scholarly journals Indicators for the Quality of Funds for Radioelectronic Countermeasure of Unmanned Aerial Vehicles

2019 ◽  
Vol LVI (1) ◽  
Author(s):  
Nikolay Gueorguiev ◽  
Aleksandar Kolarov ◽  
Vencislav Pehlivanski ◽  
Ognian Todorov
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Aerial Vehicles

scholarly journals Active stabilization of unmanned aerial vehicle imaging platform

2020 ◽  
Vol 26 (19-20) ◽  
pp. 1791-1803 ◽  
Author(s):  
Mohit Verma ◽  
Vicente Lafarga ◽  
Mael Baron ◽  
Christophe Collette
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Unmanned Aerial Vehicle ◽  
Vibration Isolation ◽  
Isolation System ◽  
Aerial Vehicles ◽  
Active Stabilization ◽  
Aerial Vehicle ◽  
Active Vibration ◽  
Improved Performance

The advancement in technology has seen a rapid increase in the use of unmanned aerial vehicles for various applications. These unmanned aerial vehicles are often equipped with the imaging platform like a camera. During the unmanned aerial vehicle flight, the camera is subjected to vibrations which hamper the quality of the captured images/videos. The high-frequency vibrations from the unmanned aerial vehicle are transmitted to the camera. Conventionally, passive rubber mounts are used to isolate the camera from the drone vibrations. The passive mounts are able to provide reduction in response near the resonance. However, this comes at the cost of amplification of response at the higher frequency. This article proposes an active vibration isolation system which exhibits improved performance at the higher frequencies than the conventional system. The active isolation system consists of a contact-less voice coil actuator supported by four springs. Experiments are carried out to study the effect of vibrations on the quality of images captured. The characterization of drone vibrations is also carried out by recording the acceleration during different flight modes. The performance of the proposed isolation system is experimentally validated on a real drone camera subjected to the recorded drone acceleration spectrum. The isolation system is found to perform better than the conventional rubber mounts and is able to reduce the vibrations to a factor of one-fourth. It can be effectively used to improve the image acquisition quality of the unmanned aerial vehicles.

scholarly journals Internet of Unmanned Aerial Vehicles: QoS Provisioning in Aerial Ad-Hoc Networks

Sensors ◽  
2020 ◽  
Vol 20 (11) ◽  
pp. 3160 ◽  
Author(s):  
Kirshna Kumar ◽  
Sushil Kumar ◽  
Omprakash Kaiwartya ◽  
Ajay Sikandar ◽  
Rupak Kharel ◽  
...  
Keyword(s):  
Ad Hoc Networks ◽  
Unmanned Aerial Vehicles ◽  
Ad Hoc Network ◽  
Ad Hoc ◽  
Qos Provisioning ◽  
Smart Services ◽  
Aerial Vehicles ◽  
Service Oriented ◽  
Hoc Networks

Aerial ad-hoc networks have the potential to enable smart services while maintaining communication between the ground system and unmanned aerial vehicles (UAV). Previous research has focused on enabling aerial data-centric smart services while integrating the benefits of aerial objects such as UAVs in hostile and non-hostile environments. Quality of service (QoS) provisioning in UAV-assisted communication is a challenging research theme in aerial ad-hoc networks environments. Literature on aerial ad hoc networks lacks cooperative service-oriented modeling for distributed network environments, relying on costly static base station-oriented centralized network environments. Towards this end, this paper proposes a quality of service provisioning framework for a UAV-assisted aerial ad hoc network environment (QSPU) focusing on reliable aerial communication. The UAV’s aerial mobility and service parameters are modelled considering highly dynamic aerial ad-hoc environments. UAV-centric mobility models are utilized to develop a complete aerial routing framework. A comparative performance evaluation demonstrates the benefits of the proposed aerial communication framework. It is evident that QSPU outperforms the state-of-the-art techniques in terms of a number of service-oriented performance metrics in a UAV-assisted aerial ad-hoc network environment.

scholarly journals FUZZY C-MEANS ALGORITHM FOR SEGMENTATION OF AERIAL PHOTOGRAPHY DATA OBTAINED USING UNMANNED AERIAL VEHICLE

2015 ◽  
Vol XL-5/W6 ◽  
pp. 113-115 ◽  
Author(s):  
M. V. Akinin ◽  
N. V. Akinina ◽  
A. Y. Klochkov ◽  
M. B. Nikiforov ◽  
A. V. Sokolova
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Aerial Photography ◽  
Experimental Studies ◽  
Two Dimensional ◽  
Fuzzy C Means ◽  
Aerial Vehicles ◽  
Short Period ◽  
Aerial Vehicle ◽  
Fuzzy C Means Algorithm

The report reviewed the algorithm fuzzy c-means, performs image segmentation, give an estimate of the quality of his work on the criterion of Xie-Beni, contain the results of experimental studies of the algorithm in the context of solving the problem of drawing up detailed two-dimensional maps with the use of unmanned aerial vehicles. According to the results of the experiment concluded that the possibility of applying the algorithm in problems of decoding images obtained as a result of aerial photography. The considered algorithm can significantly break the original image into a plurality of segments (clusters) in a relatively short period of time, which is achieved by modification of the original k-means algorithm to work in a fuzzy task.

scholarly journals DEVELOPMENT OF BASIC STRUCTURE FOR QUALITY MANAGEMENT SYSTEM OF TREND POTENTIAL OF COMPLEX TECHNICAL SYSTEM OF UNMANNED AERIAL VEHICLES

2019 ◽  
Vol 1 (7) ◽  
pp. 46-52 ◽  
Author(s):  
V. M. Balashov ◽  
S. A. Nazarevich ◽  
A. V. Urentsev
Keyword(s):  
Life Cycle ◽  
Unmanned Aerial Vehicles ◽  
Quality Management System ◽  
Planning Horizon ◽  
Basic Structure ◽  
Aerial Vehicles ◽  
Complex Technical System ◽  
Complex Technical Systems ◽  
Technical Systems

In conditions when the volume of government orders for defense products may significantly decline, enterprises of the radioelectronic industry are faced with the need to move to civilian product markets, which will stabilize the order portfolio and reduce macroeconomic and technological risks. The article presents the main approaches to the analysis of the trend potential of complex technical systems on the example of unmanned aerial vehicles. Methods for assessing the quality of complex technical systems at different stages of the development of the potential of complex technical systems in the structure of the life cycle are proposed. A hypothetical fragment of a chronological analysis of the potential state of complex technical systems with a planning horizon of five to ten years is presented. The proposed approaches and mathematical models make it possible to predict the potential and to optimize the consumer characteristics of complex technical systems, based on the requirements of customers, the development of their needs, as well as on the implementation of advanced standardization.

scholarly journals Resource allocation and service management in next generation 5G wireless networks

2019 ◽  
Author(s):  
Παναγιώτης Βαμβακάς
Keyword(s):  
Machine Learning ◽  
Resource Allocation ◽  
Unmanned Aerial Vehicles ◽  
Utility Theory ◽  
Service Management ◽  
Learning Automata ◽  
Expected Utility Theory ◽  
Visible Light Communications ◽  
Aerial Vehicles

Η παρούσα διδακτορική διατριβή πραγματεύτεται το πρόβλημα της βέλτιστης κατανομής πόρων και την πολύπλευρη διαχείριση υπηρεσιών σε ασύρματα δίκτυα 5ης γενιάς (5G). Βασικό αντικείμενο της εργασίας αποτελεί η βελτιστοποίηση της ποιότητας υπηρεσίας (Quality of Service) εντός του δικτύου τόσο στα πλαίσια της αύξησης της ενεργειακής αποδοτικότητας του δικτύου συνολικά, αλλά και λαμβάνοντας υπόψη την ετερογένεια μεταξύ των χρηστών ως προς τις απαιτήσεις της εκπομπής τους. Ειδικά σχεδιασμένες συναρτήσεις χρησιμότητας (utility functions) επιτρέπουν στους χρήστες να ποσοτικοποιούν διάφορες παραμέτρους της επικοινωνίας ζεύξης ανόδου (uplink communication) αντικατοπτρίζοντας την ικανοποίηση τους από την κατανομή των εκάστοτε πόρων (π.χ. ισχύς εκπομπής, ρυθμός μετάδοσης, κοστολόγηση κλπ.). Συγκεκριμένα, τα προβλήματα κατανομής πόρων μελετώνται υπό διαφορετικές τεχνολογίες αιχμής, τεχνικές πρόσβασης, αρχιτεκτονικές δικτύου και διακριτά είδη υπηρεσιών, υπό συνθήκες ανταγωνισμού των χρηστών ή σε αντίξοα περιβάλλοντα επικοινωνίας. Τα εκάστοτε προβλήματα μοντελοποιούνται ως μη συνεργατικά παίγνια τα οποία επιλύθηκαν με βάση τις αρχές της Θεωρίας Παιγνίων και Βελτιστοποίησης, παρέχοντας στους χρήστες τον βασικό έλεγχο της λήψης των αποφάσεων κατά την διάρκεια της εκπομπής τους. Με αυτόν τον τρόπο, επιτυγχάνεται η αποκέντρωση του συστήματος και η ισχυροποίηση του ρόλου των χρηστών στην διαδικασία της κατανομής πόρων και της βελτιστοποίηση της λειτουργίας του ασύρματου δικτύου. Σε κάθε περίπτωση, επιβεβαιώνεται η ύπαρξη του σημείου ισορροπίας κατά Nash (Nash Equilibrium) το οποίο αντιπροσωπεύει μια σταθερή έκβαση της κατανομής από την οποία κανένας χρήστης δεν επιθυμεί να παρεκλίνει. Παράλληλα, κατανεμημένοι αλγόριθμοι χαμηλής πολυπλοκότητας αναλαμβάνουν την σύγκλιση των παιγνίων στα ανωτέρω σημεία ισορροπίας. Πιο αναλυτικά, αρχικά ερευνήθηκε η κατανομή πόρων σε πολυεπίπεδα δίκτυα με χρήση μάκρο και φεμτοκυψελών (macro and femtocells) με τα προβλήματα να επεκτείνονται σε πιο ευρείες και σύνθετες κατανομές της ισχύος εκπομπής και του ρυθμού μετάδοσης για διαφορετικά είδη υπηρεσιών. Επίσης μελετήθηκε το πρόβλημα της κατανομής ισχύος και οπτικών σημείων πρόσβασης για επικοινωνίες ορατού φωτός (Visible Light Communications) για διαφορετικές τεχνικές πρόσβασης. Εν συνεχεία, αναλύθηκε το πρόβλημα της εξατομικευμένης κοστολόγησης της εκπομπής των χρηστών. Βασική καινοτομία της εν λόγω προσέγγισης, αποτελεί η παραδοχή ότι η εκάστοτε τιμή συνιστά έναν ακόμη πεπερασμένο πόρο προς κατανομή, σε αντίθεση με την βιβλιογραφία στην οποία αντιμετωπίζεται ως μια εξωτερική ποινή που επιβάλλεται από τον διαχειριστή ώστε να μειωθούν οι παρεμβολές εντός του δικτύου. Το πρόβλημα μελετάται για διαφορετικούς συνδυασμούς πόρων (ισχύος εκπομπής ή / και ρυθμού μετάδοσης) για ποικίλα σενάρια κοστολόγησης. Συνακόλουθα, το πρόβλημα εξετάστηκε υπό συνθήκες ανταγωνισμού των παρόχων υπηρεσίας, οι οποίοι προσαρμόζοντας τις πολιτικές και τα επίπεδα των τιμών, επιδιώκουν την απόκτηση μεγαλύτερων μεριδίων αγοράς. Οι χρήστες μοντελοποιούνται και λαμβάνουν αποφάσεις ως μανθάνοντα αυτόματα (learning automata) υπό τις αρχές της Νοημοσύνης των Μηχανών (Machine Learning), αυτοματοποιώντας έτσι την βέλτιστη επιλογή του παρόχου. Η παρούσα διατριβή επίσης διερευνά τα προβλήματα της δυναμικής σύνθεσης υπηρεσιών (service bundling) και κατανομής πόρων μέσω του σχεδιασμού συνεργατικών τηλεπικοινωνιακών προϊόντων, τα οποία καθορίζονται αυτόνομα από τους χρήστες. Παράλληλα, μελετήθηκε η βέλτιστη ασύρματη φόρτιση της μπαταρίας των χρηστών με κριτήριο τις ενεργειακές ανάγκες των χρηστών από την επικείμενη εκπομπή τους. Ολοκληρώνοντας, στην διδακτορική αυτή διατριβή, το πρόβλημα της κατανομής πόρων αντιμετωπίζεται συνολικά μέσω μίας καινοτόμου και ρεαλιστικής προσέγγισης υιοθετώντας την χρήση της Θεωρίας Προοπτικής (Prospect Theory), η οποία ανατρέπει την έως τώρα επιλογή της Θεωρίας Αναμενόμενης Χρησιμότητας (Expected Utility Theory) σε θέματα κατανομής πόρων. Για πρώτη φορά στην σχετική βιβλιογραφία, τα προβλήματα διατυπώνονται ενσωματώνοντας την υποκειμενικότητα των χρηστών στην λήψη αποφάσεων όταν επικρατούν συνθήκες αβεβαιότητας, ενώ ταυτόχρονα για πρώτη φορά εισάγεται η συνθήκη της πιθανής κατάρρευσης του εύρους ζώνης λόγω της υπέρμετρης χρήσης του εντός του δικτύου. Το ανωτέρω πλαίσιο υλοποιείται για διαφορετικά σενάρια (συνδυασμός αδειοδοτημένου και μη εύρους ζώνης, ταυτόχρονη εκπομπή μέσω πολλαπλών τεχνικών πρόσβασης), ενώ επιπλέον αναλύεται η κατανομή πόρων και η ασφάλεια (network security) σε δίκτυα δημόσιας ασφάλειας (Public Safety Networks) με αξιοποίηση μη επανδρωμένων αεροσκαφών (Unmanned Aerial Vehicles).

scholarly journals Influence of the Sun Position and Platform Orientation on the Quality of Imagery Obtained from Unmanned Aerial Vehicles

2020 ◽  
Vol 12 (6) ◽  
pp. 1040 ◽  
Author(s):  
Aleksandra Sekrecka ◽  
Damian Wierzbicki ◽  
Michal Kedzierski
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Correction Method ◽  
Accurate Information ◽  
The Sun ◽  
Aerial Vehicles ◽  
The Difference ◽  
Third Dimension

Images acquired at a low altitude can be the source of accurate information about various environmental phenomena. Often, however, this information is distorted by various factors, so a correction of the images needs to be performed to recreate the actual reflective properties of the imaged area. Due to the low flight altitude, the correction of images from UAVs (unmanned aerial vehicles) is usually limited to noise reduction and detector errors. The article shows the influence of the Sun position and platform deviation angles on the quality of images obtained by UAVs. Tilting the camera placed on an unmanned platform leads to incorrect exposures of imagery, and the order of this distortion depends on the position of the Sun during imaging. An image can be considered in three-dimensional space, where the x and y coordinates determine the position of the pixel and the third dimension determines its exposure. This assumption is the basis for the proposed method of image exposure compensation. A three-dimensional transformation by rotation is used to determine the adjustment matrix to correct the image quality. The adjustments depend on the angles of the platform and the difference between the direction of flight and the position of the Sun. An additional factor regulates the value of the adjustment depending on the ratio of the pitch and roll angles. The experiments were carried out for two sets of data obtained with different unmanned systems. The correction method used can improve the block exposure by up to 60%. The method gives the best results for simple systems, not equipped with lighting compensation systems.

The Use of Unmanned Aerial Vehicles (UAVs) in Slope Stability Assessment

2018 ◽  
Author(s):  
Connor Meeks
Keyword(s):  
Unmanned Aerial Vehicles ◽  
3D Model ◽  
Complex Geometry ◽  
Data Sets ◽  
Current Standard ◽  
Surface Areas ◽  
Helicopter Flight ◽  
Aerial Vehicles ◽  
Detailed Application

The use and applications of unmanned aerial vehicles (UAVs) in geotechnical engineering is rapidly growing, leading to changes in the way that data is acquired, analyzed and processed. UAVs can reach areas previously inaccessible via ground or helicopter, while also being quickly deployed. Cameras are the current standard for data collection and 3D model creation. There are multiple types of UAV’s currently available. Quadcopters can take off and land in spatially constrained areas, but carry a small stabilized camera producing low quality models. Octocopters permit an increased payload, so a higher quality camera can be attached, allowing for increased model accuracy. Flight time is reduced by the additional weight. Fixed wing UAVs create higher quality photogrammetry models, and are commonly deployed over large surface areas. Transport Canada certification must be approved prior to any flights occurring for research or work. A detailed application must be created, including a flight plan and demonstration of prior flight experience. At the White Canyon site in B.C., a Phantom 4 Quadcopter was flown for geotechnical analysis of a complex geometry slope, which has previously been studied for several years. The terrain has occluded the data available from the ground or from permissible helicopter flight paths. Therefore, detailed information from the slope has not been previously available. The process of using a UAV to obtain these data sets, to develop a full 3D model of these areas of the slope is discussed, considering the accuracy and quality of the data available.

scholarly journals COMPARING MULTI-SOURCE PHOTOGRAMMETRIC DATA DURING THE EXAMINATION OF VERTICALITY IN A MONUMENTAL TOWER

2017 ◽  
Vol XLII-2/W3 ◽  
pp. 475-480
Author(s):  
J. Markiewicz ◽  
D. Zawieska ◽  
P. Podlasiak
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Point Cloud ◽  
Laser Scanning ◽  
Terrestrial Laser Scanning ◽  
Point Clouds ◽  
Cloud Processing ◽  
Point Cloud Processing ◽  
Aerial Vehicles ◽  
Geometric Quality

This paper presents an analysis of source photogrammetric data in relation to the examination of verticality in a monumental tower. In the proposed data processing methodology, the geometric quality of the point clouds relating to the monumental tower of the castle in Iłżawas established by using terrestrial laser scanning (Z+F 5006h, Leica C10), terrestrial photographs and digital images sourced via unmanned aerial vehicles (UAV) (Leica Aibot X6 Hexacopter). Tests were performed using the original software, developed by the authors, which allows for the automation of 3D point cloud processing. The software also facilitates the verification of the verticality of the tower and the assessment of the quality of utilized data.

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