Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 15 of 15 for “"Safe Landing"”.
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Real-Time Realization of Lidar – Based Digital Surface Models for Airborne Safe Landing Zone Identification in Challenging Environments
… applications for real-time DSMs is aircraft landing, especially in a degraded visual environment. In such a challenging environment, no clear visual conditions exist, which can potentially result in the loss of equipment and/or life. These conditions can be caused by snow, rain, blowing sand …
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Real-time Evaluation of Vision-based Navigation for Autonomous Landing of a Rotorcraft Unmanned Aerial Vehicle in a Non-cooperative Environment
Landing a rotorcraft unmanned aerial vehicle (RUAV) without human supervision is a capability that would significantly broaden the usefulness of UAVs. The benefits are even greater if the functionality is expanded to involve landing sites with unknown terrain and a lack of GPS or other positioning …
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Method for Kalman Filtering Pose Estimates from Lidar Scans During the Landing Phase
… of Jupiter. The goal of this mission is to land safely on the unexplored rough terrain of the moon and analyze samples to detect the possibility of life in the subsurface oceans. A critical component to a safe landing is the ability to accurately estimate the state of the lander as it descends. …
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Vision-Based Control and Flight Optimization of a Rotorcraft UAV
… algorithm. The tracker uses the movement of the landing site in the camera, a laser range, and the aircraft attitude from an IMU to estimate the relative motion of the UAV. The position estimate functions as a GPS equivalent to enable the rotorcraft to maneuver without the aid of GPS. Flight …
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Mission design for safe traverse of planetary hoppers
… planetary surface mobility by reusing the landing platform and its actuators to propulsively ascend, translate, and descend to new landing points on the surface of a planetary body. Hoppers enhance regional exploration, with the capability of rapid traverse over hundreds to thousands of …
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An Open Source, Autonomous, Vision-Based Algorithm for Hazard Detection and Avoidance for Celestial Body Landing
… of our solar system. In order to provide a safe approach, several safety measures must be undertaken to guarantee not only the success of the mission but also the safety of the crew. One of these safety measures is the Autonomous Hazard, Detection, and Avoidance (HDA) sub-system for …
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An Integrated Platform to Increase the Range/Endurance of Unmanned Helicopters
… "eye in the sky" missions. However, an efficient landing/takeoff platform with refueling/recharging capabilities has not yet been developed to increase the endurance and decrease the cost for Class I helicopters.</p> <p>This dissertation presents a three-prong approach for increasing the range and …
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Design, manufacturing and testing of parachute recovery system for aludra SR-10 unmanned aerial vehicle (UAV)
… force at fourth time lower compared to belly landing, from 139.77 N to 30.81 N. The pilot-chute was successful pulled main parachute to free stream and fully inflated in a short time, less than 3 seconds. Most of all, the parachute recovery was able to support and bring the aircraft to a soft …
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Teaching Older Adults How to Fall Safely
… teach older adults movement strategies to fall safely. The purpose of the current study was to determine whether older adults can learn a safe falling-strategy (“tuck-and-roll”) to reduce the risk of fall- related injuries. Consistent with the principles of motor learning, learning was …
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On the feasibility of landing the dream chaser space vehicle in South Africa
… for the purpose of studying the feasibility of landing the Dream Chaser Space Vehicle on South African soil. The research dictates possibly having to establish a dualuse airport/spaceport recognised by the South African Space Council under supportive legislation to support this mission. Elements …
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An Iterative LQR Method for Addressing Model Uncertainty in the Mars Entry Problem
Since the moon landing in 1969 sounded the proverbial shotgun inciting efforts to expand the frontiers of space exploration, there has been unparalleled effort to enhance the technologies for doing so. While human presence in Earth orbit has boomed over the past decade, crewed planetary missions …
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Computer Vision Applications for Autonomous Aerial Vehicles
… link with the ground stations and data safety, UAVs are compelled to perform many tasks on their onboard embedded processing units, which makes it difficult to readily implement the most advanced algorithms on UAVs. This thesis focuses on computer vision and machine learning applications …
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Autonomous Landing of an Unmanned Aerial Vehicle on an Unmanned Surface Vessel using Model Predictive Control with an Adaptive-Covariance Extended Kalman Filter
… measurements of AprilTag markers on the USV landing platform. The AEKF employs an uncontrolled 6 degree-of-freedom nonlinear model augmented with second-order harmonic wave-induced motion dynamics. The AEKF implements two correction techniques: an adaptive covariance adjustment and an …
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Effectiveness of adaptive flight planning in the occurrence of total loss of thrust due to bird strike
… planner can significantly increase the odds of safe landing in the occurrence of total loss of thrust”. The objective is to test the research hypothesis through a designed experiment. To construct the experimental conditions, the FAA Wildlife Strike Database is statistically analyzed, and the …
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Characterization and Helicopter Flight Test of 3-D Imaging Flash LIDAR Technology for Safe, Autonomous, and Precise Planetary Landing
… and flight tested under the Autonomous Landing and Hazard Avoidance (ALHAT) project (in its fourth development and field test cycle) which is seeking to develop a guidance, navigation, and control (GNC) and sensing system based on lidar technology capable of enabling safe, precise …