Estimation of Vertical Take-off Unmanned Aircraft Flight Characteristics and Algorithm of Required Roll Angle Calculating for Trajectory Tracking

2021 ◽  
Vol 64 (3) ◽  
pp. 416-423
Author(s):  
T. Yu. Gainutdinova ◽  
A. V. Gainutdinova ◽  
M. V. Trusfus ◽  
V. G. Gainutdinov ◽  
T. A. Zamaleev
Keyword(s):  
Trajectory Tracking ◽  
Unmanned Aircraft ◽  
Roll Angle ◽  
Aircraft Flight

Detection of Conflicts Between ADS-B-Equipped Aircraft and Unmanned Aerial Systems

2020 ◽  
Vol 2674 (1) ◽  
pp. 197-204
Author(s):  
John H. Mott ◽  
Zachary A. Marshall ◽  
Mark A. Vandehey ◽  
Mike May ◽  
Darcy M. Bullock
Keyword(s):  
High Performance ◽  
Low Cost ◽  
Federal Aviation Administration ◽  
Unmanned Aircraft ◽  
Sensor Technology ◽  
Unmanned Aerial Systems ◽  
Aircraft Flight ◽  
Flight Operations ◽  
Aerial Systems ◽  
Operational Simplicity

Versatile unmanned aerial system (UAS) platforms have grown significantly in popularity by virtue of their low cost relative to manned aircraft, high performance, and operational simplicity. While the Federal Aviation Administration (FAA) currently regulates the operating altitudes, speeds, weights, pilot qualifications, and locations of drones, a lack of capacity and technology prohibits sufficient enforcement of these restrictions. To assess the frequency and severity of manned and unmanned aircraft separation incidents, and to examine the emerging sensor technology available to facilitate such assessment, flight operations in controlled airspace around Orlando Melbourne International Airport (KMLB) were monitored. One sensor system deployed at KMLB reported UAS locations, altitudes, and flight durations, while a second system reported manned aircraft positions, altitudes, and timestamps using ADS-B signals. Evaluation of flight operations data in the vicinity of KMLB revealed eight potential drone incursions over a 2-week period. Aircraft flight paths were retroactively tracked to map these unmanned and manned aerial conflicts; aircraft identification information was also researched to contextualize the incidents. The frequency and magnitude of identified events suggest the need for additional research to further explore the problem scope and potential solutions.

Simplex Methods for Optimal Control of Unmanned Aircraft Flight Trajectories

2017 ◽  
Author(s):  
Michael D. Zollars ◽  
Richard G. Cobb
Keyword(s):  
Delaunay Triangulation ◽  
Unmanned Aircraft ◽  
Collocation Methods ◽  
Barycentric Coordinates ◽  
Flight Trajectory ◽  
Orthogonal Collocation ◽  
Aircraft Flight ◽  
Constrained Delaunay Triangulation ◽  
Flight Trajectories ◽  
Aircraft System

The feasibility of using a constrained Delaunay triangulation method for determining optimal flight trajectories of unmanned air vehicles in a constrained environment is explored. Current methods for developing optimal flight trajectories have yet to achieve computational times that allow for real-time implementation. The proposed method alleviates the dependency of problem specific parameters while eliminating constraints on the Non-Linear Program. Given an input of obstacles with n vertices, a constrained Delaunay triangulation is performed on the space. Converting the vertices of the triangulation to barycentric coordinates on a phased approach defines the state bounds and max time for each phase. With two-dimensional aircraft dynamics, direct orthogonal collocation methods are performed to compute the optimal flight trajectory. Results illustrate computational times and feasibility of Small Unmanned Aircraft System flight trajectories through polygon constraints.

Unmanned aircraft automatic flight control algorithm in a spin maneuver

2020 ◽  
Vol 92 (8) ◽  
pp. 1215-1224
Author(s):  
Tomasz Rogalski ◽  
Paweł Rzucidło ◽  
Jacek Prusik
Keyword(s):  
Automatic Control ◽  
Flight Control ◽  
Unmanned Aircraft ◽  
Control Algorithms ◽  
Content Type ◽  
Aircraft Flight ◽  
Control Precision ◽  
In Series ◽  
Flight Parameters ◽  
High Control

Purpose The paper aims to present an idea of automatic control algorithms dedicated to both small manned and unmanned aircraft, capable to perform spin maneuver automatically. This is a case of maneuver far away from so-called standard flight. The character of this maneuver and the range of aircraft flight parameters changes restrict application of standard control algorithms. Possibility of acquisition full information about aircraft flight parameters is limited as well in such cases. This paper analyses an alternative solution that can be applied in some specific cases. Design/methodology/approach The paper uses theoretical discussion and breakdowns to create basics for development of structures of control algorithms. Simplified analytical approach was applied to tune regulators. Results of research were verified in series of software-in-the loop, computer simulations. Findings The structure of the control system enabling aerobatic flight (spin flight as example selected) was found and the method how to tune regulators was presented as well. Practical implications It could be a fundament for autopilots working in non-conventional flight states and aircraft automatic recovery systems. Originality/value The paper presents author’s original approach to aircraft automatic control when high control precision is not the priority, and not all flight parameters can be precisely measured.

Robust Trajectory Tracking for Unmanned Aircraft Systems using a Nonsingular Terminal Modified Super-Twisting Sliding Mode Controller

2018 ◽  
Vol 93 (1-2) ◽  
pp. 55-72 ◽  
Author(s):  
Filiberto Muñoz ◽  
Eduardo S. Espinoza ◽  
Iván González-Hernández ◽  
Sergio Salazar ◽  
Rogelio Lozano
Keyword(s):  
Trajectory Tracking ◽  
Sliding Mode ◽  
Unmanned Aircraft ◽  
Unmanned Aircraft Systems ◽  
Sliding Mode Controller ◽  
Aircraft Systems

scholarly journals Design and Implementation of Integral Backstepping Sliding Mode Control for Quadrotor Trajectory Tracking

Processes ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 1951
Author(s):  
Shun-Hung Tsai ◽  
Yi-Ping Chang ◽  
Hung-Yi Lin ◽  
Luh-Maan Chang
Keyword(s):  
Trajectory Tracking ◽  
Sliding Mode ◽  
Unmanned Aircraft ◽  
Trajectory Tracking Control ◽  
Attitude Tracking ◽  
Control Scheme ◽  
Tracking Controller ◽  
Backstepping Sliding Mode Control ◽  
Trajectory Tracking Controller ◽  
The Stability

A robust trajectory tracking control scheme for quadrotor unmanned aircraft vehicles under uncertainties is proposed herein. A tracking controller combined with the sliding mode and integral backstepping is performed for position and attitude tracking. The stability of the trajectory tracking controller of the quadrotor is investigated via Lyapunov stability analysis. By incorporating force and torque disturbances into numerical simulations, the results demonstrate the effectiveness of the proposed quadrotor trajectory controller. Finally, the experiments validate the feasibility of the proposed controller.

scholarly journals EVALUATION OF SMALL UNMANNED AIRCRAFT FLIGHT TRAJECTORY ACCURACY / IŠORINIŲ FAKTORIŲ ĮTAKOS NEDIDELIO AUTONOMINIO ORLAIVIO SKRYDŽIO TRAJEKTORIJOS TIKSLUMUI VERTINIMAS

2014 ◽  
Vol 6 (5) ◽  
pp. 577-582
Author(s):  
Ramūnas Kikutis ◽  
Jonas Stankūnas
Keyword(s):  
Theoretical Calculations ◽  
High Reliability ◽  
Unmanned Aircraft ◽  
Flight Path ◽  
Flight Trajectory ◽  
Circular Trajectory ◽  
Aircraft Flight ◽  
Air Space ◽  
Wind Influence ◽  
Main Factors

Today small unmanned aircraft are being more widely adapted for practical tasks. These tasks require high reliability and flight path accuracy. For such aircraft we have to deal with the chalenge how to compensate external factors and how to ensure the accuracy of the flight trajectory according to new regulations and standards. In this paper, new regulations for the flights of small unmanned aircraft in Lithuanian air space are discussed. Main factors, which affect errors of the autonomous flight path tracking, are discussed too. The emphasis is on the wind factor and the flight path of Dubbin’s trajectories. Research was performed with mathematical-dynamic model of UAV and it was compared with theoretical calculations. All calculations and experiments were accomplished for the circular part of Dubbin’s paths when the airplane was trimmed for circular trajectory flight in calm conditions. Further, for such flight the wind influence was analysed. Nedideli autonominiai orlaiviai yra vis plačiau pritaikomi praktinėms užduotims, kurioms reikalingas aukštas skrydžio patikimumas bei trajektorijos tikslumas, vykdyti. Kuriant bei naudojant tokius orlaivius, reikia vertinti egzistuojančių standartų bei taisyklių reikalavimus ir išorinių faktorių įtaką skrydžių trajektorijos tikslumui. Darbe aptariamos naujausios skrydžių autonominiais orlaiviais Lietuvoje taisyklės bei pagrindiniai faktoriai, darantys įtaką skrydžio trajektorijos paklaidoms. Darbe didžiausias dėmesys skirtas vėjo faktoriaus įtakos skrydžio trajektorijai vertinti, kai automatinio valdymo sistema nesiima koreguojamųjų veiksmų. Tyrimas atliktas remiantis teoriniais skaičiavimais bei traktuojant, kad orlaivis – taškinis kūnas. Šie rezultatai palyginti su gautaisiais panaudojus orlaivio dinaminį modelį.

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