors, being used for UAV (unmanned aerial vehicle) navigation and control as well as for aircraft motion dynamics analysis and trajectory surveying. One key is a 42+ state extended Kalman-filter-based powerful data fusion, which also allows the estimation and correction of parameters that are typically affected by sensor aging, especially when applying MEMS-based inertial sensors, and which is not yet deeply considered in the literature...
April 26, 2017: Sensors
https://www.readbyqxmd.com/read/28420534/adaptive-compensation-control-for-attitude-adjustment-of-quad-rotor-unmanned-aerial-vehicle
#8
Zhankui Song, Kaibiao Sun
A compensation control strategy based on adaptive back-stepping technique is presented to address the problem of attitude adjustment for a quad-rotor unmanned aerial vehicle (QR- UAV) with inertia parameter uncertainties, the limited airflow disturbance and the partial loss of rotation speed effectiveness. In the design process of control system, adaptive estimation technique is introduced into the closed loop system in order to compensate the lumped disturbance term. More specifically, the designed controller utilizes "prescribed performance bounds" method, and therefore guarantees the transient performance of tracking errors, even in the presence of the lumped disturbance...
April 15, 2017: ISA Transactions
https://www.readbyqxmd.com/read/28420214/multi-mode-estimation-for-small-fixed-wing-unmanned-aerial-vehicle-localization-based-on-a-linear-matrix-inequality-approach
#9
Mostafa Elzoghby, Fu Li, Ibrahim I Arafa, Usman Arif
Information fusion from multiple sensors ensures the accuracy and robustness of a navigation system, especially in the absence of global positioning system (GPS) data which gets degraded in many cases. A way to deal with multi-mode estimation for a small fixed wing unmanned aerial vehicle (UAV) localization framework is proposed, which depends on utilizing a Luenberger observer-based linear matrix inequality (LMI) approach. The proposed estimation technique relies on the interaction between multiple measurement modes and a continuous observer...
April 18, 2017: Sensors
https://www.readbyqxmd.com/read/28410747/robust-guaranteed-cost-tracking-control-of-quadrotor-uav-with-uncertainties
#10
Zhiwei Xu, Xiaohong Nian, Haibo Wang, Yinsheng Chen
In this paper, a robust guaranteed cost controller (RGCC) is proposed for quadrotor UAV system with uncertainties to address set-point tracking problem. A sufficient condition of the existence for RGCC is derived by Lyapunov stability theorem. The designed RGCC not only guarantees the whole closed-loop system asymptotically stable but also makes the quadratic performance level built for the closed-loop system have an upper bound irrespective to all admissible parameter uncertainties. Then, an optimal robust guaranteed cost controller is developed to minimize the upper bound of performance level...
April 12, 2017: ISA Transactions
https://www.readbyqxmd.com/read/28400784/high-throughput-phenotyping-of-sorghum-plant-height-using-an-unmanned-aerial-vehicle-and-its-application-to-genomic-prediction-modeling
#11
Kakeru Watanabe, Wei Guo, Keigo Arai, Hideki Takanashi, Hiromi Kajiya-Kanegae, Masaaki Kobayashi, Kentaro Yano, Tsuyoshi Tokunaga, Toru Fujiwara, Nobuhiro Tsutsumi, Hiroyoshi Iwata
Genomics-assisted breeding methods have been rapidly developed with novel technologies such as next-generation sequencing, genomic selection and genome-wide association study. However, phenotyping is still time consuming and is a serious bottleneck in genomics-assisted breeding. In this study, we established a high-throughput phenotyping system for sorghum plant height and its response to nitrogen availability; this system relies on the use of unmanned aerial vehicle (UAV) remote sensing with either an RGB or near-infrared, green and blue (NIR-GB) camera...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28397775/coastal-areas-division-and-coverage-with-multiple-uavs-for-remote-sensing
#12
Fotios Balampanis, Iván Maza, Aníbal Ollero
This paper tackles the problems of exact cell decomposition and partitioning of a coastal region for a team of heterogeneous Unmanned Aerial Vehicles (UAVs) with an approach that takes into account the field of view or sensing radius of the sensors on-board. An initial sensor-based exact cell decomposition of the area aids in the partitioning process, which is performed in two steps. In the first step, a growing regions algorithm performs an isotropic partitioning of the area based on the initial locations of the UAVs and their relative capabilities...
April 9, 2017: Sensors
https://www.readbyqxmd.com/read/28273845/a-novel-system-for-correction-of-relative-angular-displacement-between-airborne-platform-and-uav-in-target-localization
#13
Chenglong Liu, Jinghong Liu, Yueming Song, Huaidan Liang
This paper provides a system and method for correction of relative angular displacements between an Unmanned Aerial Vehicle (UAV) and its onboard strap-down photoelectric platform to improve localization accuracy. Because the angular displacements have an influence on the final accuracy, by attaching a measuring system to the platform, the texture image of platform base bulkhead can be collected in a real-time manner. Through the image registration, the displacement vector of the platform relative to its bulkhead can be calculated to further determine angular displacements...
March 4, 2017: Sensors
https://www.readbyqxmd.com/read/28273815/development-of-an-unmanned-aerial-vehicle-borne-crop-growth-monitoring-system
#14
Jun Ni, Lili Yao, Jingchao Zhang, Weixing Cao, Yan Zhu, Xiuxiang Tai
In view of the demand for a low-cost, high-throughput method for the continuous acquisition of crop growth information, this study describes a crop-growth monitoring system which uses an unmanned aerial vehicle (UAV) as an operating platform. The system is capable of real-time online acquisition of various major indexes, e.g., the normalized difference vegetation index (NDVI) of the crop canopy, ratio vegetation index (RVI), leaf nitrogen accumulation (LNA), leaf area index (LAI), and leaf dry weight (LDW)...
March 3, 2017: Sensors
https://www.readbyqxmd.com/read/28264425/coordinated-target-tracking-via-a-hybrid-optimization-approach
#15
Yin Wang, Yan Cao
Recent advances in computer science and electronics have greatly expanded the capabilities of unmanned aerial vehicles (UAV) in both defense and civil applications, such as moving ground object tracking. Due to the uncertainties of the application environments and objects' motion, it is difficult to maintain the tracked object always within the sensor coverage area by using a single UAV. Hence, it is necessary to deploy a group of UAVs to improve the robustness of the tracking. This paper investigates the problem of tracking ground moving objects with a group of UAVs using gimbaled sensors under flight dynamic and collision-free constraints...
February 27, 2017: Sensors
https://www.readbyqxmd.com/read/28245587/unmanned-aerial-vehicle-based-wireless-sensor-network-for-marine-coastal-environment-monitoring
#16
Carlos A Trasviña-Moreno, Rubén Blasco, Álvaro Marco, Roberto Casas, Armando Trasviña-Castro
Marine environments are delicate ecosystems which directly influence local climates, flora, fauna, and human activities. Their monitorization plays a key role in their preservation, which is most commonly done through the use of environmental sensing buoy networks. These devices transmit data by means of satellite communications or close-range base stations, which present several limitations and elevated infrastructure costs. Unmanned Aerial Vehicles (UAV) are another alternative for remote environmental monitoring which provide new types of data and ease of use...
February 24, 2017: Sensors
https://www.readbyqxmd.com/read/28241479/unmanned-aerial-vehicle-systems-for-remote-estimation-of-flooded-areas-based-on-complex-image-processing
#17
Dan Popescu, Loretta Ichim, Florin Stoican
Floods are natural disasters which cause the most economic damage at the global level. Therefore, flood monitoring and damage estimation are very important for the population, authorities and insurance companies. The paper proposes an original solution, based on a hybrid network and complex image processing, to this problem. As first novelty, a multilevel system, with two components, terrestrial and aerial, was proposed and designed by the authors as support for image acquisition from a delimited region. The terrestrial component contains a Ground Control Station, as a coordinator at distance, which communicates via the internet with more Ground Data Terminals, as a fixed nodes network for data acquisition and communication...
February 23, 2017: Sensors
https://www.readbyqxmd.com/read/28230727/analyzing-the-effects-of-uav-mobility-patterns-on-data-collection-in-wireless-sensor-networks
#18
Sarmad Rashed, Mujdat Soyturk
Sensor nodes in a Wireless Sensor Network (WSN) can be dispersed over a remote sensing area (e.g., the regions that are hardly accessed by human beings). In such kinds of networks, datacollectionbecomesoneofthemajorissues. Getting connected to each sensor node and retrieving the information in time introduces new challenges. Mobile sink usage-especially Unmanned Aerial Vehicles (UAVs)-is the most convenient approach to covering the area and accessing each sensor node in such a large-scale WSN. However, the operation of the UAV depends on some parameters, such as endurance time, altitude, speed, radio type in use, and the path...
February 20, 2017: Sensors
https://www.readbyqxmd.com/read/28218699/gimbal-influence-on-the-stability-of-exterior-orientation-parameters-of-uav-acquired-images
#19
Mateo Gašparović, Luka Jurjević
In this paper, results from the analysis of the gimbal impact on the determination of the camera exterior orientation parameters of an Unmanned Aerial Vehicle (UAV) are presented and interpreted. Additionally, a new approach and methodology for testing the influence of gimbals on the exterior orientation parameters of UAV acquired images is presented. The main motive of this study is to examine the possibility of obtaining better geometry and favorable spatial bundles of rays of images in UAV photogrammetric surveying...
February 18, 2017: Sensors
https://www.readbyqxmd.com/read/28216557/a-methodology-to-monitor-airborne-pm10-dust-particles-using-a-small-unmanned-aerial-vehicle
#20
Miguel Alvarado, Felipe Gonzalez, Peter Erskine, David Cliff, Darlene Heuff
Throughout the process of coal extraction from surface mines, gases and particles are emitted in the form of fugitive emissions by activities such as hauling, blasting and transportation. As these emissions are diffuse in nature, estimations based upon emission factors and dispersion/advection equations need to be measured directly from the atmosphere. This paper expands upon previous research undertaken to develop a relative methodology to monitor PM10 dust particles produced by mining activities making use of small unmanned aerial vehicles (UAVs)...
February 14, 2017: Sensors
keyword
keyword
102944
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"