{"title":"Visual odometry for autonomous outdoor flight of a quadrotor UAV","authors":"H. Romero, S. Salazar, O. Santos, R. Lozano","doi":"10.1109/ICUAS.2013.6564748","DOIUrl":"https://doi.org/10.1109/ICUAS.2013.6564748","url":null,"abstract":"In this paper we propose an alternative approach to estimate the UAV translational velocity and position applying an onboard optical flow sensor. This, is a appropriated sensor to be used in a mini UAV due to its lightness and smallness. With this approach we are able to perform real-time autonomous outdoor and indoor flight without using the GPS information, which in some case is blocked, denied or jammed. Additionally, a PD controller is robustly tuned in order to compensate the uncertain velocity measurements provided by the optical flow sensor. The experimental results obtained by using this approach shown the feasibility of the proposed sensor-controller scheme.","PeriodicalId":322089,"journal":{"name":"2013 International Conference on Unmanned Aircraft Systems (ICUAS)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126398158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Garcia, T. Muskardin, A. Viguria, M. Laiacker, A. Ollero, K. Kondak
{"title":"Analysis and development of a reliable fixed wing UAV control system for mission profiles with restricted GPS availability","authors":"M. Garcia, T. Muskardin, A. Viguria, M. Laiacker, A. Ollero, K. Kondak","doi":"10.1109/ICUAS.2013.6564738","DOIUrl":"https://doi.org/10.1109/ICUAS.2013.6564738","url":null,"abstract":"This paper is motivated by the actual need for safer and more reliable flight control systems for fixed wing UAVs. In certain mission scenarios, it is necessary to fly close to big structures at low altitudes where the availability of GPS sensor data cannot be guaranteed. Two different control strategies have been analyzed, with the main difference consisting in the utilization of GPS data for flight control. An extended system allowing those two control strategies to complement one to another has been developed. Its performance has been analyzed through simulation and in flight experiments. The result is a more reliable flight control system for flying in areas with restricted GPS signal.","PeriodicalId":322089,"journal":{"name":"2013 International Conference on Unmanned Aircraft Systems (ICUAS)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115880859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Changhong Fu, M. Olivares-Méndez, P. Campoy, Ramon Suarez-Fernandez
{"title":"UAS see-and-avoid strategy using a fuzzy logic controller optimized by Cross-Entropy in Scaling Factors and Membership Functions","authors":"Changhong Fu, M. Olivares-Méndez, P. Campoy, Ramon Suarez-Fernandez","doi":"10.1109/ICUAS.2013.6564730","DOIUrl":"https://doi.org/10.1109/ICUAS.2013.6564730","url":null,"abstract":"This work aims to develop a novel Cross-Entropy (CE) optimization-based fuzzy controller for Unmanned Aerial Monocular Vision-IMU System (UAMVIS) to solve the seeand-avoid problem using its accurate autonomous localization information. The function of this fuzzy controller is regulating the heading of this system to avoid the obstacle, e.g. wall. In the Matlab Simulink-based training stages, the Scaling Factor (SF) is adjusted according to the specified task firstly, and then the Membership Function (MF) is tuned based on the optimized Scaling Factor to further improve the collison avoidance performance. After obtained the optimal SF and MF, 64% of rules has been reduced (from 125 rules to 45 rules), and a large number of real flight tests with a quadcopter have been done. The experimental results show that this approach precisely navigates the system to avoid the obstacle. To our best knowledge, this is the first work to present the optimized fuzzy controller for UAMVIS using Cross-Entropy method in Scaling Factors and Membership Functions optimization.","PeriodicalId":322089,"journal":{"name":"2013 International Conference on Unmanned Aircraft Systems (ICUAS)","volume":"252 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133964826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Cooperative and Geometric Learning for path planning of UAVs","authors":"Baochang Zhang, Zhili Mao, Wanquan Liu, Jianzhuang Liu, Zheng Zheng","doi":"10.1109/ICUAS.2013.6564675","DOIUrl":"https://doi.org/10.1109/ICUAS.2013.6564675","url":null,"abstract":"We propose a new learning algorithm, named Cooperative and Geometric Learning (CGL), to solve maneuverability, collision avoidance and information sharing problems in path planning for Unmanned Aerial Vehicles (UAVs). The contributions of CGL are threefold: 1) CGL exploits a specific reward matrix G, which leads to a simple and efficient algorithm for the path planning of multiple UAVs. 2) The optimal path in terms of path length and risk measure from a given point to the target point can be calculated. 3) In CGL, the reward matrix G is calculated in real-time and adaptively updated based on the geometric distance and risk information shared by other UAVs. Extensive experimental results validate the effectiveness and feasibility of CGL on the navigation of UAVs.","PeriodicalId":322089,"journal":{"name":"2013 International Conference on Unmanned Aircraft Systems (ICUAS)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132687980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Constrained formation protocols for networked multiagent systems","authors":"Gerardo De La Torre, T. Yucelen, Eric N. Johnson","doi":"10.1109/ICUAS.2013.6564766","DOIUrl":"https://doi.org/10.1109/ICUAS.2013.6564766","url":null,"abstract":"This paper introduces a new formation framework for networked multiagent systems that can be used for obstacle avoidance. It is shown that the proposed framework minimizes a cost function while satisfying state and control constraints. Furthermore, agents converge to a formation such that the difference in the Laplacian potential of the constrained and desired formation is locally minimized. The proposed framework relies on an easily implementable local optimization process, whose computation load is independent on the network size. Therefore, the framework is scalable and decentralized. The proposed framework can be easily integrated into existing multiagent system guidance protocols in order to avoid obstacles. Several numerical examples are provided to demonstrate the efficacy of the proposed method.","PeriodicalId":322089,"journal":{"name":"2013 International Conference on Unmanned Aircraft Systems (ICUAS)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133144427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
H. Castañeda, Oscar S. Salas-Peña, Jesas de Leon Morales
{"title":"Adaptive super twisting flight control-observer for a fixed wing UAV","authors":"H. Castañeda, Oscar S. Salas-Peña, Jesas de Leon Morales","doi":"10.1109/ICUAS.2013.6564788","DOIUrl":"https://doi.org/10.1109/ICUAS.2013.6564788","url":null,"abstract":"A flight robust control for a fixed wing Unmanned Aerial Vehicle (UAV) is addressed in this paper. Attitude and airspeed controllers are designed using an Adaptive super twisting control algorithm (ASTA). In order to implement such controller an observer based on super-twisting control algorithm (STO) provide estimation of inertial state vector despite of noisy. Furthermore, this control scheme increase robustness since it is not necessary to know the bound of perturbation. Taking into account modeling uncertainties and external disturbances, simulation tests have been done in order to illustrate performance of proposed control scheme.","PeriodicalId":322089,"journal":{"name":"2013 International Conference on Unmanned Aircraft Systems (ICUAS)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115780203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
H. Ramirez-Rodriguez, Vicente Parra‐Vega, A. Sanchez, O. García
{"title":"Integral sliding mode backstepping control of quadrotors for robust position tracking","authors":"H. Ramirez-Rodriguez, Vicente Parra‐Vega, A. Sanchez, O. García","doi":"10.1109/ICUAS.2013.6564717","DOIUrl":"https://doi.org/10.1109/ICUAS.2013.6564717","url":null,"abstract":"A backstepping-based controller that induces integral sliding modes for underactuated lightweight quadrotors is presented for the Newton-Euler dynamic model subject to smooth bounded disturbances, including wind gust and sideslip aerodynamics, as well as dissipative drag in position and orientation dynamics. The chattering-free sliding mode compensates for persistent or intermittent, and possible time-varying, state dependant disturbances. The closed-loop dynamics rejects such disturbances with a chattering-free control effort showing a robust position tracking, possibly with reduced information of the dynamic model. Representative simulations are presented and discussed.","PeriodicalId":322089,"journal":{"name":"2013 International Conference on Unmanned Aircraft Systems (ICUAS)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114407370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Experimental validation of a quaternion-based attitude estimation with direct input to a quadcopter control system","authors":"Oyvind Magnussen, M. Ottestad, G. Hovland","doi":"10.1109/ICUAS.2013.6564723","DOIUrl":"https://doi.org/10.1109/ICUAS.2013.6564723","url":null,"abstract":"This paper presents a method to calculate the attitude quaternion of a quadcopter with few calculations. The quaternion calculation is based on accelerometers and gyroscopes from an Inertial Measurement Unit (IMU). The quaternion from the accelerometer is calculated as the shortest rotation arc from the gravity vector in the navigation frame. The quaternion from the gyroscope is calculated based on equations of the quaternion derivative. A complementary filter is combining the two quaternions with a componentwise comparison. The attitude estimation is calculated without any trigonometric functions. The quaternion is directly used as an input to the attitude controller. The attitude controller is a PD controller running at 400Hz. A model of the quadcopter in Matlab verified that the control system worked as intended. The estimator was verified with a Stewart platform, by mounting the quadcopter on top of it and comparing the angles from the Stewart platform with the angles from the filter. Finally the algorithms were implemented on a quadcopter controller board, and the attitude estimator were compared with the attitude estimation from a high-end IMU from MicroStrain. The complete control system was also tested on a 8-bit microcontroller running at 16 MHz. The relatively slow processor on the microcontroller was also able to do every calculations within 2.5ms.","PeriodicalId":322089,"journal":{"name":"2013 International Conference on Unmanned Aircraft Systems (ICUAS)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124524970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Adaptive neural control design for hypersonic aircraft using time scale separation","authors":"Daoxiang Gao, Shixing Wang, Dunmin Lu","doi":"10.1109/ICUAS.2013.6564792","DOIUrl":"https://doi.org/10.1109/ICUAS.2013.6564792","url":null,"abstract":"This paper presents the design of a neural adaptive flight control systems for the longitudinal dynamics of hypersonic vehicle. By considering the coupling between thrust and pitch moment, the proposed control strategy is derived from the solutions of a series of fast dynamical equations, which are designed by the combination of back-stepping control and time scale separation. The RBF neural networks are employed to approximate the unknown dynamics. Simulation results are included to show the effectiveness of the neural adaptive control method.","PeriodicalId":322089,"journal":{"name":"2013 International Conference on Unmanned Aircraft Systems (ICUAS)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124732332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Cooperative localization based on the azimuth angles among multiple UAVs","authors":"Y. Qu, Jizhi Wu, Youmin Zhang","doi":"10.1109/ICUAS.2013.6564765","DOIUrl":"https://doi.org/10.1109/ICUAS.2013.6564765","url":null,"abstract":"In view of the potentials and benefits of using unmanned aerial vehicles (UAVs) in civil and surveillance applications, such as forest fire monitoring and fighting, earthquake and natural disasters monitoring and sensing etc., the cooperative flight of multiple UAVs has been paid more and more attention. Among the applications of multiple UAVs in cooperative flight, fault-tolerant cooperative localization against global positioning system (GPS) signal loss due to GPS receiver malfunction is one of key techniques for various practical applications. The current research on fault-tolerant cooperative localization of UAVs is mainly based on the distance between UAVs. However, cooperative localization based on the azimuth angles between UAVs has not been generally researched so far. This paper aims to solve the problem of fault-tolerant cooperative localization of UAVs by introducing the azimuth angles between UAVs. Firstly, the basic localization model is established and the formulas of localization in two and three dimensional coordinate systems are derived. Then the optimal reference planes are chosen with the principle of minimum horizontal dilution of positioning (HDOP). Kalman filter is applied to decrease the influence of observation errors on localization. Kalman filter and extended Kalman filter are designed against linear and non-linear systems, respectively. Finally, the simulation results indicate that the cooperative localization based on the azimuth angles achieves high localization accuracy.","PeriodicalId":322089,"journal":{"name":"2013 International Conference on Unmanned Aircraft Systems (ICUAS)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130513499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}